2024/10/08 更新

写真a

カタオカ　ジュン
片岡　淳
News & Topics
所属
理工学術院 先進理工学部
職名
教授
学位
博士（理学） ( 東京大学 )
ホームページ
http://www.spxg-lab.phys.waseda.ac.jp/

経歴

  • 2021年10月
    -
    継続中

    JST 戦略的創造研究推進事業 ERATO   片岡ラインX線ガンマ線イメージング   研究総括

  • 2014年04月
    -
    継続中

    早稲田大学理工学術院 教授

  • 2017年04月
    -
    2019年03月

    JAXA宇宙機応用工学研究系 客員教授

  • 2009年04月
    -
    2014年03月

    早稲田大学理工学術院 准教授

  • 2006年04月
    -
    2010年03月

    JST 先端計測技術開発プログラム・プロジェクトリーダー

  • 2007年04月
    -
    2009年03月

    東京工業大学 大学院理工学研究科 助教

  • 2001年04月
    -
    2007年03月

    東京工業大学 大学院理工学研究科 助手

  • 2000年04月
    -
    2001年03月

    日本学術振興会 特別研究員(PD)

  • 1997年04月
    -
    2000年03月

    日本学術振興会 特別研究員(DC1)

▼全件表示

学歴

  • 1997年04月
    -
    2000年03月

    東京大学   大学院理学系研究科・物理学専攻  

  • 1995年04月
    -
    1997年03月

    東京大学   大学院理学系研究科・物理学専攻  

  • 1991年04月
    -
    1995年03月

    東京大学   理学部   物理学科  

委員歴

  • 2023年04月
    -
    継続中

    JST 先端国際共同研究推進事業  評価委員・専門アドバイザー

  • 2021年01月
    -
    2021年09月

    ノーベル物理学賞ノミネート委員 (2021)

  • 2013年
    -
    2014年

    宇宙線研究者会議CRC・将来計画検討小委員会メンバー（2013-2014年度）

  • 2012年01月
    -
    2012年09月

    ノーベル物理学賞ノミネート委員 (2012)

  • 2010年
    -
    2011年

    高エネルギー宇宙物理連絡会 運営委員 (2010-2011年度)

  • 2010年
    -
    2011年

    日本物理学会・宇宙線分科会・領域運営委員 (2010-2011年度)

  • 2010年
    -
    2011年

    応用物理学会・放射線分科会 幹事 (2010-2011年度)

  • 2010年
    -
    2011年

    日本学術振興会・特別研究員・面接委員 (2010－2011年度)

  • 2008年
    -
    　

    日本応用物理学会  正会員

  • 2007年01月
    -
    2007年09月

    ノーベル物理学賞ノミネート委員 (2007)

  • 1995年
    -
    　

    日本天文学会  正会員

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所属学協会

  • 　
    　
    　

    医学物理学会

  • 　
    　
    　

    日本天文学会

  • 　
    　
    　

    日本物理学会

  • 　
    　
    　

    日本応用物理学会

研究分野

  • 素粒子、原子核、宇宙線、宇宙物理に関する実験 / 天文学 / 医用システム / 放射線科学 / ナノバイオサイエンス / 量子ビーム科学

研究キーワード

  • 高エネルギー宇宙物理

  • 医学物理

  • 薬物伝達（ドラッグデリバリー）可視化システム

  • X線ガンマ線イメージング

  • 次世代放射線検出器開発

  • コンプトンカメラ

  • 多色スペクトラルCT

▼全件表示

受賞

  • 科学技術分野・文部科学大臣表彰 （研究部門）

    2024年04月  

  • 早稲田大学中核研究者

    2016年04月  

  • 第1回早稲田大学リサーチアワード（国際研究発信力）

    2014年12月  

  • 日本天文学会・欧文研究報告論文賞 （共著論文）

    2013年10月  

  • 科学技術分野・文部科学大臣表彰 （若手科学者賞）

    2012年04月  

  • 米国航空宇宙局・グループ研究賞

    2009年04月  

  • 日本天文学会・研究奨励賞

    2004年10月  

  • 日本物理学会・宇宙線物理学奨励賞

    2002年03月  

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メディア報道

  • 雷発生時のガンマ線、新潟十日町・松代で世界初の画像化に成功

    新聞・雑誌

    新潟日報（朝刊）  

    2022年12月

  • 早大ら、放射化イメージングで薬物動態の可視化へ

    インターネットメディア

    Optronics News Letter  

    2022年11月

  • 戦略的創造研究推進事業における 令和３年度新規研究総括および研究領域の決定について

    インターネットメディア

    2021年10月

  • Galaxy-Size Bubbles Discovered Towering Over the Milky Way

    新聞・雑誌

    Quanta Magagize  

    2021年01月

  • X線からガンマ線まで同時に可視化～早大・阪大が共同

    新聞・雑誌

    科学新聞  

    2020年10月

  • 輝くブラックホールの謎 ～ 銀河中心部繰り返し爆発か

    新聞・雑誌

    日本経済新聞（日刊）  

    2019年09月

  • 天の川銀河「巨大ガンマ線バブル」の謎に迫る

    academist Journal  

    2018年08月

  • 早大・東大・金沢大・理研、銀河中心「巨大ガンマ線バブル」の謎を解明 －1000万年前の大爆発をX線で検証

    日経新聞電子版  

    日経新聞電子版  

    2018年07月

  • 4.4MeVのガンマ線可視化 ― 早大が小型カメラ開発

    科学新聞  

    2018年06月

  • ガンマ線検出のカメラ～陽子線治療など応用 早大など開発

    日経産業新聞  

    2018年06月

  • 見えない光で未知を観る！

    BSジャパン   「科学ミチル 世界は未知で満ちている」  

    BSジャパン7ch : 木曜夜 8:55  

    2018年03月

  • 陽子線治療精度を向上 早大が体内進路可視化

    化学工業日報  

    2018年02月

  • 理系マイナビ 2019 SPECIAL INTERVIEW volume.51

    マイナビ  

    2017年12月

  • 研究者の横顔

    NTT   NTTファシリティーズ・ジャーナル  

    2017年11月

  • Medical gamma-ray camera is now palm-sized

    Science Daily  

    2017年05月

  • 世界最軽量５８０グラム実現 ガンマ線可視化カメラ

    科学新聞   科学新聞  

    2017年05月

  • 早大など、ガンマ線を3D画像に 手のひら大のカメラ

    日経新聞   日経新聞全国版  

    2017年05月

  • セシウムの分布可視化―早大、ドローン使い空撮

    日経産業新聞   日経産業新聞  

    2016年09月

  • 星空案内人 ― 福島で活躍中 コンプトンカメラ

    山形新聞   山形新聞  

    2016年07月

  • ガンマ線撮像用コンプトンカメラの高性能化に成功 ～除染のさらなる効率化、環境調査、医療、理学応用へ期待～

    静岡第一テレビ、日経産業新聞、日刊工業新聞  

    2014年07月

  • セシウム強度 効率測定～浜ホト・早大 ガンマ線カメラ

    新聞・雑誌

    日本経済新聞（日刊）  

    2013年09月

  • 数分で放射線画像化

    新聞・雑誌

    朝日新聞（日刊）  

    2013年09月

  • ガンマ線を素早く画像化－「福島第一」除染に威力

    新聞・雑誌

    中日新聞  

    2013年09月

  • 新種の「毒蜘蛛パルサー」発見

    読売新聞、東京新聞、中日新聞  

    2012年03月

  • Waseda University's Fermi LAT Team

    新聞・雑誌

    Fermi News Letter  

    2010年05月

  • フェルミ衛星で銀河に付随する「巨大な粒子雲」からのガンマ線を発見

    科学新聞  

    2010年04月

  • LuAG結晶用い放射線検出器開発ー次世代がん診断装置向け

    化学工業新聞  

    2009年07月

  • フェルミ衛星が新種のガンマ線銀河を発見

    毎日新聞  

    2009年06月

  • NASA’s Fermi Finds Gamma-Ray Galaxy Surprises

    インターネットメディア

    NASA  

    2009年05月

  • 解像度5倍 がん早期発見 ― 光センサー小さく

    新聞・雑誌

    日経産業新聞  

    2008年05月

▼全件表示

 

論文

  • Development of a single photon emission microscope system with ∼200 μm spatial resolution

    Seiichi Yamamoto, Kohei Nakanishi, Jun Kataoka

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1067   169673 - 169673  2024年10月

    DOI

    Scopus

  • Development of a phoswich imaging detector to simultaneously acquire neutron and gamma photon images

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Kei Kamada, Akira Yoshikawa, Hiroki Tanaka, Jun Kataoka

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1065   169484 - 169484  2024年08月

    DOI

    Scopus

  • Multi-energy in-vivo imaging of multiple contrast agents in a mouse using MPPC-based photon-counting CT

    Daichi Sato, Makoto Arimoto, Ayumi Ishiguro, Fitri Lucyana, Takahiro Tomoda, Kenichiro Okumura, Hiroki Kawashima, Satoshi Kobayashi, Kazuhiro Murakami, Jun Kataoka, Mayu Sagisaka, Shinsuke Terazawa, Satoshi Shiota

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1064   169337 - 169337  2024年07月

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • ComptonNet: A direct reconstruction model for Compton camera

    S. Sato, K. S. Tanaka, J. Kataoka

    Applied Physics Letters   124 ( 25 )  2024年06月

    　概要を見る

    A Compton camera is a gamma-ray imaging device, especially in the sub-mega-electron volt to higher than mega-electron volt range. Compton cameras have recently attracted attention as an environmental survey tool. However, owing to their limited sensitivity, Compton camera images often suffer from various artifacts, especially when the event statistics are low. To address this challenge, several deep learning models have been proposed to enhance the quality of reconstructed images with limited statistics. However, during the event selection phase of a typical Compton camera image reconstruction, a significant number of events that potentially reflect the source distribution are generally discarded. Effective utilization of these discarded events has the potential to estimate an accurate source distribution from limited statistical data. Thus, we initially developed ComptonNet-v1, a framework designed to directly estimate source distribution by integrating all measured events into a single model. To explicitly implement the difference in contribution between events that interact solely with scatterers, solely with absorbers, or with both, we developed ComptonNet-v2, which integrates these events individually. Consequently, our proposed models exhibited superior performance in both quantitative and qualitative assessments compared with existing models, even under low event statistics. In the future, we plan to implement a more memory-efficient model to estimate the distribution of complex source shapes.

    DOI

    Scopus

  • Experimental concept validation of a proton therapy range verification system using scattered proton measurements

    S. Sato, H. Yokokawa, M. Sagisaka, Y. Okazaki, R. Iwashita, S. Yoshida, K. S. Tanaka, S. Yamamoto, T. Yamashita, Y. Kobashi, J. Kataoka

    Applied Physics Letters   124 ( 21 )  2024年05月

    　概要を見る

    In recent years, the application of positron emission tomography (PET) for the dose range verification of proton therapy has been proposed. However, the positron distribution is determined by the nuclear reaction cross section; hence, PET may not accurately reflect the dose range primarily influenced by ionization. Consequently, a proton dose range verification system based on scattered proton measurements has been suggested owing to the similarity in the reaction cross section between Rutherford scattering and ionization. While previous investigations have only verified the feasibility of dose range estimation through simple simulations, the objective of this study is to demonstrate this feasibility through experimental investigation. In this paper, we established an experimental framework for capturing scattered protons and introduced an algorithm that compares measured signal patterns with a reference database to estimate the dose range. A therapeutic beam was irradiated onto the abdominal region of a human phantom, and scattered protons were measured using scintillation detectors placed on the phantom surface. Consequently, the dose range was estimated with error margins of 4.22 ± 3.68 and 0.60 ± 1.03 mm along the beam axis and perpendicular directions to the Bragg peak, respectively. While providing the same level of Bragg peak positioning accuracy as conventional methods, our system features small size, cost-effectiveness, and system simplicity. One notable limitation of our method is the challenge in achieving precise detector positioning, which is crucial for accurate dose range estimation. Future research will focus on improving detector-position accuracy and exploring advanced algorithms for signal analysis to further refine dose range estimations.

    DOI

    Scopus

  • Construction and initial performance evaluation of a newly developed plant PET system

    Seiichi Yamamoto, Hiroshi Watabe, Mitsutaka Yamaguchi, Nobuo Suzui, Naoki Kawachi, Jun Kataoka

    Journal of Instrumentation   19 ( 04 )  2024年04月  [査読有り]

    DOI

  • A method for estimating the incident directions of alpha particles in 2-dimensional trajectory images in a GAGG plate

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Journal of Instrumentation   19 ( 04 ) T04010 - T04010  2024年04月

    　概要を見る

    Abstract

    An imaging technique utilizing a scintillator plate in conjunction with a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera shows promise for capturing high-resolution trajectory images. Nevertheless, in the 2-dimensional trajectory images, the incident directions of the alpha particles entering the scintillator plate remained unknown due to the line-shaped trajectories. To elucidate the incident directions in our trajectory images, we conducted experiments capturing trajectory images of alpha particles under off-focus conditions. To capture off-focus images of alpha particles, we systematically varied the distance between the GAGG plate and the lens during imaging using an americium-241 (Am-241) source. Through images obtained at different distances between the GAGG plate and the lens, we successfully acquired trajectory images with varying degrees of off-focus, revealing that trajectory images focused on the upper surface of the GAGG plate exhibited blurred and wider trajectories in the deeper regions, making the incident directions of the alpha particles evident. We conclude that the proposed off-focus method for trajectory imaging of alpha particles holds promise for estimating the incident directions in the trajectory images.

    DOI

  • A novel method for efficiently measuring the non-proportionality of scintillators between light output and alpha particle energies from 1.8 MeV to 5.2 MeV

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Journal of Instrumentation   19 ( 04 ) P04011 - P04011  2024年04月

    　概要を見る

    Abstract

    It is known that scintillators exhibit non-proportional behavior between light output and the energy of gamma photons or beta particles. However, the non-proportionality between light output in scintillators and the energy of alpha particles has not been extensively measured, likely due to the challenges associated with preparing alpha particles with varying energies. To address this issue, we propose a novel method to modulate the energy of alpha particles using an americium-241 (Am-241) source covered with different numbers of Mylar films. By irradiating various scintillators, including GAGG, GGAG, YAP(Ce), and plastic scintillator, with alpha particles of different energies, we measured and evaluated the non-proportional response of these scintillators. We then compared the measured response as a function of incident energy to a simulation, which assumes a proportional response to evaluate the non-proportionality. For all the scintillators tested, non-proportionality was observed; the light output per MeV at 1.8 MeV ranged from 0.60 to 0.81 of the values observed at 5.2 MeV. The non-proportional response was largest for plastic scintillator (0.60) and smallest for GAGG (0.81). We conclude that the proposed method could be an efficient means of measuring the non-proportionality of scintillators between light output and alpha particle energies

    DOI

  • A triple-imaging-modality system for simultaneous measurements of prompt gamma photons, prompt x-rays, and induced positrons during proton beam irradiation

    Seiichi Yamamoto, Hiroshi Watabe, Kohei Nakanishi, Takuya Yabe, Mitsutaka Yamaguchi, Naoki Kawachi, Kei Kamada, Akira Yoshikawa, Masayasu Miyake, Kazuo S Tanaka, Jun Kataoka

    Physics in Medicine & Biology   69 ( 5 ) 055012 - 055012  2024年02月

    　概要を見る

    Abstract

    Objective. Prompt gamma photon, prompt x-ray, and induced positron imaging are possible methods for observing a proton beam’s shape from outside the subject. However, since these three types of images have not been measured simultaneously nor compared using the same subject, their advantages and disadvantages remain unknown for imaging beam shapes in therapy. To clarify these points, we developed a triple-imaging-modality system to simultaneously measure prompt gamma photons, prompt x-rays, and induced positrons during proton beam irradiation to a phantom. Approach. The developed triple-imaging-modality system consists of a gamma camera, an x-ray camera, and a dual-head positron emission tomography (PET) system. During 80 MeV proton beam irradiation to a polymethyl methacrylate (PMMA) phantom, imaging of prompt gamma photons was conducted by the developed gamma camera from one side of the phantom. Imaging of prompt x-rays was conducted by the developed x-ray camera from the other side. Induced positrons were measured by the developed dual-head PET system set on the upper and lower sides of the phantom. Main results. With the proposed triple-imaging-modality system, we could simultaneously image the prompt gamma photons and prompt x-rays during proton beam irradiation. Induced positron distributions could be measured after the irradiation by the PET system and the gamma camera. Among these imaging modalities, image quality was the best for the induced positrons measured by PET. The estimated ranges were actually similar to those imaged with prompt gamma photons, prompt x-rays and induced positrons measured by PET. Significance. The developed triple-imaging-modality system made possible to simultaneously measure the three different beam images. The system will contribute to increasing the data available for imaging in therapy and will contribute to better estimating the shapes or ranges of proton beam.

    DOI

    Scopus

  • Multi-pixel photon counter-based gamma camera with pinhole collimator to locate Cs-137 sources at high dose rates for the Fukushima nuclear power plant

    T. Tomoda, M. Arimoto, T. Mizuno, D. Sato, F. Lucyana, J. Kataoka, M. Kato, J. Ishii, T. Sawano, D. Yonetoku, S. Terazawa, S. Shiota

    Journal of Instrumentation   19 ( 2 )  2024年02月

    　概要を見る

    The Fukushima Daiichi Nuclear Power Plant was severely damaged during the 2011 Great East Japan Earthquake. However, the ongoing decommissioning work has been limited by the complexity of the reactor’s internal structure and very high radiation levels; locating radioactive sources is essential for efficient decommissioning. Conventional gamma cameras are mainly designed for low radiation dose (∼mSv/h) and using them under high radiation conditions is difficult (>Sv/h). Therefore, we developed a pinhole gamma camera with a gamma radiation detector consisting of a high-speed YGAG scintillator array and multi-pixel photon counters to locate radioactive sources at high dose rates. The gamma-ray photon signals captured by the developed two-dimensional detector array can be processed at a speed as high as >1 MHz/pixel using the developed large scale integrated circuit. Herein, we report the measurement results of an extremely high radioactivity of137Cs (∼34 TBq) using the developed gamma camera. The gamma-ray source position was determined using an angular size of ∼4.6◦, with images obtained at 2 m from the radioactive source and at a dose rate of 0.3 Sv/h. The direct gamma rays with a photoelectric peak at 662 keV and scattered component of gamma rays can be distinguished from the measured spectrum. We also characterize the imaging capability of the137Cs depending on the detected gamma-ray energies and discuss related details.

    DOI

    Scopus

  • Sparse-view image reconstruction with total-variation minimization applied to sparsely sampled projection data from SiPM-based photon-counting CT

    D. Sato, M. Arimoto, J. Kotoku, H. Kawashima, S. Kobayashi, K. Okumura, K. Murakami, F. Lucyana, T. Tomoda, J. Kataoka, M. Sagisaka, S. Terazawa, S. Shiota

    Journal of Instrumentation   19 ( 02 ) C02010 - C02010  2024年02月  [査読有り]

    　概要を見る

    Abstract

    We constructed a sparse-view computed tomography (CT) system that combines a compressed sensing (CS)-based image-reconstruction algorithm and SiPM-based photon-counting (PC) CT. CS-based image-reconstruction algorithms have been extensively studied for X-ray CT image reconstruction using fewer projections because they are expected to reduce CT imaging time and radiation exposure while maintaining CT image quality. In most previous studies, CS-based image-reconstruction algorithms have been applied to data obtained through numerical simulations or conventional dual-energy CT. However, studies on PC-CT have been scarce. Therefore, we applied a CS-based image-reconstruction algorithm to the projection data obtained using our previously established SiPM-based PC-CT system and evaluated its image quality. We prepared static phantoms equivalent to iodine-containing contrast agents and a mouse model injected with iodine-containing contrast agents as subjects. Thereafter, CT scanning was performed. The obtained projection data were downsampled to simulate a sparse-view situation, and a CS-based image-reconstruction algorithm with total-variation minimization was applied. Consequently, sparse-view CT images were successfully reconstructed, and the image quality was maintained even after downsampling the projection data (downsampling ratios of 1/10 and 1/2 for the rod phantom and mouse model, respectively). Thus, the imaging time and exposure dose could be remarkably reduced (by a factor of 10 or 2), indicating that the CS-based image-reconstruction algorithm is effective for PC-CT.

    DOI

  • Range and light output measurements of trajectory images in a GAGG plate with different alpha particle energies

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Journal of Instrumentation   19 ( 01 ) P01010 - P01010  2024年01月

    　概要を見る

    Abstract

    An imaging method that utilizes a scintillator plate combined with a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera shows promise for obtaining high-resolution trajectory images. However, it is not yet clear whether the ranges of the trajectory images change with the energy of the alpha particles. Additionally, it remains unclear whether the intensity of the trajectory images is affected by the energy of the alpha particles. To address these questions in our trajectory imaging research, we conducted experiments to capture trajectory images of alpha particles with varying energy levels. To generate alpha particles with different energies, we modulated the energy using an americium-241 (Am-241) source covered with varying numbers of Mylar films. With this alpha source and imaging system, we successfully captured trajectory images with different alpha particle energies and were able to assess the ranges and intensities of these trajectories at various energy levels. The estimated ranges from the measured images with different alpha particle energies closely matched the results obtained through simulations. However, it's worth noting that the light output, as evaluated for the measured trajectory images, was slightly lower than the simulated results at lower energy levels probably due to the non-proportionality of the GAGG plate with respect to alpha particle energies.

    DOI

  • A large field-of-view angled panel detector for the development of a plant PET system

    Seiichi Yamamoto, Hiroshi Watabe, Mitsutaka Yamaguchi, Nobuo Suzui, Naoki Kawachi, Jun Kataoka

    Journal of Instrumentation   19 ( 1 ) T01002  2024年01月  [査読有り]

    　概要を見る

    <jats:title>Abstract</jats:title>
    <jats:p>In plant research, positron emission tomography (PET) is
    sometimes employed for physiological studies of plants. However, due
    to the generally high cost of PET systems, their application in
    plant research centers can be challenging. Furthermore, the
    configurations of commercial PET systems might not always align well
    with the requirements of plant research. To address these issues, we
    have taken the initial steps towards a solution by developing a
    large field-of-view (LFOV) angled panel detector intended for the
    development of a plant PET system. This panel detector is composed
    of two gadolinium orthosilicate (GSO) scintillator blocks, an angled
    light guide, and four flat panel photomultiplier tubes
    (FP-PMTs). The GSO pixel size used in the scintillator block
    measures
    2.65 mm (radial)× 2.85 mm (axial)×
    15.0 mm, arranged in a configuration of
    16 (radial)× 32 (axial) to form a scintillator
    block with overall dimensions of
    44.0 mm (radial)× 94.4 mm (axial)×
    15 mm (depth). By implementing an angled light guide, the
    two scintillator blocks were positioned at a 22.5-degree angle,
    resulting in the creation of a LFOV angled panel detector. This
    specific angle allowed for the arrangement of 16 scintillator blocks
    in a hexadecagonal shape using 8 panel detectors when arranged in a
    circular configuration. We successfully constructed a panel detector
    with an approximate field-of-view of 10 cm× 10 cm
    and conducted a comprehensive performance evaluation. Upon
    irradiating the panel detector with 511 keV gamma photons, nearly
    all 1024 GSO pixels were accurately resolved in the position
    histogram, displaying minimal distortion, and exhibiting an average
    peak-to-valley ratio of 5.0. Additionally, the energy resolution
    achieved was 14% full width at half maximum (FWHM). The resulting
    LFOV angled panel detector holds considerable promise for the use
    within a cost-effective, user-friendly as well as high performance
    plant PET system.</jats:p>

    DOI

  • Optimization of a YAP(Ce) prompt X-ray camera for imaging with spot scanning proton beams at clinical dose levels

    Seiichi Yamamoto, Tomohiro Yamashita, Yusuke Kobashi, Takuya Yabe, Takashi Akagi, Mitsutaka Yamaguchi, Naoki Kawachi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Journal of Instrumentation   18 ( 12 )  2023年12月

    　概要を見る

    Prompt secondary electron bremsstrahlung X-ray (prompt X-ray) imaging using a low-energy X-ray camera is a promising method for observing the beam shape from outside a subject. However, it has sometimes been necessary to conduct such imaging at a higher dose than the clinical level to acquire images with acceptable quality. To solve this problem, we optimized a prompt X-ray imaging system to use for spot scanning proton therapy system. The new camera had more than one order higher sensitivity to image several types of beams, including those at the clinical dose level. The optimized prompt X-ray imaging system uses a 4 mm diameter pinhole collimator to increase sensitivity, and it is combined with a larger YAP(Ce) scintillator to increase the magnification ratio and thus improve spatial resolution. We used a list-mode data-acquisition system with high count rate capability. Prompt X-ray images were acquired by irradiating a water phantom with proton beams from the spot scanning proton therapy system. Measurements were taken for pencil beams, spread-out Bragg peak (SOBP) beams, and a beam utilized in actual clinical therapy. For all of the beams, we could measure scanning spot images within a spill and evaluate the ranges for the accumulated images at the clinical dose level. From the list-mode data, we measured the temporarily altered positions of the scanning beams as well as the accumulations of the prompt X-ray images. The optimized prompt X-ray imaging system could improve sensitivity while maintaining better spatial resolution. The new system realized prompt X-ray imaging at the clinical dose level and holds promise for future clinical imaging of prompt X-rays.

    DOI

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  • A comparative study of EM-CCD and CMOS cameras for particle ion trajectory imaging

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Katsunori Yogo, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Applied Radiation and Isotopes     111143 - 111143  2023年12月

    DOI

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    1
    被引用数
    (Scopus)

  • The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars

    D. A. Smith, S. Abdollahi, M. Ajello, M. Bailes, L. Baldini, J. Ballet, M. G. Baring, C. Bassa, J. Becerra Gonzalez, R. Bellazzini, A. Berretta, B. Bhattacharyya, E. Bissaldi, R. Bonino, E. Bottacini, J. Bregeon, P. Bruel, M. Burgay, T. H. Burnett, R. A. Cameron, F. Camilo, R. Caputo, P. A. Caraveo, E. Cavazzuti, G. Chiaro, S. Ciprini, C. J. Clark, I. Cognard, A. Corongiu, P. Cristarella Orestano, M. Crnogorcevic, A. Cuoco, S. Cutini, F. D’Ammando, A. de Angelis, M. E. DeCesar, S. De Gaetano, R. de Menezes, J. Deneva, F. de Palma, N. Di Lalla, F. Dirirsa, L. Di Venere, A. Domínguez, D. Dumora, S. J. Fegan, E. C. Ferrara, A. Fiori, H. Fleischhack, C. Flynn, A. Franckowiak, P. C. C. Freire, Y. Fukazawa, P. Fusco, G. Galanti, V. Gammaldi, F. Gargano, D. Gasparrini, F. Giacchino, N. Giglietto, F. Giordano, M. Giroletti, D. Green, I. A. Grenier, L. Guillemot, S. Guiriec, M. Gustafsson, A. K. Harding, E. Hays, J. W. Hewitt, D. Horan, X. Hou, F. Jankowski, R. P. Johnson, T. J. Johnson, S. Johnston, J. Kataoka, M. J. Keith, M. Kerr, M. Kramer, M. Kuss, L. Latronico, S.-H. Lee, D. Li, J. Li, B. Limyansky, F. Longo, F. Loparco, L. Lorusso, M. N. Lovellette, M. Lower, P. Lubrano, A. G. Lyne, Y. Maan, S. Maldera, R. N. Manchester, A. Manfreda, M. Marelli, G. Martí-Devesa, M. N. Mazziotta, J. E. McEnery, I. Mereu, P. F. Michelson, M. Mickaliger, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, M. Negro, R. Nemmen, L. Nieder, E. Nuss, N. Omodei, M. Orienti, E. Orlando, J. F. Ormes, M. Palatiello, D. Paneque, G. Panzarini, A. Parthasarathy, M. Persic, M. Pesce-Rollins, R. Pillera, H. Poon, T. A. Porter, A. Possenti, G. Principe, S. Rainò, R. Rando, S. M. Ransom, P. S. Ray, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, N. Renault-Tinacci, R. W. Romani, M. Sánchez-Conde, P. M. Saz Parkinson, L. Scotton, D. Serini, C. Sgrò, R. Shannon, V. Sharma, Z. Shen, E. J. Siskind, G. Spandre, P. Spinelli, B. W. Stappers, T. E. Stephens, D. J. Suson, S. Tabassum, H. Tajima, D. Tak, G. Theureau, D. J. Thompson, O. Tibolla, D. F. Torres, J. Valverde, C. Venter, Z. Wadiasingh, N. Wang, N. Wang, P. Wang, P. Weltevrede, K. Wood, J. Yan, G. Zaharijas, C. Zhang, W. Zhu

    The Astrophysical Journal   958 ( 2 ) 191 - 191  2023年11月

    　概要を見る

    Abstract

    We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio searches of LAT sources will likely reveal pulsations once phase-connected rotation ephemerides are achieved. A further dozen optical and/or X-ray binary systems colocated with LAT sources also likely harbor gamma-ray MSPs. This catalog thus reports roughly 340 gamma-ray pulsars and candidates, 10% of all known pulsars, compared to ≤11 known before Fermi. Half of the gamma-ray pulsars are young. Of these, the half that are undetected in radio have a broader Galactic latitude distribution than the young radio-loud pulsars. The others are MSPs, with six undetected in radio. Overall, ≥236 are bright enough above 50 MeV to fit the pulse profile, the energy spectrum, or both. For the common two-peaked profiles, the gamma-ray peak closest to the magnetic pole crossing generally has a softer spectrum. The spectral energy distributions tend to narrow as the spindown power $\dot{E}$ decreases to its observed minimum near 1033 erg s−1, approaching the shape for synchrotron radiation from monoenergetic electrons. We calculate gamma-ray luminosities when distances are available. Our all-sky gamma-ray sensitivity map is useful for population syntheses. The electronic catalog version provides gamma-ray pulsar ephemerides, properties, and fit results to guide and be compared with modeling results.

    DOI

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    被引用数
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  • Estimating blurless and noise-free Ir-192 source images from gamma camera images for high-dose-rate brachytherapy using a deep-learning approach

    Kohei Nakanishi, Seiichi Yamamoto, Takuya Yabe, Katsunori Yogo, Yumiko Noguchi, Kuniyasu Okudaira, Naoki Kawachi, Jun Kataoka

    Biomedical Physics &amp; Engineering Express    2023年11月

    　概要を見る

    Abstract

    Objective: Precise monitoring of the position and dwell time of iridium-192 (Ir-192) during high-dose-rate (HDR) brachytherapy is crucial to avoid serious damage to normal tissues. Source imaging using a compact gamma camera is a potential approach for monitoring. However, images from the gamma camera are affected by blurring and statistical noise, which impact the accuracy of source position monitoring. This study aimed to develop a deep-learning approach for estimating ideal source images that reduce the effect of blurring and statistical noise from experimental images captured using a compact gamma camera.&amp;#xD;Approach: A double pix2pix model was trained using the simulated gamma camera images of an Ir-192 source. The first model was responsible for denoising the Ir-192 images, whereas the second model performed super resolution. Trained models were then applied to the experimental images to estimate the ideal images. &amp;#xD;Main results: At a distance of 100 mm between the compact gamma camera and the Ir-192 source, the difference in full width at half maximum (FWHM) between the estimated and actual source sizes was approximately 0.5 mm for a measurement time of 1.5 s. This difference has been improved from approximately 2.7 mm without the use of DL. Even with a measurement time of 0.1 s, the ideal images could be estimated as accurately as in the 1.5 s measurements. This method consistently achieved accurate estimations of the source images at any position within the field of view; however, the difference increased with the distance between the Ir-192 source and the compact gamma camera.&amp;#xD;Significance: The proposed method successfully provided estimated images from the experimental images within errors smaller than 0.5 mm at 100 mm. This method is promising for reducing blurring and statistical noise from the experimental images, enabling precise real-time monitoring of Ir-192 sources during HDR brachytherapy.

    DOI

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    2
    被引用数
    (Scopus)

  • Direct Measurement of the Spectral Structure of Cosmic-Ray <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Electrons</mml:mtext><mml:mo>+</mml:mo><mml:mtext>Positrons</mml:mtext></mml:mrow></mml:math> in the TeV Region with CALET on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   131 ( 19 )  2023年11月

    DOI

  • Development of an event-by-event based Li–ZnS(Ag) neutron imaging detector with selective neutron detection capability

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Kei Kamada, Akira Yoshikawa, Hiroki Tanaka, Jun Kataoka

    Applied Radiation and Isotopes     111084 - 111084  2023年10月

    DOI

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  • Sub-micrometer real-time imaging of trajectory of alpha particles using GAGG plate and CMOS camera

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Katsunori Yogo, Kei Kamada, Akira Yoshikawa, Nanase Koshikawa, Jun Kataoka

    Journal of Instrumentation   18 ( 10 ) T10003 - T10003  2023年10月

    　概要を見る

    Abstract

    High-resolution and real-time imaging of the trajectories of alpha particles is desired in nuclear medicine and nuclear engineering. Although an imaging method using a scintillator plate combined with a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera is a possible method of obtaining high-resolution trajectory images, the spatial resolution of the system is limited to ∼2 μm. To overcome the spatial resolution limitations of this method on trajectory imaging, we used a cooled complementally metal oxide (CMOS) camera in which the sensor had a much larger number of pixels, which were also smaller. Using the CMOS camera based imaging system, we could measure the trajectories of alpha particles in real time with the spatial resolution of 0.34 μm FWHM. With smoothing of the images to reduce image noise, spatial resolution was still kept to less than 0.75 μm. We conclude that this CMOS camera-based alpha-particle trajectory-imaging system is promising for alpha-particle or other particles imaging where ultrahigh spatial resolution is required.

    DOI

  • Ultrahigh resolution real-time trajectory imaging of neutron induced particles in a scintillator from lithium-6 plate

    Yamamoto Seiichi, Yoshino Masao, Nakanishi Kohei, Kamada Kei, Yoshikawa Akira, Kataoka Jun

    Journal of Instrumentation   18 ( 10 ) T10002 - T10002  2023年10月

    　概要を見る

    Abstract

    It is known that a lithium-6 (6Li) absorbs a neutron and is divided into a triton and an alpha particle. However, the trajectories of the produced tritons have not yet been imaged in real time and high resolution. We developed an ultrahigh-resolution imaging system that can clearly observe the trajectories of neutron induced particles in real time. The developed system is based on a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera combined with a 6Li plate and a Ce-doped Gd3Al2Ga3O12(GAGG) scintillator plate. Neutrons from a californium-252 (252Cf) source were irradiated to the 6Li plate, which produced tritons and alpha particles. The produced tritons or alpha particles entered the GAGG plate and produced scintillation light along the trajectories. The scintillation trajectories were magnified by the unit, light intensified, and imaged by the EM-CCD camera. Using our system, we could measure the elongated trajectory images of the particles in real time. Most of these trajectories had Bragg peak like shapes in the images. The average range was 15 μm and the width was 4.6 μm FWHM. From the ranges we estimated, we found that these trajectories could be attributed to the induced tritons. Consequently, the developed real time imaging system is promising for research on the ultrahigh resolution imaging of neutron produced particles.

    DOI

  • Erratum: Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station [Phys. Rev. Lett. 130, 211001 (2023)

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical review letters   131 ( 10 ) 109902  2023年09月

    　概要を見る

    This corrects the article DOI: 10.1103/PhysRevLett.130.211001.

    DOI PubMed

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  • The cosmic-ray electron and positron spectrum measured with CALET on the International Space Station

    Yosui Akaike, Oscar Adriani, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

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  • Results from CALorimetric Electron Telescope (CALET) Observations of Gamma-rays on the International Space Station

    Masaki Mori, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

    DOI

  • Optimization of the proton background rejection in the measurement of the electron flux at high energies with CALET on the International Space Station

    Sandro Gonzi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

    DOI

  • Results of the Ultra-Heavy Cosmic-Ray Analysis with CALET on the International Space Station

    Wolfgang V Zober, Brian Flint Rauch, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

    DOI

  • Feasibility study on an analysis of CR helium flux with the CALET detector based on an extended acceptance

    Marco Mattiazzi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

    DOI

  • Dark Matter Limits from the CALET Electron+Positron Spectrum with Individual Astrophysical Source Background

    Holger Motz, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

    DOI

  • Interpretation of the CALET Electron+Positron Spectrum by Astrophysical Sources

    Holger Motz, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

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  • Cosmic-Ray Modulation during Solar Cycles 24-25 Transition Observed with CALET on the International Space Station

    Shoko Miyake, Oscar Adriani, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober, Kazuoki Munakata, Yosui Akaike

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

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  • Observation of spectral structures in the flux of cosmic ray protons with CALET on the International Space Station

    Kazuyoshi Kobayashi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

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  • CALET Search for electromagnetic counterparts of gravitational waves in O4

    Yuta Kawakubo, Michael L. Cherry, Takanori Sakamoto, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

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  • Flux ratios of primary elements measured by CALET on the International Space Station

    Caterina Checchia, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

    DOI

  • Iron and Nickel fluxes measured by CALET on the International Space Station

    Francesco Stolzi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年08月

    DOI

  • Luminescence imaging of water irradiated by protons under FLASH radiation therapy conditions.

    Katsunori Yogo, Satoshi Kodaira, Tamon Kusumoto, Hisashi Kitamura, Toshiyuki Toshito, Hiromitsu Iwata, Masumi Umezawa, Masashi Yamada, Takuto Miyoshi, Masataka Komori, Hiroshi Yasuda, Jun Kataoka, Seiichi Yamamoto

    Physics in medicine and biology   68 ( 15 )  2023年07月  [査読有り]  [国際誌]

    　概要を見る

    Objective.FLASH radiation therapy with ultrahigh dose rates (UHDR) has the potential to reduce damage to normal tissue while maintaining anti-tumor efficacy. However, rapid and precise dose distribution measurements remain difficult for FLASH radiation therapy with proton beams. To solve this problem, we performed luminescence imaging of water following irradiation by a UHDR proton beam captured using a charge-coupled device camera.Approach. We used 60 MeV proton beams with dose rates of 0.03-837 Gy s-1from a cyclotron. Therapeutic 139.3 MeV proton beams with dose rates of 0.45-4320 Gy s-1delivered by a synchrotron-based proton therapy system were also tested. The luminescent light intensity induced by the UHDR beams was compared with that produced by conventional beams to compare the dose rate dependency of the light intensity and its profile.Main results. Luminescence images of water were clearly visualized under UHDR conditions, with significantly shorter exposure times than those with conventional beams. The light intensity was linearly proportional to the delivered dose, which is similar to that of conventional beams. No significant dose-rate dependency was observed for 0.03-837 Gy s-1. The light-intensity profiles of the UHDR beams agreed with those of conventional beams. The results did not differ between accelerators (synchrotron or cyclotron) and beam energies.Significance. Luminescence imaging of water is achievable with UHDR proton beams as well as with conventional beams. The proposed method should be suitable for rapid and easy quality assurance investigations for proton FLASH therapy, because it facilitates real-time, filmless measurements of dose distributions, and is useful for rapid feedback.

    DOI PubMed

    Scopus

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    被引用数
    (Scopus)

  • Refinement of the High-Energy Gamma-ray Selection for CALET on the International Space Station

    Nicholas W Cannady, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

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  • Statistical analysis into the drivers behind relativistic electron precipitation events observed by CALET on the International Space Station

    Anthony Ficklin, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

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  • Status of the operations of CALET for 7.5 years on the International Space Station

    Tadahisa Tamura, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

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  • Observational Challenges on the ISS: A Case Study with CALET

    Nicholas W Cannady, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

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  • Event-by-Event Analysis for TeV Electron Candidates with CALET on the International Space Station

    Nicholas W Cannady, Yosui Akaike, Shoji Torii, Oscar Adriani, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

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  • Boron flux in cosmic rays and its flux ratio to primary species measured with CALET on the International Space Station

    Paolo Maestro, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

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  • Measurement of iron cosmic-ray primaries below 10 GeV/n by use of the geomagnetic effect with CALET

    Masakatsu Ichimura, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

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  • Helium flux and its ratio to proton flux in cosmic rays measured with CALET on the International Space Station

    Paolo Brogi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023年07月

    DOI

  • Citizen Science Observation of a Gamma‐Ray Glow Associated With the Initiation of a Lightning Flash

    M. Tsurumi, T. Enoto, Y. Ikkatai, T. Wu, D. Wang, T. Shinoda, K. Nakazawa, N. Tsuji, G. S. Diniz, J. Kataoka, N. Koshikawa, R. Iwashita, M. Kamogawa, T. Takagaki, S. Miyake, D. Tomioka, T. Morimoto, Y. Nakamura, H. Tsuchiya

    Geophysical Research Letters   50 ( 13 )  2023年07月

    DOI

  • Simultaneous imaging of luminescence and prompt x-rays during irradiation with spot-scanning proton beams at clinical dose level.

    Seiichi Yamamoto, Tomohiro Yamashita, Yusuke Kobashi, Takuya Yabe, Takashi Akagi, Mitsutaka Yamaguchi, Naoki Kawachi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Biomedical physics & engineering express   9 ( 4 )  2023年06月  [国際誌]

    　概要を見る

    Prompt x-ray imaging is a promising method for observing the beam shape from outside a subject. However, its distribution is different from dose distribution, and thus a comparison with the dose is required. Meanwhile, luminescence imaging of water is a possible method for imaging the dose distribution. Consequently, we performed simultaneous imaging of luminescence and prompt x-rays during irradiation by proton beams to compare the distributions between these two different imaging methods. Optical imaging of water was conducted with spot-scanning proton beams at clinical dose level during irradiation to a fluorescein (FS) water phantom set in a black box. Prompt x-ray imaging was also conducted simultaneously from outside the black box using a developed x-ray camera during proton beam irradiation to the phantom. We measured images of the luminescence of FS water and prompt x-rays for various types of proton beams, including pencil beams, spread-out Bragg peak (SOBP) beams, and clinically used therapy beams. After the imaging, ranges were estimated from FS water and prompt x-rays and compared with those calculated with a treatment planning system (TPS). We could measure the prompt x-ray and FS water images simultaneously for all types of proton beams. The ranges estimated from the FS water and those calculated with the TPS closely matched, within a difference of several mm. Similar range difference was found between the results estimated from prompt x-ray images and those calculated with the TPS. We confirmed that the simultaneous imaging of luminescence and prompt x-rays were possible during irradiation with spot-scanning proton beams at a clinical dose level. This method can be applied to range estimation as well as comparison with the dose for prompt x-ray imaging or other imaging methods used in therapy with various types of proton beams at a clinical dose level.

    DOI PubMed

    Scopus

  • A high-resolution real-time imaging system for observing the trajectories of neutron induced particles in a scintillator

    Seiichi Yamamoto, Masao Yoshino, Kohei Nakanishi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Journal of Instrumentation   18 ( 06 ) T06009 - T06009  2023年06月

    　概要を見る

    Abstract

    High-resolution imaging of neutron induced particles is required in such methods as neutron radiography. However, the scintillation spots in a neutron-sensitive scintillator have not yet been imaged nor measured for size. We developed a high-resolution, real-time neutron induced particle imaging system for observing these particles' trajectories in a scintillator. The developed system is based on a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera combined with a lithium-containing silver-doped zinc sulfide (Li-ZnS(Ag)) scintillator plate. Neutrons from a californium-252 (252Cf) source were irradiated to the Li-ZnS(Ag) scintillator and imaged with the system. Using our system, we measured the scintillation spots of the neutron induced particles having different shapes in real time. In some of these measured scintillation spots, those with elliptical shapes were observed due to the trajectories of the particles in the scintillator. The spatial resolution calculated from the widths of the scintillation spots was ∼56 μm. Consequently, the developed imaging system is promising for research on neutron imaging that requires high spatial resolution.

    DOI

  • Hybrid imaging of prompt x-rays and induced positrons using a pinhole gamma camera during and after irradiation of protons.

    Seiichi Yamamoto, Hiroshi Watabe, Kohei Nakanishi, Takuya Yabe, Mitsutaka Yamaguchi, Naoki Kawachi, Kei Kamada, Akira Yoshikawa, Md Rafiqul Islam, Masayasu Miyake, Kazuo S Tanaka, Jun Kataoka

    Physics in medicine and biology   68 ( 11 )  2023年05月  [国際誌]

    　概要を見る

    Objective. Prompt x-ray imaging using a low-energy x-ray camera is a promising method for observing a proton beam's shape from outside the subject. Furthermore, imaging of positrons produced by nuclear reactions with protons is a possible method for observing the beam shape. However, it has not been possible to measure these two types of images with a single imaging system due to the limited imaging capability of existing systems. Imaging of both prompt x-rays and the distribution of positrons may compensate for the shortcomings of each method.Approach. We conducted imaging of the prompt x-ray using a pinhole x-ray camera during irradiation with protons in list mode. Then, after irradiation with protons, imaging of annihilation radiations from the produced positrons was conducted using the same pinhole x-ray camera in list mode. After this imaging, list-mode data were sorted to obtain prompt x-ray images and positron images.Main results. With the proposed procedure, we could measure both prompt x-ray images and induced positron images with a single irradiation by a proton beam. From the prompt x-ray images, ranges and widths of the proton beams could be estimated. The distributions of positrons were slightly wider than those of the prompt x-rays. From the time sequential positron images, we could derive the time activity curves of the produced positrons.Significance. Hybrid imaging of prompt x-rays and induced positrons using a pinhole x-ray camera was achieved. The proposed procedure would be useful for measuring prompt x-ray images during irradiation to estimate the beam structures as well as for measuring the induced positron images after irradiation to estimate the distributions and time activity curves of the induced positrons.

    DOI PubMed

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    1
    被引用数
    (Scopus)

  • Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   130 ( 21 )  2023年05月

    DOI

  • Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   130 ( 17 )  2023年04月

    DOI

  • Development of an ultrahigh resolution real time alpha particle imaging system for observing the trajectories of alpha particles in a scintillator

    Seiichi Yamamoto, Masao Yoshino, Kei Kamada, Ryuga Yajima, Akira Yoshikawa, Kohei Nakanishi, Jun Kataoka

    Scientific Reports   13 ( 1 )  2023年04月  [査読有り]

    　概要を見る

    Abstract

    High-resolution imaging of alpha particles is required in the detection of alpha radionuclides in cells or small organs for the development of radio-compounds for targeted alpha-particle therapy or other purposes. We developed an ultrahigh resolution, real time alpha-particle imaging system for observing the trajectories of alpha particles in a scintillator. The developed system is based on a magnifying unit and a cooled electron multiplying charge-coupled device (EM-CCD) camera, combined with a 100-µm-thick Ce-doped Gd3Al2Ga3O12 (GAGG) scintillator plate. Alpha particles from an Am-241 source were irradiated to the GAGG scintillator and imaged with the system. Using our system, we measured the trajectories of the alpha particles having different shapes in real time. In some of these measured trajectories, the line shapes of the alpha particles that flew in the GAGG scintillator were clearly observed. The lateral profiles of the alpha-particle trajectories were imaged with widths of ~ 2 µm. We conclude that the developed imaging system is promising for research on targeted alpha-particle therapy or other alpha particle detections that require high spatial resolution.

    DOI

    Scopus

    6
    被引用数
    (Scopus)

  • Prompt X-ray imaging during irradiation with spread-out Bragg peak (SOBP) beams of carbon ions.

    Seiichi Yamamoto, Takuya Yabe, Takashi Akagi, Mitsutaka Yamaguchi, Naoki Kawachi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)   109   102592 - 102592  2023年04月  [国際誌]

    　概要を見る

    Prompt secondary electron bremsstrahlung X-ray (prompt X-ray) imaging using a low-energy X-ray camera is a promising method for observing a beam shape from outside the subject. However, such imaging has so far been conducted only for pencil beams without a multi-leaf collimator (MLC). The use of spread-out Bragg peak (SOBP) with an MLC may increase the scattered prompt gamma photons and decrease the contrast of the images of prompt X-rays. Consequently, we performed prompt X-ray imaging of SOBP beams formed with an MLC. This imaging was carried out in list mode during irradiation of SOBP beams to a water phantom. An X-ray camera with a 1.5-mm diameter as well as 4-mm-diameter pinhole collimators was used for the imaging. List mode data were sorted to obtain the SOBP beam images as well as energy spectra and time count rate curves. Due to the high background counts from the scattered prompt gamma photons penetrating the tungsten shield of the X-ray camera, the SOBP beam shapes were difficult to observe with a 1.5-mm-diameter pinhole collimator. With the 4-mm-diameter pinhole collimators, images of SOBP beam shapes at clinical dose levels could be obtained with the X-ray camera. The use of a 4-mm-diameter pinhole collimator attached to the X-ray camera is effective for prompt X-ray imaging with high sensitivity and low background counts. This approach makes it possible to image SOBP beams with an MLC when the counts are low and the background levels are high.

    DOI PubMed

    Scopus

    2
    被引用数
    (Scopus)

  • Development of a list-mode data acquisition system for prompt X-ray imaging during irradiation with carbon-ions

    Seiichi Yamamoto, Takuya Yabe, Takashi Akagi, Mitsutaka Yamaguchi, Naoki Kawachi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Journal of Instrumentation   18 ( 4 )  2023年04月

    　概要を見る

    Prompt X-ray imaging using a low-energy X-ray camera is a promising method for observing the beam shape from outside the subject. However, such imaging has so far been conducted only on static images with relatively long acquisition times without any energy information. Consequently, we performed list-mode prompt X-ray imaging using a newly developed data acquisition system combined with a pinhole YAP(Ce) camera during irradiation of a water phantom with carbon ions. Prompt X-ray imaging was conducted in list mode with a 1-ms time stamp and 128-channel energy bins during irradiation of a water phantom with 241.5 MeV/n carbon ions. After the imaging, list-mode data were sorted to obtain the time-sequential prompt X-ray images and those with different energies. From the images with different energies, we found the energy spectra were different depending on the areas in the images, and the reduction of the background fraction was possible. From the short time-sequential prompt X-ray images, we could even observe the differences in the images depending on the acquisition times, as well as the spill and ripple shapes of the carbon ion beam.

    DOI

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  • Initial results of in vivo CT imaging of contrast agents using MPPC-based photon-counting CT

    Daichi Sato, Makoto Arimoto, Kotaro Yoshiura, Tomoya Mizuno, Ko Aiga, Kairi Ishiguro, Takahiro Tomoda, Hiroki Kawashima, Satoshi Kobayashi, Kenichiro Okumura, Kazuhiro Murakami, Jun Kataoka, Takaya Toyoda, Mayu Sagisaka, Shinsuke Terazawa, Satoshi Shiota

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1048   167960 - 167960  2023年03月

    DOI

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    7
    被引用数
    (Scopus)

  • Development and x-ray imaging performance of Tb-doped GdAlO<inf>3</inf>- α Al<inf>2</inf>O<inf>3</inf>submicron-diameter phase-separated scintillator fibers

    M. Yoshino, K. Kamada, S. Yamamoto, R. Yajima, R. Sasaki, M. Sagisaka, J. Kataoka, T. Horiai, Y. Yokota, A. Yoshikawa

    AIP Advances   13 ( 2 )  2023年02月

    　概要を見る

    Scintillators are key components in high-energy x-ray detectors for x-ray computed tomography, which are applied in medical diagnosis, nondestructive testing, and security inspection. Scintillators in x-ray imaging are required to have both high spatial resolution and sensitivity; however, a trade-off between spatial resolution and sensitivity exists. To improve the sensitivity of a scintillator, its thickness must be increased; however, spatial resolution deteriorates with increasing thickness. Here, we developed a well-aligned Tb-doped GdAlO3-αAl2O3 phase-separated scintillator fiber (PSSF) with a diameter of 1.25-μm by a micro-pulling-down method. The luminescence, scintillation, and imaging performances of a grown PSSF sample were evaluated. X-ray-induced radioluminescence measurements of the sample showed Tb3+ 4f-4f emissions in the wavelength range of 470-700 nm, and the maximum emission peak was at 550 nm. The contrast transfer function at 10 lp/mm was 82% for both 270 and 500 μm-thick PSSF samples. We calculated the luminescence index, which is the product of the scintillator's light yield and sensitivity, of the samples and compared their values with commercially available conventional CsI:Tl columnar scintillators. The Tb-doped GdAlO3-αAl2O3 PSSF exhibits higher contrast transfer function and luminescence index values at above 60 keV x-ray region compared with the tested conventional scintillators.

    DOI

    Scopus

    8
    被引用数
    (Scopus)

  • Development of 64-channel LSI with ultrafast analog and digital signal processing dedicated for photon-counting computed tomography with multi-pixel photon counter

    Makoto Arimoto, Daichi Sato, Tomoya Mizuno, Kotaro Yoshiura, Kairi Ishiguro, Takahiro Tomoda, Hiroki Kawashima, Satoshi Kobayashi, Jun Kataoka, Mayu Sagisaka, Hirokazu Ikeda, Shinsuke Terazawa, Satoshi Shiota

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1047  2023年02月

    　概要を見る

    X-ray computed tomography (CT) is non destructive visualization inside the human body. Recently, X-ray photon-counting CT (PC-CT) has drawn attention for reducing the high doses used for patients and acquiring spectral information to identify materials. To enable photon-counting imaging with a wide region (∼60 mm long) of a small animal, we developed a photon-counting system using a 64-channel multi-pixel photon counter (MPPC) array with a fast temporal response (a few nanoseconds) and a very large signal gain (∼106), combined with a 64-channel yttrium–gadolinium–aluminum–gallium garnet scintillator array. In particular, to realize ultra-fast analog and digital signal processing (>10 MHz/channel), we developed a 64-channel large-scale integrated circuit (LSI) named MPPC-CT64. We had previously developed a 16-channel PC-CT system with a 16-channel LSI (MPPC-CT16). Although the MPPC-CT16 realized photon-counting imaging for a ∼16-mm-long phantom, there were some energy uncertainties in the LSI, which degraded the obtained CT image quality. The MPPC-CT64 implements a function for correcting the threshold energies and also increases the number of energy thresholds from four to six, which provides more precise measurements of CT values dependent on X-ray energy. In this paper, we briefly present the electric architecture and performance evaluation of the LSI combined with MPPCs.

    DOI

    Scopus

    6
    被引用数
    (Scopus)

  • Development of an MPPC-based gamma-ray detector onboard a radiation source imager under high-dose environments and initial performance results

    Tomoya Mizuno, Makoto Arimoto, Daichi Sato, Kotaro Yoshiura, Takahiro Tomoda, Kairi Ishiguro, Jun Kataoka, Tatsuya Sawano, Daisuke Yonetoku, Shinsuke Terazawa, Satoshi Shiota

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1046  2023年01月

    　概要を見る

    Since the accident at the Fukushima Daiichi Nuclear Power Plant ∼10 years ago, various studies have been conducted focusing on the decontamination of radioactive materials and the decommissioning of the remains of the reactor. It is crucial to identify the locations of radioactive materials for the decontamination of a building that is exposed to high radiation doses. One of the most widely used methods is the visualization of gamma rays with energy information using a photon-counting imager. However, the existing imagers have limited functionality, making it difficult to implement them in such an environment. Therefore, we have developed a novel pinhole gamma imager containing multi-pixel photon counters (MPPCs) combined with fast scintillators, which are processed using fast signal-processing analog and digital large integrated circuits under high-dose environments. The two-dimensional sensor array developed in this study can obtain incident gamma-ray photon energies with a counting rate of a few MHz/mm2. Furthermore, we were able to perform two-dimensional gamma-ray imaging of an extremely strong radiation source of 60Co with ∼45 TBq, by combining the sensor array with the dedicated tungsten collimator and housing.

    DOI

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    4
    被引用数
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  • Experimental verification of efficacy of pBCT in terms of physical and biological aspects

    Mana Hosobuchi, Jun Kataoka, Hiromu Yokokawa, You Okazaki, Ryoichi Hirayama, Taku Inaniwa, Masashi Ueda, Mitsuhiro Kimura

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1045   167537  2023年01月  [査読有り]

    DOI

    Scopus

    4
    被引用数
    (Scopus)

  • Activation imaging: New concept of visualizing drug distribution with wide-band X-ray and gamma-ray imager

    N. Koshikawa, A. Omata, M. Masubuchi, J. Kataoka, Y. Kadonaga, K. Tokoi, S. Nakagawa, A. Imada, A. Toyoshima, K. Matsunaga, H. Kato, Y. Wakabayashi, T. Kobayashi, K. Takamiya, M. Ueda

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1045   167599  2023年01月  [査読有り]

    DOI

    Scopus

    1
    被引用数
    (Scopus)

  • Experiment of in vivo imaging with third generation setup using Photon-Counting CT with 64ch Multi-Pixel Photon Counter

    M. Sagisaka, T. Toyoda, J. Kataoka, M. Arimoto, H. Kawashima, S. Kobayashi, K. Murakami, K. Okumura, D. Sato, K. Yoshiura, T. Mizuno, K. Aiga, S. Terazawa, S. Shiota

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1045  2023年01月

    　概要を見る

    X-ray computed tomography is one of the commonly used diagnostic imaging technique. However, it has some problems which are lack of energy information and high dose exposure. These problems can be solved by using a next generation CT called Photon Counting CT (PC-CT). PC-CT can acquire multi-color images with significantly low radiation dose. The detector system of the PC-CT we propose consists of Multi-Pixel Photon Counter (MPPC) coupled with a high-speed scintillator thus can be made with lower cost and simpler system. In this study, we propose a novel method of material decomposition using the MPPC based PC-CT. Furthermore, we imaged mice with MPPC based PC-CT system as a first attempt. Iodine and gadolinium mixed contrast agents and gold-nanoparticles (AuNPs) were injected when imaging. In addition, the CT images of mice showed bone, lungs, heart, kidneys, and bladder. As a future prospect, we will work on visualizing the pharmacokinetics in mice.

    DOI

    Scopus

    5
    被引用数
    (Scopus)

  • High-precision time study of gamma-ray bursts during thunderstorms

    E. Kuriyama, M. Masubuchi, N. Koshikawa, R. Iwashita, A. Omata, T. Kanda, J. Kataoka, M. Tsurumi, G. Diniz, T. Enoto, Y. Wada

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1045   167515 - 167515  2023年01月

    DOI

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  • Cosmic-ray Boron Flux Measured from 8.4 GeV/n to 3.8 TeV/n with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   129 ( 25 )  2022年12月  [査読有り]

    　概要を見る

    We present the measurement of the energy dependence of the boron flux in cosmic rays and its ratio to the carbon flux in an energy interval from 8.4 GeV/n to 3.8 TeV/n based on the data collected by the Calorimetric Electron Telescope (CALET) during ∼6.4 yr of operation on the International Space Station. An update of the energy spectrum of carbon is also presented with an increase in statistics over our previous measurement. The observed boron flux shows a spectral hardening at the same transition energy E0∼200 GeV/n of the C spectrum, though B and C fluxes have different energy dependences. The spectral index of the B spectrum is found to be γ=-3.047±0.024 in the interval 25<E<200 GeV/n. The B spectrum hardens by ΔγB=0.25±0.12, while the best fit value for the spectral variation of C is ΔγC=0.19±0.03. The B/C flux ratio is compatible with a hardening of 0.09±0.05, though a single power-law energy dependence cannot be ruled out given the current statistical uncertainties. A break in the B/C ratio energy dependence would support the recent AMS-02 observations that secondary cosmic rays exhibit a stronger hardening than primary ones. We also perform a fit to the B/C ratio with a leaky-box model of the cosmic-ray propagation in the Galaxy in order to probe a possible residual value λ0 of the mean escape path length λ at high energy. We find that our B/C data are compatible with a nonzero value of λ0, which can be interpreted as the column density of matter that cosmic rays cross within the acceleration region.

    DOI PubMed

  • Short time sequential luminescence imaging of water during irradiation by protons

    Seiichi Yamamoto, Takuya Yabe, Katsunori Yogo, Takashi Akagi, Jun Kataoka

    Journal of Instrumentation   17 ( 12 )  2022年12月

    　概要を見る

    <jats:title>Abstract</jats:title>
    <jats:p>Although luminescence imaging of water during irradiation by particle ions is a promising method for dose estimation, it has only been tried for static images in which temporal information is not included. In addition to the positional distribution of the beam, temporal information is also important because the beams from a synchrotron-based therapy system have short pulse shapes called spills. The temporal information is also important for high dose rate, short-time radiotherapy, or so-called FLASH radiotherapy. To measure the particle ion beam distributions with precise temporal information, we conducted short time sequential luminescence imaging of protons. First, we measured short time sequential luminescence images during irradiation of a water phantom by 150-MeV protons using a cooled charge-coupled device (CCD) camera at 0.143-s intervals. With this imaging, the images showed beam distributions, but the shapes of the spill were not precisely evaluated in time intensity curves due to the insufficient sampling rate of the imaging. Then we measured short time sequential optical images with 0.053-s intervals. With this imaging, the images showed that the beam distributions in the spill shape could be measured, but the image and depth profiles evaluated from the images were noisy due to the insufficient light intensity. Consequently, we measured short time sequential luminescence images during irradiation of fluorescein (FS) water by 150-MeV protons. Since FS water produced ∼10 times higher luminescence, we could obtain high-intensity images enabling us to evaluate the time intensity curves based on the shape of the spills during measurement with 0.053-s intervals. The depth profiles of the beam were also obtained from the measured images. With these results, we confirmed that time sequential luminescence imaging was possible and, in such cases, FS water images measured at 0.053-s intervals are most promising to measure the short time sequential luminescence images during irradiation of protons.</jats:p>

    DOI

  • Multi-modal 3D imaging of radionuclides using multiple hybrid Compton cameras

    Akihisa Omata, Miho Masubuchi, Nanase Koshikawa, Jun Kataoka, Hiroki Kato, Atsushi Toyoshima, Takahiro Teramoto, Kazuhiro Ooe, Yuwei Liu, Keiko Matsunaga, Takashi Kamiya, Tadashi Watabe, Eku Shimosegawa, Jun Hatazawa

    Scientific Reports   12 ( 1 )  2022年12月

    　概要を見る

    <title>Abstract</title>For radiological diagnosis and radionuclide therapy, X-ray and gamma-ray imaging technologies are essential. Single-photon emission tomography (SPECT) and positron emission tomography (PET) play essential roles in radiological diagnosis, such as the early detection of tumors. Radionuclide therapy is also rapidly developing with the use of these modalities. Nevertheless, a limited number of radioactive tracers are imaged owing to the limitations of the imaging devices. In a previous study, we developed a hybrid Compton camera that conducts simultaneous Compton and pinhole imaging within a single system. In this study, we developed a system that simultaneously realizes three modalities: Compton, pinhole, and PET imaging in 3D space using multiple hybrid Compton cameras. We achieved the simultaneous imaging of Cs-137 (Compton mode targeting 662 keV), Na-22 (PET mode targeting 511 keV), and Am-241 (pinhole mode targeting 60 keV) within the same field of view. In addition, the imaging of Ga-67 and In-111, which are used in various diagnostic scenarios, was conducted. We also verified that the 3D distribution of the At-211 tracer inside a mouse could be imaged using the pinhole mode.

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  • Activation imaging of drugs with hybrid Compton camera: A proof-of-concept study

    N. Koshikawa, A. Omata, M. Masubuchi, Y. Okazaki, J. Kataoka, K. Matsunaga, H. Kato, A. Toyoshima, Y. Wakabayashi, T. Kobayashi

    Applied Physics Letters   121 ( 19 ) 193701 - 193701  2022年11月  [査読有り]

    　概要を見る

    The visualization of drugs is essential for cancer treatment. Although several methods for visualizing drugs have been proposed, a versatile method that can be easily applied to various drugs has not yet been established. Therefore, we propose “activation imaging,” in which a drug is irradiated with thermal neutrons and becomes radioactive, enabling visualization using emitted x rays and/or gamma rays. Activation imaging does not require the conjugation of specific tracers with drugs. Therefore, it can be easily applied to a variety of drugs, drug carriers (e.g., metal nanoparticles), and contrast agents. In this study, neutron activation, gamma-ray spectroscopy, and imaging of drug carriers, anticancer drug, and contrast agents were performed. Gold nanoparticles (AuNPs) and platinum nanoparticles were used as drug carriers, cisplatin was used as an anticancer drug, and gadoteridol and iohexol were used as contrast agents. As a neutron source, the RIKEN accelerator-driven compact neutron source II (RANS-II) was utilized. The imaging was performed using a hybrid Compton camera (HCC). The HCC can visualize x rays and gamma rays ranging from a few keV to nearly 1 MeV, which enables the imaging of various x rays and gamma rays emitted from the activated drugs. As a result, the gamma-ray spectra indicated the generation of radioisotopes through neutron irradiation, and AuNPs and iohexol were visualized.

    DOI

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    3
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  • Optimization of the energy window setting in Ir-192 source imaging for high-dose-rate brachytherapy using a YAP(Ce) gamma camera

    Jura Nagata, Kohei Nakanishi, Seiichi Yamamoto, Takuya Yabe, Katsunori Yogo, Yumiko Noguchi, Kuniyasu Okudaira, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Physica Medica   103   66 - 73  2022年11月

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  • Compton Camera Imaging of a Gamma-Ray Glow From a Thunderstorm

    E. Kuriyama, M. Masubuchi, N. Koshikawa, R. Iwashita, A. Omata, T. Kanda, J. Kataoka, M. Tsurumi, G. Diniz, T. Enoto, Y. Wada

    Geophysical Research Letters   49 ( 19 )  2022年10月

    　概要を見る

    Gamma-ray glows associated with thunderclouds have been observed since the 1980s, however it remains unclear how, and at which thunderstorms gamma-ray glows are generated in dense atmospheres. In this study, we report the first Compton camera imaging of a gamma-ray glow from a winter thundercloud. On 14 January 2022, using two identical Bi4Ge3O12 scintillators in energy range of 0.05–5 MeV, we detected two gamma-ray glows lasting ∼4 min in a mountain area 25 km from the Japan Sea and 410 m above sea level. The same events were also observed by the Compton camera, where the first glow we observed suggested statistically significant (4.0 and 5.9 σ level) signals of two enhanced concentrations in gamma-ray photon images in a range of 0.15–1.5 MeV. These concentrations were most clearly observed in a time window of Δt = 50 s around the peak intensity of the gamma-ray glow.

    DOI

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    2
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  • Wide-band X-ray and gamma-ray imaging of living mouse to reveal pharmacokinetics of At-211

    M. Masubuchi, A. Omata, N. Koshikawa, J. Kataoka, H. Kato, A. Toyoshima, K. Ooe, D. Katayama, T. Teramoto, K. Matsunaga, T. Kamiya, T. Watabe, E. Shimosegawa, J. Hatazawa

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment     167581 - 167581  2022年10月

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    3
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  • Monte Carlo approach to comparison of parallel-hole collimators of clinical scintillation camera system for imaging astatine-211 (At-211)

    Kohei Nakanishi, Seiichi Yamamoto, Jun Kataoka

    Journal of Instrumentation   17 ( 10 ) T10007 - T10007  2022年10月

    　概要を見る

    Abstract

    Astatine-211 (At-211) is a promising alpha particle emitter for targeted radionuclide therapy. Since its daughter isotope (polonium-211(Po-211)) emits characteristic X-rays of about 80 keV, the distribution of At-211 in the body can be imaged by detecting the X-rays with a scintillation camera. However, the isotopes also emit high-energy gamma photons that are collimated with difficulty for a parallel-hole collimator of a clinical scintillation camera system, and thus the selection of a collimator is important. In this study, we compared the performances of low-energy high-resolution (LEHR), low-energy all-purpose (LEAP), medium-energy (ME), and high-energy (HE) parallel-hole collimators for At-211 using Monte Carlo simulation. We simulated a clinical scintillation camera system with the collimators using the Geant4 toolkit. The energy spectra, sensitivities, and spatial resolutions for the point source of At-211 were evaluated. Moreover, we simulated imaging of six sphere sources of At-211 in a 1-cm-thick cylindrical phantom filled with At-211 solution to evaluate image contrast. All of the results in this study are simulation data. The spatial resolution with LEHR was 7.6 mm full width at half maximum (FWHM) and the highest between collimators, while the sensitivity with LEAP was 85 cps/MBq and the highest. The image contrast acquired with the ME collimator was superior to those with the other collimators. We concluded that the LEHR, LEAP, and ME collimators had their advantages, so an optimum collimator should be selected depending on the purpose of imaging of At-211, although there was no advantage in using the HE collimator for the imaging of At-211.

    DOI

  • Performance demonstration of a novel photon-counting CT for preclinical application

    T. Toyoda, J. Kataoka, M. Sagisaka, M. Arimoto, D. Sato, K. Yoshiura, H. Kawashima, S. Kobayashi, J. Kotoku, S. Terazawa, S. Shiota, M. Ueda

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1040  2022年10月

    　概要を見る

    Photon-counting computed tomography (PC-CT) has attracted attention over the last few years as the next-generation CT technique that solves the problems encountered in clinical CT. In PC-CT, dark current and electronic noise can be reduced by setting the energy threshold to exceed the noise level, which leads to a low-dose scan. Furthermore, multiple energy thresholds realize multicolor CT imaging, which is not possible with clinical CT. Recently, we proposed a novel PC-CT system consisting of a multipixel photon counter (MPPC) coupled with a high-speed scintillator, performing simultaneous imaging of multiple contrast agents and estimate concentration. However, the PC-CT images obtained by our PC-CT system faces some limitations, such as degradation of image quality due to the lack of photon statistics and/or image resolution loss due to the pixel size of the detectors. In this study, the signal-to-noise ratio (SNR) of the PC-CT images was improved by applying machine-learning models, that is, U-Net and Noise2Noise, to the PC-CT images. In addition, a new imaging method was developed to acquire the high-resolution CT images required for clinical use. As a result, the resolution of the CT images improved from 1.04 mm to 0.77 mm. Finally, the visualization of contrast agents in plants was set as a challenge for the next step towards the clinical application of MPPC-based PC-CT. The results demonstrate that our PC-CT system can provide color imaging not only in phantom-based experiments, but also in plants close to an organism.

    DOI

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    2
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  • Short‐time sequential high‐energy gamma photon imaging using list‐mode data acquisition system for high‐dose‐rate brachytherapy

    Jura Nagata, Seiichi Yamamoto, Takuya Yabe, Katsunori Yogo, Kohei Nakanishi, Yumiko Noguchi, Kuniyasu Okudaira, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Medical Physics    2022年09月

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  • A high-resolution X-ray microscope system for performance evaluation of scintillator plates

    Seiichi Yamamoto, Masao Yoshino, Kei Kamada, Ryuga Yajima, Akira Yoshikawa, Mayu Sagisaka, Jun Kataoka

    JOURNAL OF INSTRUMENTATION   17 ( 9 )  2022年09月

    　概要を見る

    In the development of new scintillators for X-ray imaging, a high-resolution and highly efficient system is required to evaluate the performance of the scintillator plates. For this purpose, we developed a high-resolution X-ray microscope system. The developed compact X-ray microscope system is based on a magnifying unit and a cooled charge-coupled device (CCD) camera, combined with a small industrial X-ray irradiation system. Using this system, we carried out imaging of three scintillator plates and evaluated their spatial resolution. Each scintillator plates was set in front of the lens of the objective, X-rays were irradiated to the scintillator plates, and transmission images of masks were acquired. The measured spatial resolution of the scintillator plates varied from 16 mu m to 30 mu m, depending on the type of scintillator plate. The focus size of the X-ray tube had an almost negligible effect on the spatial resolution of the images for the evaluated scintillator plates.

    DOI

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    5
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  • Advantages of using larger-diameter pinhole collimator for prompt X-ray imaging during irradiation with carbon ions

    Seiichi Yamamoto, Takuya Yabe, Takashi Akagi, Mitsutaka Yamaguchi, Naoki Kawachi, Kei Kamada, Akira Yoshikawa, Jun Kataoka

    Journal of Instrumentation   17 ( 9 )  2022年09月

    　概要を見る

    Prompt secondary electron bremsstrahlung X-ray (prompt X-ray) imaging using a low-energy X-ray camera is a promising method for observing a beam shape from outside the subject. However, the images measured within short times suffer from statistical noise. Consequently, we performed prompt X-ray imaging with higher sensitivity using a larger-diameter pinhole collimator and compared the results with those of a conventional collimator. Prompt X-ray imaging was conducted during irradiation with pencil beams of 241.5-MeV/n carbon ions to a water phantom. A newly developed X-ray camera with a 4-mm diameter as well as conventional 1.5-mm-diameter pinhole collimators was used for the imaging in list mode, and we compared the prompt X-ray images, energy spectra, and time count rate curves between 1.5-mm-diameter and 4-mm-diameter pinhole collimators. The prompt X-ray images taken with the 4-mm-diameter pinhole collimators had a1/47 times higher sensitivity with 70 % lower offset fractions originating from the prompt gamma photons. Furthermore, the ranges were more precisely estimated with the 4-mm collimator than with the 1.5-mm collimator. The energy spectra showed less contamination by tungsten-characteristic X-rays for the 4-mm pinhole collimator. Even for images measured with 0.1-s intervals, the beam shapes and time count rate curves could be obtained with less statistical noise using the 4-mm-diameter pinhole collimators. The use of the 4-mm-diameter pinhole collimator attached to the X-ray camera had advantages for prompt X-ray imaging with high sensitivity and low background, enabling us to image the beams even with short-Time measurements.

    DOI

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  • Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   129 ( 10 )  2022年09月

    DOI

  • Technical note: Correcting angular dependencies using non‐polarized components of Cherenkov light in water during high‐energy X‐ray irradiation

    Chihiro Toyonaga, Seiichi Yamamoto, Takuya Yabe, Kuniyasu Okudaira, Katsunori Yogo, Yoshiyuki Hirano, Jun Kataoka

    Medical Physics   49 ( 8 ) 5409 - 5416  2022年08月  [査読有り]

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  • Development of a capillary plate based fiber-structured ZnS(Ag) scintillator

    Seiichi Yamamoto, Kei Kamada, Masao Yoshino, Akira Yoshikawa, Naoki Sunaguchi, Jun Kataoka

    JOURNAL OF INSTRUMENTATION   17 ( 8 )  2022年08月

    　概要を見る

    Silver-doped zinc sulfide (ZnS(Ag)) is an opaque powder scintillator that is mainly used for detection or imaging of charged particles such as alpha particles. Since ZnS(Ag) is not transparent, the thickness of ZnS(Ag) was limited to -10 mu m. If a thicker ZnS(Ag) scintillator could be developed, it would be useful for studies such as high-energy particle ion detection as well as beta particle or gamma photon detection. We developed a ZnS(Ag) fiber-structured scintillator using a capillary plate in which ZnS(Ag) powder was encapsulated in the capillaries. The thickness of the capillary plate was 400 mu m, and the light produced in ZnS(Ag) escaped from the capillaries, spread through the transparent lead glass area, and reached the opposite side of the plate; consequently, the opaque character and absorption of light could be avoided. The amount of light emitted from the capillary plate based fiber-structured ZnS(Ag) was almost the same as that of a commercially available ZnS (Ag) film, but the detection efficiency was about 1/5 (-20%). The amount of light emitted from beta particles and gamma photons per MeV was less than 1% of that from alpha particles. The spatial resolution of the developed capillary plate based fiber-structured ZnS(Ag) scintillator for 5.5 MeV alpha particles was -200 mu m FWHM. Imaging of the slits and light spots from alpha particles could be achieved with the developed scintillator combined with an electron-multiplied charge-coupled device (EM-CCD) camera. The developed capillary plate based fiber-structured ZnS(Ag) will be useful for detecting high-energy particle ions.

    DOI

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  • CALET Search for Electromagnetic Counterparts of Gravitational Waves during the LIGO/Virgo O3 Run

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    The Astrophysical Journal   933 ( 1 ) 85 - 85  2022年07月

    　概要を見る

    Abstract

    The CALorimetric Electron Telescope (CALET) on the International Space Station consists of a high-energy cosmic-ray CALorimeter (CAL) and a lower-energy CALET Gamma-ray Burst Monitor (CGBM). CAL is sensitive to electrons up to 20 TeV, cosmic-ray nuclei from Z = 1 through Z ∼ 40, and gamma rays over the range 1 GeV–10 TeV. CGBM observes gamma rays from 7 keV to 20 MeV. The combined CAL-CGBM instrument has conducted a search for gamma-ray bursts (GRBs) since 2015 October. We report here on the results of a search for X-ray/gamma-ray counterparts to gravitational-wave events reported during the LIGO/Virgo observing run O3. No events have been detected that pass all acceptance criteria. We describe the components, performance, and triggering algorithms of the CGBM—the two Hard X-ray Monitors consisting of LaBr3(Ce) scintillators sensitive to 7 keV–1 MeV gamma rays and a Soft Gamma-ray Monitor BGO scintillator sensitive to 40 keV–20 MeV—and the high-energy CAL consisting of a charge detection module, imaging calorimeter, and the fully active total absorption calorimeter. The analysis procedure is described and upper limits to the time-averaged fluxes are presented.

    DOI

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  • Trials of transmission imaging using clinically used Ir-192 source for high-dose-rate brachytherapy

    J. Nagata, S. Yamamoto, K. Nakanishi, Y. Noguchi, K. Okudaira, J. Kataoka

    Journal of Instrumentation   17 ( 06 ) T06009 - T06009  2022年06月  [査読有り]

    　概要を見る

    Abstract

    In high-dose-rate (HDR) brachytherapy, verification of an Ir-192 source's position during treatment is required. One of the methods for this used a high-energy pinhole gamma camera to image the position of the source, but the absolute position of the source cannot be measured. To confirm the absolute position, it will be useful to acquire the transmission image of a subject in addition to the gamma photon image at the same time without using an additional X-ray system. To measure the transmission images, we tried to use the high-energy gamma photons emitted from the Ir-192 source used for the therapy. We developed a high-energy gamma photon imaging system composed of 1-mm-thick Pr doped Gd2O2S (GOS), a surface mirror, and a cooled charge-coupled device (CCD) camera. The developed imaging system achieved transmission imaging of high-energy gamma photons by transporting the Ir-192 source in front of the imaging system. The spatial resolution of the imaging system was better than 2.4 mm FWHM with and without a 10-cm-thick acrylic block set between the imaging system and the source. Moderate spatial resolution and contrast images of phantoms were obtained with the system. For the dynamic imaging mode, continuous images of the phantoms were measured with 1-sec intervals. There was no observable difference in the transmission images by the movement of the Ir-192 source. Transmission imaging of subjects using an Ir-192 source for HDR brachytherapy could be achieved using our developed imaging system. The system offers a new method to measure the real-time transmission images of the subject during HDR brachytherapy.

    DOI

  • CALET on the International Space Station: a precise measurement of the iron spectrum

    O. Adriani, Yosui Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, Caterina Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, Francesco Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Proceedings of Science   398  2022年05月

    　概要を見る

    The Calorimetric Electron Telescope (CALET) was launched on the International Space Station in 2015 and since then has collected a large sample of cosmic-ray charged particles over a wide energy. Thanks to a couple of layers of segmented plastic scintillators placed on top of the detector, the instrument is able to identify the charge of individual elements from proton to iron (and above). The imaging tungsten scintillating fiber calorimeter provides accurate particle tracking and the lead tungstate homogeneous calorimeter can measured the energy with a wide dynamic range. One of the CALET scientific objectives is to measure the energy spectra of cosmic rays to shed light on their acceleration and propagation in the Galaxy. By the observation in first five years, a precise measurement of the iron spectrum is now available in the range of kinetic energy per nucleon from 10 GeV/n to 2 TeV/n. The CALET's result with a description of the analysis and details on systematic uncertainties will be illustrated. Also, a comparison with previous experiments' results is given.

  • Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/ n to 240 GeV/ n with CALET on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   128 ( 13 )  2022年04月

    　概要を見る

    The relative abundance of cosmic ray nickel nuclei with respect to iron is by far larger than for all other transiron elements; therefore it provides a favorable opportunity for a low background measurement of its spectrum. Since nickel, as well as iron, is one of the most stable nuclei, the nickel energy spectrum and its relative abundance with respect to iron provide important information to estimate the abundances at the cosmic ray source and to model the Galactic propagation of heavy nuclei. However, only a few direct measurements of cosmic-ray nickel at energy larger than ∼3 GeV/n are available at present in the literature, and they are affected by strong limitations in both energy reach and statistics. In this Letter, we present a measurement of the differential energy spectrum of nickel in the energy range from 8.8 to 240 GeV/n, carried out with unprecedented precision by the Calorimetric Electron Telescope (CALET) in operation on the International Space Station since 2015. The CALET instrument can identify individual nuclear species via a measurement of their electric charge with a dynamic range extending far beyond iron (up to atomic number Z=40). The particle's energy is measured by a homogeneous calorimeter (1.2 proton interaction lengths, 27 radiation lengths) preceded by a thin imaging section (3 radiation lengths) providing tracking and energy sampling. This Letter follows our previous measurement of the iron spectrum [1O. Adriani (CALET Collaboration), Phys. Rev. Lett. 126, 241101 (2021).PRLTAO0031-900710.1103/PhysRevLett.126.241101], and it extends our investigation on the energy dependence of the spectral index of heavy elements. It reports the analysis of nickel data collected from November 2015 to May 2021 and a detailed assessment of the systematic uncertainties. In the region from 20 to 240 GeV/n our present data are compatible within the errors with a single power law with spectral index -2.51±0.07.

    DOI PubMed

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  • Interaction of the galactic-centre super bubbles with the gaseous disc

    Yoshiaki Sofue, Jun Kataoka

    Monthly Notices of the Royal Astronomical Society   506 ( 2 ) 2170 - 2180  2021年09月

    　概要を見る

    The interaction of Galactic centre (GC) super bubbles (GSBs) with the gaseous disc and halo of the Milky Way is investigated using radio continuum, X-ray, H i, and CO line surveys. The radio North Polar Spur (NPS) constitutes the brightest eastern ridge of GSB, brightening towards the galactic plane and reaching l = 22°, b = +2° at the sharpest end, where it intersects the tangential direction of the 3-kpc-expanding ring and crater. Examination of the spur ridges reveals that the entire GSB, including the NPS and its counter spurs, constitutes a GC-symmetrical ω/ω shape. The thickness and gas density of the H i and CO discs are shown to increase sharply from the inside (lower longitude) to the outside the 3-kpc crater. Formation of crater is explained by the sweeping of the upper layer of disc gas by the shock wave from the GC by the explosion ~10 My ago with the emitted energy of several 1055 erg. Based on the discussion, a unified view on the structure and formation mechanism of GSB is presented.

    DOI

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    12
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  • Spatial Variations of Magnetic Field along Active Galactic Nuclei Jets on Sub-parsec to Megaparsec Scales

    S. Ito, Y. Inoue, J. Kataoka

    Astrophysical Journal   916 ( 2 )  2021年08月

    　概要を見る

    We report the systematic analysis of knots, hotspots, and lobes in 57 active galactic nuclei (AGNs) to investigate the variation of the magnetic field along the jet from the sub-parsec base to the terminus on kiloparsec-to-megaparsec scales. Expanding the number of radio/X-ray samples in the work of Kataoka & Stawarz, we analyzed the data in 12 FR i and 30 FR ii radio galaxies, 12 quasars, and three BL Lac objects, which contained 76 knots, 42 hotspots, and 29 radio lobes. We first derived the equipartition magnetic fields in the cores and then estimated those in various jet components by assuming B est ∝ d -1, where d is the distance from the jet base. On the other hand, the magnetic field in large-scale jets (knots, hotspots, and lobes), B eq, can be estimated from the observed flux and spatial extent under the equipartition hypothesis. We show that the magnetic field decreases as the distance along the jet increases, but generally in a more gentle way than ∝d -1. The increase in B eq/B est at large d may suggest the deceleration of the jet downstream, but there is no difference between FR i and FR ii jets. Moreover, the magnetic fields in the hotspots are systematically larger than those in knots and lobes. Finally, we applied the same analysis to knots and lobes in Centaurus A to check whether the above discussion will hold even in a single jet source.

    DOI

    Scopus

    3
    被引用数
    (Scopus)

  • Measurement of the Iron Spectrum in Cosmic Rays from 10 GeV/n to 2.0 TeV/n with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. Link, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   126 ( 24 )  2021年06月

    　概要を見る

    The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray iron over a wide energy interval. In this Letter a measurement of the iron spectrum is presented in the range of kinetic energy per nucleon from 10 GeV/n to 2.0 TeV/n allowing the inclusion of iron in the list of elements studied with unprecedented precision by space-borne instruments. The measurement is based on observations carried out from January 2016 to May 2020. The CALET instrument can identify individual nuclear species via a measurement of their electric charge with a dynamic range extending far beyond iron (up to atomic number Z=40). The energy is measured by a homogeneous calorimeter with a total equivalent thickness of 1.2 proton interaction lengths preceded by a thin (3 radiation lengths) imaging section providing tracking and energy sampling. The analysis of the data and the detailed assessment of systematic uncertainties are described and results are compared with the findings of previous experiments. The observed differential spectrum is consistent within the errors with previous experiments. In the region from 50 GeV/n to 2 TeV/n our present data are compatible with a single power law with spectral index -2.60±0.03.

    DOI PubMed

    Scopus

    35
    被引用数
    (Scopus)

  • Machine-learning Application to Fermi-LAT Data: Sharpening All-sky Map and Emphasizing Variable Sources

    Shogo Sato, Jun Kataoka, Soichiro Ito, Jun'Ichi Kotoku, Masato Taki, Asuka Oyama, Takaya Toyoda, Yuki Nakamura, Marino Yamamoto

    Astrophysical Journal   913 ( 2 )  2021年06月

    　概要を見る

    A novel application of machine-learning (ML) based image processing algorithms is proposed to analyze an all-sky map (ASM) obtained using the Fermi Gamma-ray Space Telescope. An attempt was made to simulate a 1 yr ASM from a short-exposure ASM generated from 1-week observation by applying three ML-based image processing algorithms: dictionary learning, U-net, and Noise2Noise. Although the inference based on ML is less clear compared to standard likelihood analysis, the quality of the ASM was generally improved. In particular, the complicated diffuse emission associated with the galactic plane was successfully reproduced only from 1-week observation data to mimic a ground truth (GT) generated from a 1 yr observation. Such ML algorithms can be implemented relatively easily to provide sharper images without various assumptions of emission models. In contrast, large deviations between simulated ML maps and the GT map were found, which are attributed to the significant temporal variability of blazar-type active galactic nuclei (AGNs) over a year. Thus, the proposed ML methods are viable not only to improve the image quality of an ASM but also to detect variable sources, such as AGNs, algorithmically, i.e., without human bias. Moreover, we argue that this approach is widely applicable to ASMs obtained by various other missions; thus, it has the potential to examine giant structures and transient events, both of which are rarely found in pointing observations.

    DOI

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  • Development of a neutron camera system to visualize the dose distribution by secondary neutrons for safer proton therapy

    R. Tanaka, J. Kataoka, F. Nishi, H. Yokokawa, T. Inaniwa

    Journal of Instrumentation   16 ( 6 )  2021年06月

    　概要を見る

    Proton therapy has recently garnered significant attention as an effective treatment for cancer that can effectively damage tumor tissues while reducing doses to healthy tissues and organs. However, secondary neutrons generated by interactions with protons and brass collimators or the patient's body may cause harm to the human body. Nevertheless, the risks are yet to be precisely assessed or reflected in actual treatment plans. In this study, we develop a novel neutron camera that enables the visualization of spatial dose distribution by secondary neutrons. First, a neutron camera comprising two layers of units is constructed; each of the layer is composed of a plastic scintillator coupled with a photomultiplier tube. As a preliminary experiment, it is confirmed that the developed camera can visualize fission neutrons from a 252Cf source. Subsequently, secondary neutrons are observed from a brass (imitating the brass collimator) and water (imitating the patient's body) phantom irradiated with a 70 MeV proton beam, in which the neutron camera is placed at 0°, 15° (only in the case of brass) and 30° from each phantom 30 cm ahead. Following neutron/gamma event selections using two methods, i.e., time of flight and pulse shape discrimination, each of the reconstructed images successfully converged at the correct positions, with average angular resolutions of 21° (brass, full width at half maximum (FWHM)) and 19° (water, FWHM). Furthermore, dosimetry using the G(E) function method is applied to the images, enabling a dose distribution image to be created using secondary neutrons. As a result, the evaluated dose rate is 307 μSv/min for brass and 88.1 μSv/min for water, which are 86 % and 64 % those of the simulated dose rates, respectively. Eventually, future tasks for the utilization of the camera in actual proton therapy are discussed.

    DOI

    Scopus

    2
    被引用数
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  • Application of machine-learning models to improve the image quality of photon-counting CT images

    T. Toyoda, S. Sato, H. Kiji, J. Kataoka, J. Kotoku, M. Taki

    Journal of Instrumentation   16 ( 5 )  2021年05月

    　概要を見る

    X-ray computed tomography (CT) has been widely used in medical diagnostic imaging. However, conventional, energy-integrated CT requires a high radiation dose and can only provide monochromatic images that cannot eliminate various artifacts. In contrast, photon-counting CT (PC-CT) provides low-dose multicolor CT imaging, which enables the identification of multiple contrast agents. However, in the PC-CT system, the lack of photon statistics, which is also caused by image reconstruction in the limited energy band, severely affects the image quality. In this study, we applied three types of machine-learning (ML) techniques to improved the image quality of PC-CT, that is, dictionary learning, U-Net, and Noise2Noise. These ML models were trained using low- and high-dose image pairs created in simple steps. The trained ML models were applied to simulated data, and experimental PC-CT images of contrast agents used in clinical practice. Consequently, in the simulated data, the peak signal-to-noise ratio (PSNR) value improved from 21.3 for the input to 26.6, 33.3, and 30.1 for dictionary learning, U-Net, and Noise2Noise, respectively. Furthermore, in the actual PC-CT images, we successfully reproduced PC-CT images with high PSNR, which enabled simultaneous imaging of multiple contrast agents with improved accuracy of concentration estimation. As a future perspective, we will develop a processing technique that can be applied to in vivo CT images.

    DOI

    Scopus

    2
    被引用数
    (Scopus)

  • 治療診断統合型スペクトラルCTに向けた低濃度ナノ薬剤イメージングの実証

    Dima Djara Sonia, 木地 浩章, 豊田 貴也, 片岡 淳, 有元 誠, 佐藤 大地, 吉浦 宏大龍, 川嶋 広貴, 小林 聡, 寺澤 慎祐, 塩田 諭, 池田 博一

    応用物理学会学術講演会講演予稿集   2021.1   492 - 492  2021年02月

    DOI

  • 次世代フォトンカウンティングCTによる多系統イメージングの性能評価

    佐藤 大地, 有元 誠, 吉浦 宏大龍, 水野 睦也, 川嶋 広貴, 小林 聡, 片岡 淳, 木地 浩章, 豊田 貴也, Dima Sonia, 池田 博一, 寺澤 慎祐, 塩田 諭

    応用物理学会学術講演会講演予稿集   2021.1   491 - 491  2021年02月

    DOI

  • Origin of galactic spurs: New insight from radio/X-ray all-sky maps

    Jun Kataoka, Marino Yamamoto, Yuki Nakamura, Soichiro Ito, Yoshiaki Sofue, Yoshiyuki Inoue, Takeshi Nakamori, Tomonori Totani

    Astrophysical Journal   908 ( 1 )  2021年02月

    　概要を見る

    In this study, we analyze giant Galactic spurs seen in both radio and X-ray all-sky maps to reveal their origins. We discuss two types of giant spurs: one is the brightest diffuse emission near the map's center, which is likely to be related to Fermi bubbles (NPSs/SPSs, north/south polar spurs, respectively), and the other is weaker spurs that coincide positionally with local spiral arms in our Galaxy (LAS, Local Arm spur). Our analysis finds that the X-ray emissions, not only from the NPS but also from the SPS, are closer to the Galactic center by ~5° compared with the corresponding radio emission. Furthermore, larger offsets of 10°-20° are observed in the LASs; however, they are attributed to different physical origins. Moreover, the temperature of the X-ray emission is kT ≃ 0.2 keV for the LAS, which is systematically lower than those of the NPS and SPS (kT ≃ 0.3 keV) but consistent with the typical temperature of Galactic halo gas. We argue that the radio/X-ray offset and the slightly higher temperature of the NPS/SPS X-ray gas are due to the shock compression/heating of halo gas during a significant Galactic explosion in the past, whereas the enhanced X-ray emission from the LAS may be due to the weak condensation of halo gas in the arm potential or star formation activity without shock heating.

    DOI

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    3
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  • Performance Estimate of MPPC-based PC-CT System and Initial Results of CT Image Contrast

    D. Sato, M. Arimoto, K. Yoshiura, T. Mizuno, K. Aiga, H. Kawashima, S. Kobayashi, J. Kataoka, T. Toyoda, M. Sagisaka, H. Ikeda, S. Terazawa, S. Shiota

    2021 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, NSS/MIC 2021 and 28th International Symposium on Room-Temperature Semiconductor Detectors, RTSD 2022    2021年

    　概要を見る

    X-ray computed tomography (CT) is widely used for three-dimensional nondestructive X-ray imaging of the internal structure of the human body or industrial materials. For modern technology in the medical field, dual-energy CT (DE-CT) with two types of X-ray effective energy has generally been used. However, the X-ray signals of DE-CT are integrated and read out in the form of a current. Thus, contamination with dark noise significantly degrades such imaging qualities as contrast, which causes a large radiation dose to patients. In addition, little energy information on DE-CT results in poor material discrimination of target materials. Recently, the photon-counting CT (PC-CT) system has developed for future CT technology. Because the PC-CT system can detect individual X-ray photons, the dark-noise effect expected to be highly suppressed. The multiple energy data obtained by PC-CT provide fruitful information on the energy dependence of the CT values, leading to high potential for material discrimination. Thus, an MPPC-based PC-CT system combined with high-speed scintillators has been proposed, and a 64-channel CT array system was developed recently. In this study, the details of the performance estimate of the MPPC-based PC-CT system were investigated in terms of energy information and photon-counting capability. The initial results of the CT image contrast compared with the clinical DE-CT system are presented. They show that the proposed PC-CT system achieved a similar contrast-to-noise ratio value to that of the clinical DE-CT.

    DOI

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    1
    被引用数
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  • 64-channel photon-counting computed tomography using a new MPPC-CT system

    H. Kiji, T. Maruhashi, T. Toyoda, J. Kataoka, M. Arimoto, D. Sato, K. Yoshiura, S. Kobayashi, H. Kawashima, S. Terazawa, S. Shiota, H. Ikeda

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   984  2020年12月

    　概要を見る

    X-ray computed tomography (CT) is a widely used diagnostic tool to visualize the interior of the human body. However, the exposure dose of conventional CT in a single scan is large, typically 10 mSv, and therefore, it is necessary to find ways to reduce the radiation dose. Furthermore, conventional CT does not contain the energy information of individual X-ray photons because the X-ray signals are read out as an integrated form. This causes misidentification of materials. To resolve this issue, we propose a novel photon counting CT (PC-CT) system consisting of multi-pixel photon counters (MPPCs) coupled with high speed scintillators. The system has a 64-channel MPPC array that improves energy information and wide-area imaging. By fine energy adjustment and increasing the number of energy thresholds to six, which were newly implemented in the 64-channel PC-CT system, we succeeded in accurately estimating the concentrations of contrast agents such as iodine and gadolinium. Moreover, for mixed phantoms of iodine and gadolinium, we demonstrate discrimination between them, and estimate the concentrations individually, which cannot be done by conventional CTs. This shows great potential in expanding the applications of X-ray CTs.

    DOI

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    15
    被引用数
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  • Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10 GeV/ n to 2.2 TeV/ n with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. Link, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, S. Sugita, J. E. Suh, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   125 ( 25 )  2020年12月

    　概要を見る

    In this paper, we present the measurement of the energy spectra of carbon and oxygen in cosmic rays based on observations with the Calorimetric Electron Telescope on the International Space Station from October 2015 to October 2019. Analysis, including the detailed assessment of systematic uncertainties, and results are reported. The energy spectra are measured in kinetic energy per nucleon from 10 GeV/n to 2.2 TeV/n with an all-calorimetric instrument with a total thickness corresponding to 1.3 nuclear interaction length. The observed carbon and oxygen fluxes show a spectral index change of ∼0.15 around 200 GeV/n established with a significance >3σ. They have the same energy dependence with a constant C/O flux ratio 0.911±0.006 above 25 GeV/n. The spectral hardening is consistent with that measured by AMS-02, but the absolute normalization of the flux is about 27% lower, though in agreement with observations from previous experiments including the PAMELA spectrometer and the calorimetric balloon-borne experiment CREAM.

    DOI PubMed

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    50
    被引用数
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  • Performance demonstration of a hybrid Compton camera with an active pinhole for wide-band X-ray and gamma-ray imaging

    Akihisa Omata, Jun Kataoka, Kazuya Fujieda, Shogo Sato, Eri Kuriyama, Hiroki Kato, Atsushi Toyoshima, Takahiro Teramoto, Kazuhiro Ooe, Yuwei Liu, Keiko Matsunaga, Takashi Kamiya, Tadashi Watabe, Eku Shimosegawa, Jun Hatazawa

    Scientific Reports   10 ( 1 )  2020年12月

    　概要を見る

    X-ray and gamma-ray imaging are technologies with several applications in nuclear medicine, homeland security, and high-energy astrophysics. However, it is generally difficult to realize simultaneous wide-band imaging ranging from a few tens of keV to MeV because different interactions between photons and the detector material occur, depending on the photon energies. For instance, photoabsorption occurs below 100 keV, whereas Compton scattering dominates above a few hundreds of keV. Moreover, radioactive sources generally emit both X-ray and gamma-ray photons. In this study, we develop a “hybrid” Compton camera that can simultaneously achieve X-ray and gamma-ray imaging by combining features of “Compton” and “pinhole” cameras in a single detector system. Similar to conventional Compton cameras, the detector consists of two layers of scintillator arrays with the forward layer acting as a scatterer for high-energy photons (> 200 keV) and an active pinhole for low-energy photons (< 200 keV). The experimental results on the performance of the hybrid camera were consistent with those from the Geant4 simulation. We simultaneously imaged 241Am (60 keV) and 137Cs (662 keV) in the same field of view, achieving an angular resolution of 10∘ (FWHM) for both sources. In addition, imaging of 211At was conducted for the application in future nuclear medicine, particularly radionuclide therapy. The initial demonstrative images of the 211At phantom were reconstructed using the pinhole mode (using 79 keV) and Compton mode (using 570 keV), exhibiting significant similarities in source-position localization. We also verified that a mouse injected with 1 MBq of 211At can be imaged via pinhole-mode measurement in an hour.

    DOI PubMed

    Scopus

    33
    被引用数
    (Scopus)

  • Precision spectroscopy of cesium-137 from the ground to 150 m above in Fukushima

    Takuya Kurihara, Kazuhisa Tanada, Jun Kataoka, Hiroki Hosokoshi, Saku Mochizuki, Leo Tagawa, Hiroshi Okochi, Yurie Gotoh

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   978  2020年10月

    　概要を見る

    After the Fukushima nuclear disaster in 2011, large amounts of radioisotopes (mainly 137Cs and 134Cs) were released into the environment. Various monitoring activities have revealed radiation on the ground both in local and wide areas; however, aerial dose variation in the vertical direction is poorly known. This paper presents the results of airborne gamma-ray spectroscopy of a contamination field in Namie, Fukushima, as measured from 0 m to 150 m above the ground by drone. We found that the gamma-ray dose rate measured at 100 m height is about seven times higher than that expected based on ground measurements, which is caused by two factors: (1) the integrated dose includes contamination of upward scattered 662-keV gamma rays and (2) radiation from 137Cs is vertically collimated because 137Cs is buried in the soil. We also propose a novel method to obtain the distribution of radioactive substances in the soil only through aerial mapping.

    DOI

    Scopus

    2
    被引用数
    (Scopus)

  • High-statistics image generation from sparse radiation images by four types of machine-learning models

    S. Sato, J. Kataoka, J. Kotoku, M. Taki, A. Oyama, L. Tagawa, K. Fujieda, F. Nishi, T. Toyoda

    Journal of Instrumentation   15 ( 10 )  2020年10月

    　概要を見る

    With the development of nuclear medicine diagnostics and treatment, the demand for image processing techniques has been increasing. Although single photon emission computed tomography (SPECT) and positron emission tomography (PET) are most common, the energy ranges they permit for imaging are limited to either below 300 keV (SPECT) or to 511 keV gamma rays (PET). Recently, Compton cameras have attracted attention, owing to their wide energy range, which stretches from a few hundred keV to several MeV. In this study, we performed Compton camera image processing using four machine-learning (ML) techniques: dictionary learning, UNet, SRGAN, and AUTOMAP. With these techniques, we tried to reduce the artifacts caused by the sparsity of statistics and improve the signal-to-noise ratio (SNR). Thus, these ML models were trained using image pairs reconstructed from high- and low-statistics images. As a result, we succeeded in generating images similar to the ground truth from low-statistics images. We argue that this technique can be applied not only to Compton camera images but also to other radiation imaging devices. As a future perspective, we mention the possibility of applying our imaging and processing technique to in vivo imaging of alpha-particle internal therapy.

    DOI

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    2
    被引用数
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  • Origin of the in-orbit instrumental background of the Hard X-ray Imager onboard Hitomi

    Kouichi Hagino, Hirokazu Odaka, Goro Sato, Tamotsu Sato, Hiromasa Suzuki, Tsunefumi Mizuno, Madoka Kawaharada, Masanori Ohno, Kazuhiro Nakazawa, Shogo B. Kobayashi, Hiroaki Murakami, Katsuma Miyake, Makoto Asai, Tatsumi Koi, Greg Madejski, Shinya Saito, Dennis H. Wright, Teruaki Enoto, Yasushi Fukazawa, Katsuhiro Hayashi, Jun Kataoka, Junichiro Katsuta, Motohide Kokubun, Philippe Laurent, François Lebrun, Olivier Limousin, Daniel Maier, Kazuo Makishima, Kunishiro Mori, Takeshi Nakamori, Toshio Nakano, Hirofumi Noda, Masayuki Ohta, Rie Sato, Hiroyasu Tajima, Hiromitsu Takahashi, Tadayuki Takahashi, Shin'Ichiro Takeda, Takaaki Tanaka, Yukikatsu Terada, Hideki Uchiyama, Yasunobu Uchiyama, Shin Watanabe, Kazutaka Yamaoka, Yoichi Yatsu, Takayuki Yuasa

    Journal of Astronomical Telescopes, Instruments, and Systems   6 ( 4 )  2020年10月

    　概要を見る

    Understanding and reducing in-orbit instrumental backgrounds are essential to achieving high sensitivity in hard x-ray astronomical observations. The observational data of the Hard X-ray Imager (HXI) onboard the Hitomi satellite provide useful information on the background components due to its multilayer configuration with different atomic numbers: The HXI consists of a stack of four layers of Si (Z = 14) detectors and one layer of cadmium telluride (CdTe) (Z = 48, 52) detector surrounded by well-Type Bi4Ge3O12 active shields. Based on the observational data, the backgrounds of the top Si layer, the three underlying Si layers, and the CdTe layer are inferred to be dominated by different components, namely, low-energy electrons, albedo neutrons, and proton-induced radioactivation, respectively. Monte Carlo simulations of the in-orbit background of the HXI reproduce the observed background spectrum of each layer well, thereby quantitatively verifying the above hypothesis. In addition, we suggest the inclusion of an electron shield to reduce the background.

    DOI

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    3
    被引用数
    (Scopus)

  • First application of the super-resolution imaging technique using a Compton camera

    S. Sato, J. Kataoka, J. Kotoku, M. Taki, A. Oyama, L. Tagawa, K. Fujieda, F. Nishi, T. Toyoda

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   969  2020年07月  [査読有り]

    　概要を見る

    © 2020 Elsevier B.V. In medical imaging, precise and reliable images are very important. However, the quality of medical images is sometimes limited by low-event statistics owing to the low sensitivity of the detectors commonly used in radiology. On the other hand, long exposure to radiation and long inspection duration can become a burden for patients. In this paper, we propose a method for generating high-quality images of gamma ray sources from low statistic data by using machine learning methods based on dictionary learning and sparse coding. As the first application, we generated a high-quality image of 137Cs, which emits 662-keV gamma rays, from low-event statistics measured using a Compton camera. We simulated with Geant4 various geometries of the gamma-ray source (137Cs; 662 keV) as measured with a Compton camera by Geant4. Then, complete sets of low-resolution and high-resolution dictionaries were prepared. We generated super-resolution images from low-resolution test images obtained from actual measurements. The convergence of the gamma-ray images was similar for both the ground truth and predicted images, as supported by the improvements in the structural similarity (SSIM), peak signal-to-noise (PSNR) ratio, and root mean square error (RMSE) in the corresponding images. We also discuss future plans to use the super-resolution technique for visualizing radium chloride (223RaCl2) in the patient's body, which will make it possible to achieve in-vivo imaging of alpha-particle internal therapy for the first time.

    DOI

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    8
    被引用数
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  • CALET on the International Space Station: The first three years of observations

    P. Brogi, P. Brogi, O. Adriani, O. Adriani, Y. Akaike, Y. Akaike, K. Asano, Y. Asaoka, Y. Asaoka, M. G. Bagliesi, M. G. Bagliesi, E. Berti, E. Berti, G. Bigongiari, G. Bigongiari, W. R. Binns, S. Bonechi, S. Bonechi, M. Bongi, M. Bongi, A. Bruno, J. H. Buckley, N. Cannady, N. Cannady, G. Castellini, C. Checchia, C. Checchia, M. L. Cherry, G. Collazuol, G. Collazuol, V. Di Felice, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. F. Krizmanic, J. Link, J. Link, P. Maestro, P. Maestro, P. S. Marrocchesi, P. S. Marrocchesi, A. M. Messineo, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, F. Palma, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, S. B. Ricciarini, K. Sakai, K. Sakai, T. Sakamoto, M. Sasaki, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, F. Stolzi, S. Sugita, J. E. Suh, J. E. Suh, A. Sulaj

    Physica Scripta   95 ( 7 )  2020年07月

    　概要を見る

    The CALorimetric Electron Telescope CALET is a space instrument designed to carry out precision measurements of high energy cosmic-rays on the JEM-EF external platform on the International Space Station, where it has been collecting science data continuously since mid October 2015. In addition to its primary goal of identifying nearby sources of high-energy electrons and possible signatures of dark matter in the electron spectrum, CALET is carrying out extensive measurements of the energy spectra, relative abundances and secondary-to-primary ratios of elements from proton to iron, and even above (up to Z = 40), studying the details of galactic particle propagation and acceleration. An overview of CALET based on the data taken during the first three years of observations is presented, including a direct measurement of the electron+positron energy spectrum from 11 GeV to 4.8 TeV. The proton spectrum has been measured from 50 GeV to 10 TeV covering, for the first time with a single space-borne instrument, the whole energy interval previously investigated in separate sub-ranges by magnetic spectrometers and calorimetric instruments. Preliminary spectra of cosmic-ray nuclei are also presented, together with gamma-ray observations and searches for an e.m. counterpart of LIGO/Virgo GW events.

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  • Development of Gamma-Ray Detector Arrays Consisting of Diced Eu-Doped SrI<inf>2</inf>Scintillator Arrays and TSV-MPPC Arrays

    M. Yoshino, M. Yoshino, K. Kamada, K. Kamada, Y. Shoji, Y. Yokota, S. Kurosawa, A. Yamaji, Y. Ohashi, H. Sato, K. Fujieda, J. Kataoka, A. Yoshikawa, A. Yoshikawa, A. Yoshikawa

    IEEE Transactions on Nuclear Science   67 ( 6 ) 999 - 1002  2020年06月  [査読有り]

    　概要を見る

    © 1963-2012 IEEE. This article presents the development of diced SrI2:Eu arrays and their scintillation properties when coupled with a multipixel photon counter (MPPC) array. Using a dicing technique specific to halide scintillators, a high-energy resolution scintillator array is developed that is cost-effective and widely applicable. The developed SrI2:Eu arrays are of 3 × 3 × 3 mm3/pixel 4 × 4 matrix (TYPE1) and 1 × 1 × 1 mm3/pixel 9 × 9 matrix (TYPE2) structures. We fabricated test gamma-ray detector modules consisting of the TYPE1 and TYPE2 arrays coupled with an MPPC array. The mean peak to valleys ratio is 85.3 ± 14.9 for the TYPE1 array and 38.5 ± 16.6 for the TYPE2 array detector. The average energy resolutions obtained for the TYPE1 and TYPE2 gamma-ray detectors were 5.4 ± 0.4% full-width at half-maximum (FWHM) and 5.2 ± 0.6% FWHM, respectively, for 662-keV gamma-rays. The variation in the signal pulse height of the TYPE1 and TYPE2 detectors was only 10.6% and 10.4% in FWHM, respectively. These results demonstrated that the dicing technique proposed in this article could be applied to hygroscopic halide scintillators.

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  • 次世代多色CTに向けた多数造影剤の撮影実証

    T.Maruhashi, H.Kiji, T.Toyoda, J.Kataoka, M.Arimoto, S.Kobayashi, H.Kawashima, S.Terazawa, S.Shiota, H.Ikeda

    Nuclear Instruments and Methods in Physics Research Section A   958  2020年04月  [査読有り]

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  • CALET results after three years on the International Space Station

    Y. Asaoka, O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. Link, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, N. Opsina, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, V. Pal'Shin, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, S. Sugita, J. E. Suh, A. Sulaj, I. Takahashi, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Journal of Physics: Conference Series   1468 ( 1 )  2020年03月

    　概要を見る

    The CALET (CALorimetric Electron Telescope) space experiment, which is currently conducting direct cosmic-ray observations onboard the International Space Station (ISS), is an all-calorimetric instrument optimized for cosmic-ray electron measurements with capability to measure hadrons and gamma-rays. Since the start of observation in October 2015, smooth and continuous operations have taken place. In this paper, we will give a brief summary of the CALET observations ranging from charged cosmic rays, gamma-rays, to space weather, while focusing on the energy spectra of electrons and protons.

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  • 次世代カラーX線CTに向けたMPPC用64チャンネル高速LSIの開発と性能評価

    佐藤 大地, 有元 誠, 吉浦 宏大龍, 川嶋 広貴, 小林 聡, 片岡 淳, 丸橋 拓也, 木地 浩章, 豊田 貴也, 池田 博一, 寺澤 慎祐, 塩田 諭

    応用物理学会学術講演会講演予稿集   2020.1   545 - 545  2020年02月

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  • 次世代型カラーX線CTにおける新64チャンネルシステムの性能実証

    豊田 貴也, 丸橋 拓也, 木地 浩章, 片岡 淳, 有本 誠, 佐藤 大地, 吉浦 宏大龍, 小林 聡, 川嶋 広貴, 寺澤 慎祐, 塩田 諭, 池田 博一

    応用物理学会学術講演会講演予稿集   2020.1   546 - 546  2020年02月

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  • Beta-ray imaging system with γ-ray coincidence for multiple-tracer imaging

    Tomonori Fukuchi, Seiichi Yamamoto, Jun Kataoka, Kei Kamada, Akira Yoshikawa, Yasuyoshi Watanabe, Shuichi Enomoto

    Medical Physics   47 ( 2 ) 587 - 596  2020年02月  [査読有り]  [国際誌]

    　概要を見る

    PURPOSE: Beta-ray imaging systems are widely used for various biological objects to obtain a two-dimensional (2D) distribution of β-ray emitting radioisotopes. However, a conventional β-ray imaging system is unsuitable for multiple-tracer imaging, because the continuous energy distribution of β-rays complicates distinguishing among different tracers by energy information. Therefore, we developed a new type of β-ray imaging system, which is useful for multiple tracers by detecting coincidence γ-rays with β-rays, and evaluated its imaging performance. METHODS: Our system is composed of position-sensitive β-ray and γ-ray detectors. The former is a 35 × 35 × 1-mm3 Ce-Doped((La, Gd)2 Si2 O7 ) (La-GPS) scintillation detector, which has a 300-µm pitch of pixels. The latter is a 43 × 43 × 16-mm3 bismuth germanium oxide (BGO) scintillation detector. Both detectors are mounted on a flexible frame and placed in a user-selectable position. We experimentally evaluated the performance of the β-ray detector and the γ-ray efficiencies of the γ-ray detector with different energies, positions, and distances. We also conducted point sources and phantom measurements with dual isotopes to evaluate the system performance of multiple-tracer imaging. RESULTS: For the β-ray detector, the β-ray detection efficiencies for 45 Ca (245-keV maximum energy) and 90 Sr/90 Y (545 and 2280-keV maximum energy) were 14.3% and 21.9%, respectively. The total γ-ray detection efficiency of the γ-ray detector for all γ-rays from 22 Na (511-keV annihilation γ-rays and a 1275-keV γ-ray) in the center position with a detector distance of 20 mm was 17.5%. From a point-source measurement using 22 Na and 90 Sr/90 Y, we successfully extracted the position of a positron-γ emitter 22 Na. Furthermore, for a phantom experiment using 45 Ca and 18 F or 18 F and 22 Na, we successfully extracted the distribution of the second tracer using the annihilation γ-ray or de-excitation γ-ray coincidence. In all the imaging experiments, the event counts of the extracted images were consistent with the counts estimated by the measured γ-ray efficiencies. CONCLUSIONS: We successfully demonstrated the feasibility of our β-ray autoradiography system for imaging multiple isotopes. Since our system can identify not only a β-γ emitter but also a positron emitter using the coincidence detection of annihilation γ-rays, it is useful for PET tracers and various new applications that are otherwise impractical.

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  • RI内用療法におけるコンプトンカメラを用いら223Ra集積の初実証

    藤枝 和也, 片岡 淳, 望月 早駆ほか

    Nuclear Instruments and Methods in Physics Research Section A   in press  2019年12月  [査読有り]

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  • MeVガンマ線イメージングのための3次元位置有感型コンプトンカメラの開発と実証

    細越 裕希, 片岡 淳, 望月 早駆ほか

    Nature Scientific Reports   in press ( 1 )  2019年12月  [査読有り]

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  • ガンマ線イメージングがつなぐ医療と宇宙～超小型コンプトンカメラの挑戦～

    片岡 淳

    応用物理   88 ( 11 ) 730 - 734  2019年11月  [査読有り]  [招待有り]

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  • Stable Radio Core of the Blazar Mrk 501 during High-energy Active State in 2012

    Shoko Koyama, Motoki Kino, Akihiro Doi, Kotaro Niinuma, Marcello Giroletti, David Paneque, Kazunori Akiyama, Gabriele Giovannini, Guang-Yao Zhao, Eduardo Ros, Jun Kataoka, Monica Orienti, Kazuhiro Hada, Hiroshi Nagai, Naoki Isobe, Hideyuki Kobayashi, Mareki Honma, Rocco Lico

    The Astrophysical Journal   884 ( 2 ) 132  2019年10月  [査読有り]

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  • PETを用いた陽子線治療における線量評価ためのML-EMアルゴリスム

    T.Masuda, T.Nishio, J.Kataoka, M.Arimoto, K.Karasawa

    Physics in Medicine & Biology   64 ( 17 ) 175011  2019年09月  [査読有り]

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    13
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  • 陽子線治療中の2次被ばく評価のための革新的中性子カメラの開発

    田川怜央, 片岡淳, 末岡晃紀ほか

    Nuclear Instruments and Methods in Physics Research Section A   936   31 - 33  2019年08月  [査読有り]

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    5
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  • 多色3次元イメージングのための16chMPPCアレイを用いた革新的Photon counting CT システムの評価

    丸橋拓也, 森田隼人, 片岡淳ほか

    Nuclear Instruments and Methods in Physics Research Section A   936   5 - 9  2019年08月  [査読有り]

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    16
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  • 陽子線治療オンラインモニタに向けた4.4MeV即発ガンマ線の高精度イメージング

    望月早駆, 片岡淳, 小出絢子ほか

    Nuclear Instruments and Methods in Physics Research Section A   936   43 - 45  2019年08月  [査読有り]

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    20
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  • Centaurus A kpcジェットにおける星光の逆コンプトン散乱：TeVガンマ線超過成分の起源

    棚田 和玖, 片岡 淳, 井上 芳幸

    The Astrophysical Journal   878 ( 2 ) 139 - 147  2019年06月  [査読有り]

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    15
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  • Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   122 ( 18 )  2019年05月  [査読有り]

    　概要を見る

    © 2019 authors. In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, including the detailed assessment of systematic uncertainties. The observation period used in this analysis is from October 13, 2015 to August 31, 2018 (1054 days). We have achieved the very wide energy range necessary to carry out measurements of the spectrum from 50 GeV to 10 TeV covering, for the first time in space, with a single instrument the whole energy interval previously investigated in most cases in separate subranges by magnetic spectrometers (BESS-TeV, PAMELA, and AMS-02) and calorimetric instruments (ATIC, CREAM, and NUCLEON). The observed spectrum is consistent with AMS-02 but extends to nearly an order of magnitude higher energy, showing a very smooth transition of the power-law spectral index from-2.81±0.03 (50-500 GeV) neglecting solar modulation effects (or-2.87±0.06 including solar modulation effects in the lower energy region) to-2.56±0.04 (1-10 TeV), thereby confirming the existence of spectral hardening and providing evidence of a deviation from a single power law by more than 3σ.

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  • 散乱陽子線の革新的補正方法を適用した簡単かつ革新的陽子線CTシステムの開発

    高部美帆, 増田孝充, 有元誠, 片岡淳, 末岡晃紀, 丸橋拓也, 田中創大, 西尾禎治, 歳藤利行, 木村充宏, 稲庭拓

    Nuclear Instruments and Methods in Physics Research A   924   332 - 338  2019年04月  [査読有り]

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  • 0.1x0.1mmGAGGプレートシンチレータアレイと1mm角Si-PMを用いた超解像度放射線イメージング検出器

    山本誠一, 片岡淳, 鎌田圭, 吉川彰

    Nuclear Instruments and Methods in Physics Research, Section A   919   125 - 133  2019年03月  [査読有り]

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  • PoGO+を用いた白鳥座X-1 シンクロトロンジェット放射への偏光による制限

    Chauvin,M, Florén, Hans-Gustav, Jackson, M

    Monthly Notices of the Royal Astronomical Society: Letters,   483 ( 1 ) 138 - 143  2019年02月  [査読有り]

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  • 革新的ガンマ線イメージングに向けた超小型コンプトンカメラ

    片岡 淳, 岸本 彩, 多屋 隆紀ほか

    Nuclear Instruments and Methods in Physics Research Section A   912   1 - 5  2018年12月  [査読有り]

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  • Correction: Shedding new light on the crab with polarized X-rays (Scientific Reports DOI: 10.1038/s41598-017-07390-7)

    M. Chauvin, H. G. Florén, M. Friis, M. Jackson, T. Kamae, J. Kataoka, T. Kawano, M. Kiss, V. Mikhalev, T. Mizuno, N. Ohashi, T. Stana, H. Tajima, H. Takahashi, N. Uchida, M. Pearce

    Scientific Reports   8 ( 1 )  2018年12月

    　概要を見る

    This Article contains a typographical error in the legend of Figure 2. "Gaussian 1, 2 and 3& #x1D70E;" should read: "Gaussian 1, 2 and 3σ".

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  • Detection of polarized gamma-ray emission from the Crab nebula with the Hitomi Soft Gamma-ray Detector

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller, Shin Mineshige

    Publications of the Astronomical Society of Japan   70 ( 6 )  2018年12月

    　概要を見る

    We present the results from the Hitomi Soft Gamma-ray Detector (SGD) observation of the Crab nebula. The main part of SGD is a Compton camera, which in addition to being a spectrometer, is capable of measuring polarization of gamma-ray photons. The Crab nebula is one of the brightest X-ray/gamma-ray sources on the sky, and the only source from which polarized X-ray photons have been detected. SGD observed the Crab nebula during the initial test observation phase of Hitomi. We performed data analysis of the SGD observation, SGD background estimation, and SGD Monte Carlo simulations and successfully detected polarized gamma-ray emission from the Crab nebula with only about 5 ks exposure time. The obtained polarization fraction of the phase-integrated Crab emission (sum of pulsar and nebula emissions) is (22.1%±10.6%), and the polarization angle is 110°.7 + 13°.2/-13°.0 in the energy range of 60.160 keV (the errors correspond to the 1 σ deviation). The confidence level of the polarization detection was 99.3%. The polarization angle measured by SGD is about one sigma deviation with the projected spin axis of the pulsar, 124°.0 ± 0°.0.1.

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  • 高精度陽子線治療に向けた、チェレンコフ光を用いた核反応断面積の精密測定

    増田 孝充, 片岡 淳, 有元 誠ほか

    Nature Scientific Reports   8 ( 1 ) 2570  2018年12月  [査読有り]

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    26
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  • 3次元位置有感型コンプトンカメラを用いた4.4MeVガンマ線の高精度測定

    小出 絢子, 片岡 淳, 増田 孝充ほか

    Nature Scientific Reports   8 ( 1 ) 8116  2018年12月  [査読有り]

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    43
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  • Characteristics and Performance of the CALorimetric Electron Telescope (CALET) Calorimeter for Gamma-Ray Observations

    N. Cannady, Y. Asaoka, F. Satoh, M. Tanaka, S. Torii, M. L. Cherry, M. Mori, O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, G. Castellini, C. Checchia, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A.De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Astrophysical Journal, Supplement Series   238 ( 1 )  2018年09月

    　概要を見る

    The CALorimetric Electron Telescope primary detector (CALET-CAL) is a 30 radiation-length-deep hybrid calorimeter designed for the accurate measurement of high-energy cosmic rays. It is capable of triggering on and giving near complete containment of electromagnetic showers from primary electrons and gamma rays from 1 GeV to over 10 TeV. The first 24 months of on-orbit scientific data (2015 November 01-2017 October 31) provide valuable characterization of the performance of the calorimeter based on analyses of the gamma-ray data set in general and bright point sources in particular. We describe the gamma-ray analysis, the expected performance of the calorimeter based on Monte Carlo simulations, the agreement of the flight data with the simulated results, and the outlook for long-term gamma-ray observations with the CAL.

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  • Search for GeV Gamma-Ray Counterparts of Gravitational Wave Events by CALET

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. S. Krawczynski, J. F. Krizmanic, K. Kohri, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Astrophysical Journal   863 ( 2 )  2018年08月  [査読有り]

    　概要を見る

    © 2018. The American Astronomical Society. All rights reserved. We present the results of searches for gamma-ray counterparts of the LIGO/Virgo gravitational wave events using CALorimetric Electron Telescope (CALET) observations. The main instrument of CALET, CALorimeter (CAL), observes gamma-rays from ∼1 GeV up to 10 TeV with a field of view (FOV) of nearly 2 sr. In addition, the CALET gamma-ray burst monitor views ∼3 sr and ∼2π sr of the sky in the 7 keV-1 MeV and the 40 keV-20 MeV bands, respectively, by using two different crystal scintillators. The CALET observations on the International Space Station started in 2015 October, and here we report analyses of events associated with the following gravitational wave events: GW151226, GW170104, GW170608, GW170814, and GW170817. Although only upper limits on gamma-ray emission are obtained, they correspond to a luminosity of 1049 ∼ 1053 erg s-1 in the GeV energy band depending on the distance and the assumed time duration of each event, which is approximately on the order of luminosity of typical short gamma-ray bursts. This implies that there will be a favorable opportunity to detect high-energy gamma-ray emission in further observations if additional gravitational wave events with favorable geometry will occur within our FOV. We also show the sensitivity of CALET for gamma-ray transient events, which is on the order of 10-7 erg cm-2 s-1 for an observation of 100 s in duration.

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  • 硬X線偏光をもちいたブラックホール連星Cyg X-1 の降着構造の観測

    M.Chauvin, G.Floren, M.Jackson

    Nature Astronomy   2 ( 8 ) 652 - 655  2018年08月  [査読有り]

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  • Spatial Distribution of the Milky Way Hot Gaseous Halo Constrained by Suzaku X-Ray Observations

    Shinya Nakashima, Yoshiyuki Inoue, Noriko Yamasaki, Yoshiaki Sofue, Jun Kataoka, Kazuhiro Sakai

    Astrophysical Journal   862 ( 1 )  2018年07月

    　概要を見る

    The formation mechanism of the hot gaseous halo associated with the Milky Way is still under debate. We report new observational constraints on the gaseous halo using 107 lines of sight of the Suzaku X-ray observations at 75°< l < 285° and with a total exposure of 6.4 Ms. The gaseous halo spectra are represented by a singleerature plasma model in collisional ionization equilibrium. The median temperature of the observed fields is 0.26 keV (3.0 × 106 K) with a typical fluctuation of ∼30%. The emission measure varies by an order of magnitude and marginally correlates with the Galactic latitude. Despite the large scatter of the data, the emission measure distribution is roughly reproduced by a disk-like density distribution with a scale length of ∼7 kpc, a scale height of ∼2 kpc, and a total mass of ∼5 × 107 M. In addition, we found that a spherical hot gas with the β-model profile hardly contributes to the observed X-rays but that its total mass might reach 109 M. Combined with indirect evidence of an extended gaseous halo from other observations, the hot gaseous halo likely consists of a dense disk-like component and a rarefied spherical component; the X-ray emissions primarily come from the former, but the mass is dominated by the latter. The disk-like component likely originates from stellar feedback in the Galactic disk due to the low scale height and the large scatter of the emission measures. The median [O/Fe] of ∼0.25 shows the contribution of the core-collapse supernovae and supports the stellar feedback origin.

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  • すざく衛星を用いた、ループI構造北部からの拡散X線観測

    秋田 誠博, 片岡 淳, 有元 誠ほか

    Astrophysical Journal   862 ( 1 ) 88  2018年07月  [査読有り]

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  • On-orbit operations and offline data processing of CALET onboard the ISS

    Y. Asaoka, S. Ozawa, S. Torii, O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, A. Javaid, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. S. Krawczynski, J. F. Krizmanic, S. Kuramata, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Astroparticle Physics   100   29 - 37  2018年07月

    　概要を見る

    The CALorimetric Electron Telescope (CALET), launched for installation on the International Space Station (ISS) in August, 2015, has been accumulating scientific data since October, 2015. CALET is intended to perform long-duration observations of high-energy cosmic rays onboard the ISS. CALET directly measures the cosmic-ray electron spectrum in the energy range of 1 GeV to 20 TeV with a 2% energy resolution above 30 GeV. In addition, the instrument can measure the spectrum of gamma rays well into the TeV range, and the spectra of protons and nuclei up to a PeV. In order to operate the CALET onboard ISS, JAXA Ground Support Equipment (JAXA-GSE) and the Waseda CALET Operations Center (WCOC) have been established at JAXA and Waseda University, respectively. Scientific operations using CALET are planned at WCOC, taking into account orbital variations of geomagnetic rigidity cutoff. Scheduled command sequences are used to control the CALET observation modes on orbit. Calibration data acquisition by, for example, recording pedestal and penetrating particle events, a low-energy electron trigger mode operating at high geomagnetic latitude, a low-energy gamma-ray trigger mode operating at low geomagnetic latitude, and an ultra heavy trigger mode, are scheduled around the ISS orbit while maintaining maximum exposure to high-energy electrons and other high-energy shower events by always having the high-energy trigger mode active. The WCOC also prepares and distributes CALET flight data to collaborators in Italy and the United States. As of August 31, 2017, the total observation time is 689 days with a live time fraction of the total time of ∼ 84%. Nearly 450 million events are collected with a high-energy (E > 10 GeV) trigger. In addition, calibration data acquisition and low-energy trigger modes, as well as an ultra-heavy trigger mode, are consistently scheduled around the ISS orbit. By combining all operation modes with the excellent-quality on-orbit data collected thus far, it is expected that a five-year observation period will provide a wealth of new and interesting results.

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  • Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   120 ( 26 )  2018年06月  [査読有り]

    　概要を見る

    © 2018 American Physical Society. Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the International Space Station utilizing the data up to November 2017. The analysis uses the full detector acceptance at high energies, approximately doubling the statistics compared to the previous result. CALET is an all-calorimetric instrument with a total thickness of 30 X0 at normal incidence and fine imaging capability, designed to achieve large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum in the region below 1 TeV shows good agreement with Alpha Magnetic Spectrometer (AMS-02) data. In the energy region below ∼300 GeV, CALET's spectral index is found to be consistent with the AMS-02, Fermi Large Area Telescope (Fermi-LAT), and Dark Matter Particle Explorer (DAMPE), while from 300 to 600 GeV the spectrum is significantly softer than the spectra from the latter two experiments. The absolute flux of CALET is consistent with other experiments at around a few tens of GeV. However, it is lower than those of DAMPE and Fermi-LAT with the difference increasing up to several hundred GeV. The observed energy spectrum above ∼1 TeV suggests a flux suppression consistent within the errors with the results of DAMPE, while CALET does not observe any significant evidence for a narrow spectral feature in the energy region around 1.4 TeV. Our measured all-electron flux, including statistical errors and a detailed breakdown of the systematic errors, is tabulated in the Supplemental Material in order to allow more refined spectral analyses based on our data.

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  • フェルミ衛星の8年データを用いたNGC1275からのガンマ線フラックス変動の起源

    棚田 和玖, 片岡 淳, 有元 誠ほか

    The Astrophysical Journal   860 ( 1 ) 74  2018年06月  [査読有り]

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  • Hitomi X-ray observation of the pulsar wind nebula G21.5-0.9

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller, Shin Mineshige

    Publications of the Astronomical Society of Japan   70 ( 3 )  2018年06月

    　概要を見る

    We present results from the Hitomi X-ray observation of a young composite-type supernova remnant (SNR) G21.5-0.9, whose emission is dominated by the pulsar wind nebula (PWN) contribution. The X-ray spectra in the 0.8-80 keV range obtained with the Soft X-ray Spectrometer (SXS), Soft X-ray Imager, and Hard X-ray Imager (HXI) show a significant break in the continuum as previously found with the NuSTAR observation. After taking into account all known emissions from the SNR other than the PWN itself, we find that the Hitomi spectra can be fitted with a broken power law with photon indices of 1 = 1.74 ± 0.02 and 2 = 2.14 ± 0.01 below and above the break at 7.1 ± 0.3 keV, which is significantly lower than the NuSTAR result (∼9.0 keV). The spectral break cannot be reproduced by time-dependent particle injection one-zone spectral energy distribution models, which strongly indicates that a more complex emission model is needed, as suggested by recent theoretical models. We also search for narrow emission or absorption lines with the SXS, and perform a timing analysis of PSR J1833-1034 with the HXI and the Soft Gamma-ray Detector. No significant pulsation is found from the pulsar. However, unexpectedly, narrow absorption line features are detected in the SXS data at 4.2345 keV and 9.296 keV with a significance of 3.65 s. While the origin of these features is not understood, their mere detection opens up a new field of research and was only possible with the high resolution, sensitivity, and ability to measure extended sources provided by an X-ray microcalorimeter.

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  • 1mm角MPPCアレイと0.2mmピッチGAGGプレートを用いた超解像度放射線イメージャの開発

    山本 誠一, 片岡 淳, 福地 知則ほか

    Journal of Instrumentation   13 ( 5 ) P05028  2018年05月

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  • Modeling of proton-induced radioactivation background in hard X-ray telescopes: Geant4-based simulation and its demonstration by Hitomi's measurement in a low Earth orbit

    Odaka Hirokazu, Asai Makoto, Hagino Kouichi, Koi Tatsumi, Madejski Greg, Mizuno Tsunefumi, Ohno Masanori, Saito Shinya, Sato Tamotsu, Wright Dennis H, Enoto Teruaki, Fukazawa Yasushi, Hayashi Katsuhiro, Kataoka Jun, Katsuta Junichiro, Kawaharada Madoka, Kobayashi Shogo B, Kokubun Motohide, Laurent Philippe, Lebrun Francois, Limousin Olivier, Maier Daniel, Makishima Kazuo, Mimura Taketo, Miyake Katsuma, Mori Kunishiro, Murakami Hiroaki, Nakamori Takeshi, Nakano Toshio, Nakazawa Kazuhiro, Noda Hirofumi, Ohta Masayuki, Ozaki Masanobu, Sato Goro, Sato Rie, Tajima Hiroyasu, Takahashi Hiromitsu, Takahashi Tadayuki, Takeda Shin'ichiro, Tanaka Takaaki, Tanaka Yasuyuki, Terada Yukikatsu, Uchiyama Hideki, Uchiyama Yasunobu, Watanabe Shin, Yamaoka Kazutaka, Yasuda Tetsuya, Yatsu Yoichi, Yuasa Takayuki, Zoglauer Andreas

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   891   92 - 105  2018年05月  [査読有り]

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  • In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)

    Kouichi Hagino, Kazuhiro Nakazawa, Goro Sato, Motohide Kokubun, Teruaki Enoto, Yasushi Fukazawa, Katsuhiro Hayashi, Jun Kataoka, Junichiro Katsuta, Shogo B. Kobayashi, Philippe Laurent, Francois Lebrun, Olivier Limousin, Daniel Maier, Kazuo Makishima, Taketo Mimura, Katsuma Miyake, Tsunefumi Mizuno, Kunishiro Mori, Hiroaki Murakami, Takeshi Nakamori, Toshio Nakano, Hirofumi Noda, Hirokazu Odaka, Masanori Ohno, Masayuki Ohta, Shinya Saito, Rie Sato, Hiroyasu Tajima, Hiromitsu Takahashi, Tadayuki Takahashi, Shin'ichiro Takeda, Takaaki Tanaka, Yukikatsu Terada, Hideki Uchiyama, Yasunobu Uchiyama, Shin Watanabe, Kazutaka Yamaoka, Yoichi Yatsu, Takayuki Yuasa

    Journal of Astronomical Telescopes, Instruments, and Systems   4 ( 2 )  2018年04月

    　概要を見る

    The Hard X-ray Imager (HXI) onboard Hitomi (ASTRO-H) is an imaging spectrometer covering hard x-ray energies of 5 to 80 keV. Combined with the Hard X-ray Telescope, it enables imaging spectroscopy with an angular resolution of 10.7 half-power diameter, in a field of view of 9' × 9'. The main imager is composed of four layers of Si detectors and one layer of CdTe detector, stacked to cover a wide energy band up to 80 keV, surrounded by an active shield made of Bi4Ge3O12 scintillator to reduce the background. The HXI started observations 12 days before the Hitomi loss and successfully obtained data from G21.5-0.9, Crab, and blank sky. Utilizing these data, we calibrate the detector response and study properties of in-orbit background. The observed Crab spectra agree well with a powerlaw model convolved with the detector response, within 5% accuracy. We find that albedo electrons in specified orbit strongly affect the background of the Si top layer and establish a screening method to reduce it. The background level over the full field of view after all the processing and screening is as low as the preflight requirement of 1 - 3 × 10-4 counts s-1 cm-2 keV-1.

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  • Design and performance of Soft Gamma-ray Detector onboard the Hitomi (ASTRO-H) satellite

    Tajima Hiroyasu, Watanabe Shin, Fukazawa Yasushi, Blandford Roger, Enoto Teruaki, Goldwurm Andrea, Hagino Kouichi, Hayashi Katsuhiro, Ichinohe Yuto, Kataoka Jun, Katsuta Jun'ichiro, Kitaguchi Takao, Kokubun Motohide, Laurent Philippe, Lebrun Francois, Limousin Olivier, Madejski Grzegorz M, Makishima Kazuo, Mizuno Tsunefumi, Mori Kunishiro, Nakamori Takeshi, Nakano Toshio, Nakazawa Kazuhiro, Noda Hirofumi, Odaka Hirokazu, Ohno Masanori, Ohta Masayuki, Saito Shinya, Sato Goro, Sato Rie, Takeda Shin'ichiro, Takahashi Hiromitsu, Takahashi Tadayuki, Tanaka Takaaki, Tanaka Yasuyuki, Terada Yukikatsu, Uchiyama Hideki, Uchiyama Yasunobu, Yamaoka Kazutaka, Yatsu Yoichi, Yonetoku Daisuke, Yuasao Takayuki

    JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS   4 ( 2 )  2018年04月  [査読有り]

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  • Hard x-ray imager onboard Hitomi (ASTRO-H)

    Nakazawa Kazuhiro, Sato Goro, Kokubun Motohide, Enoto Teruaki, Fukazawa Yasushi, Hagino Kouichi, Hayashi Katsuhiro, Kataoka Jun, Katsuta Junichiro, Kobayashi Shogo B, Laurent Philippe, Lebrun Francois, Limousin Olivier, Maier Daniel, Makishima Kazuo, Mizuno Tsunefumi, Mori Kunishiro, Nakamori Takeshi, Nakano Toshio, Noda Hirofumi, Odaka Hirokazu, Ohno Masanori, Ohta Masayuki, Saito Shinya, Sato Rie, Tajima Hiroyasu, Takahashi Hiromitsu, Takahashi Tadayuki, Takeda Shin'ichiro, Tanaka Takaaki, Terada Yukikatsu, Uchiyama Hideki, Uchiyama Yasunobu, Watanabe Shin, Yamaoka Kazutaka, Yatsu Yoichi, Yuasa Takayuki

    JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS   4 ( 2 )  2018年04月  [査読有り]

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  • Hitomi observation of radio galaxy NGC 1275: The first X-ray microcalorimeter spectroscopy of Fe-Kα line emission from an active galactic nucleus

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier O. Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller, Shin Mineshige

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    The origin of the narrow Fe-Kα fluorescence line at 6.4 keV from active galactic nuclei has long been under debate; some of the possible sites are the outer accretion disk, the broad line region, a molecular torus, or interstellar/intracluster media. In 2016 February-March, we performed the first X-ray microcalorimeter spectroscopy with the Soft X-ray Spectrometer (SXS) on board the Hitomi satellite of the Fanaroff-Riley type I radio galaxy NGC 1275 at the center of the Perseus cluster of galaxies. With the high-energy resolution of ∼5 eV at 6 keV achieved by Hitomi/SXS, we detected the Fe-Kα line with ∼5.4 σ significance. The velocity width is constrained to be 500-1600 km s−1 (FWHM for Gaussian models) at 90% confidence. The SXS also constrains the continuum level from the NGC 1275 nucleus up to ∼20 keV, giving an equivalent width of ∼20 eV for the 6.4 keV line. Because the velocity width is narrower than that of the broad Hα line of ∼2750 km s−1, we can exclude a large contribution to the line flux from the accretion disk and the broad line region. Furthermore, we performed pixel map analyses on the Hitomi/SXS data and image analyses on the Chandra archival data, and revealed that the Fe-Kα line comes from a region within ∼1.6 kpc of the NGC 1275 core, where an active galactic nucleus emission dominates, rather than that from intracluster media. Therefore, we suggest that the source of the Fe-Kα line from NGC 1275 is likely a low-covering-fraction molecular torus or a rotating molecular disk which probably extends from a parsec to hundreds of parsecs scale in the active galactic nucleus system.

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  • Search for thermal X-ray features from the Crab nebula with the Hitomi soft X-ray spectrometer

    Takashi J. Moriya, Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan Mccammon, Brian R. Mcnamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller, Shin Mineshige

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    The Crab nebula originated from a core-collapse supernova (SN) explosion observed in 1054AD. When viewed as a supernova remnant (SNR), it has an anomalously low observed ejecta mass and kinetic energy for an Fe-core-collapse SN. Intensive searches have been made for a massive shell that solves this discrepancy, but none has been detected. An alternative idea is that SN 1054 is an electron-capture (EC) explosion with a lower explosion energy by an order of magnitude than Fe-core-collapse SNe. X-ray imaging searches were performed for the plasma emission from the shell in the Crab outskirts to set a stringent upper limit on the X-ray emitting mass. However, the extreme brightness of the source hampers access to its vicinity. We thus employed spectroscopic technique using the X-ray micro-calorimeter on board the Hitomi satellite. By exploiting its superb energy resolution, we set an upper limit for emission or absorption features from as yet undetected thermal plasma in the 2-12keV range. We also re-evaluated the existing Chandra and XMM-Newton data. By assembling these results, a new upper limit was obtained for the X-ray plasma mass of < 1 M⊙ for a wide range of assumed shell radius, size, and plasma temperature values both in and out of collisional equilibrium. To compare with the observation, we further performed hydrodynamic simulations of the Crab SNR for two SN models (Fe-core versus EC) under two SN environments (uniform interstellar medium versus progenitor wind). We found that the observed mass limit can be compatible with both SN models if the SN environment has a low density of < 0.03 cm-3 (Fe core) or < 0.1 cm-3 (EC) for the uniform density, or a progenitor wind density somewhat less than that provided by a mass loss rate of 10-5M⊙ yr-1 at 20 km s-1for the wind environment.

    DOI

    Scopus

    5
    被引用数
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  • Glimpse of the highly obscured HMXB IGR J16318-4848 with Hitomi

    Steven W. Alle, Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier O. Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan Mccammon, Brian R. Mcnamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    We report on a Hitomi observation of IGRJ16318-4848, a high-mass X-ray binary system with an extremely strong absorption of NH ∼ 1024cm 2. Previous X-ray studies revealed that its spectrum is dominated by strong fluorescence lines of Fe as well as continuum emission lines. For physical and geometrical insight into the nature of the reprocessing material, we utilized the high spectroscopic resolving power of the X-ray microcalorimeter (the soft X-ray spectrometer: SXS) and the wide-band sensitivity by the soft and hard X-ray imagers (SXI and HXI) aboard Hitomi. Even though the photon counts are limited due to unintended off-axis pointing, the SXS spectrum resolves Fe Kα1 and Kα2 lines and puts strong constraints on the line centroid and line width. The line width corresponds to a velocity of 160+-37000 km s-1. This represents the most accurate, and smallest, width measurement of this line made so far from the any X-ray binary, much less than the Doppler broadening and Doppler shift expected from speeds that are characteristic of similar systems. Combined with the K-shell edge energy measured by the SXI and HXI spectra, the ionization state of Fe is estimated to be in the range of Fe I-IV. Considering the estimated ionization parameter and the distance between the X-ray source and the absorber, the density and thickness of the materials are estimated. The extraordinarily strong absorption and the absence of a Compton shoulder component have been confirmed. These characteristics suggest reprocessing materials that are distributed in a narrow solid angle or scattering, primarily by warm free electrons or neutral hydrogen. This measurement was achieved using the SXS detection of 19 photons. It provides strong motivation for follow-up observations of this and other X-ray binaries using the X-ray Astrophysics Recovery Mission and other comparable future instruments.

    DOI

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    6
    被引用数
    (Scopus)

  • Hitomi X-ray studies of giant radio pulses from the Crab pulsar

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, L. E.E. Shiu-Hang, Maurice A. Leutenegger, Olivier O. Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller, Shin Mineshige

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    To search for giant X-ray pulses correlated with the giant radio pulses (GRPs) from the Crab pulsar, we performed a simultaneous observation of the Crab pulsar with the X-ray satellite Hitomi in the 2-300 keV band and the Kashima NICT radio telescope in the 1.4-1.7 GHz band with a net exposure of about 2 ks on 2016 March 25, just before the loss of the Hitomi mission. The timing performance of the Hitomi instruments was confirmed to meet the timing requirement and about 1000 and 100 GRPs were simultaneously observed at the main pulse and inter-pulse phases, respectively, and we found no apparent correlation between the giant radio pulses and the X-ray emission in either the main pulse or inter-pulse phase. All variations are within the 2 σ fluctuations of the X-ray fluxes at the pulse peaks, and the 3 σ upper limits of variations of main pulse or inter-pulse GRPs are 22% or 80% of the peak flux in a 0.20 phase width, respectively, in the 2-300 keV band. The values for main pulse or inter-pulse GRPs become 25% or 110%, respectively, when the phase width is restricted to the 0.03 phase. Among the upper limits from the Hitomi satellite, those in the 4.5-10 keV and 70-300 keV bands are obtained for the first time, and those in other bands are consistent with previous reports. Numerically, the upper limits of the main pulse and inter-pulse GRPs in the 0.20 phase width are about (2.4 and 9.3) × 10−11 erg cm−2, respectively. No significant variability in pulse profiles implies that the GRPs originated from a local place within the magnetosphere. Although the number of photon-emitting particles should temporarily increase to account for the brightening of the radio emission, the results do not statistically rule out variations correlated with the GRPs, because the possible X-ray enhancement may appear due to a >0.02% brightening of the pulse-peak flux under such conditions.

  • Measurements of resonant scattering in the Perseus Cluster core with Hitomi SXS

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Maki Furukawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier O. Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    Thanks to its high spectral resolution (∼5 eV at 6 keV), the Soft X-ray Spectrometer (SXS) on board Hitomi enables us to measure the detailed structure of spatially resolved emission lines from highly ionized ions in galaxy clusters for the first time. In this series of papers, using the SXS we have measured the velocities of gas motions, metallicities and the multi-temperature structure of the gas in the core of the Perseus Cluster. Here, we show that when inferring physical properties from line emissivities in systems like Perseus, the resonant scattering effect should be taken into account. In the Hitomi waveband, resonant scattering mostly affects the Fe XXV Heα line (w)-the strongest line in the spectrum. The flux measured by Hitomi in this line is suppressed by a factor of ∼1.3 in the inner ∼30 kpc, compared to predictions for an optically thin plasma; the suppression decreases with the distance from the center. The w line also appears slightly broader than other lines from the same ion. The observed distortions of the w line flux, shape, and distance dependence are all consistent with the expected effect of the resonant scattering in the Perseus core. By measuring the ratio of fluxes in optically thick (w) and thin (Fe XXV forbidden, Heβ, Lyα) lines, and comparing these ratios with predictions from Monte Carlo radiative transfer simulations, the velocities of gas motions have been obtained. The results are consistent with the direct measurements of gas velocities from line broadening described elsewhere in this series, although the systematic and statistical uncertainties remain significant. Further improvements in the predictions of line emissivities in plasma models, and deeper observations with future X-ray missions offering similar or better capabilities to the Hitomi SXS, will enable resonant scattering measurements to provide powerful constraints on the amplitude and anisotropy of cluster gas motions.

    DOI

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    19
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  • Hitomi observations of the LMC SNR N 132 D: Highly redshifted X-ray emission from iron ejecta

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller, Shin Mineshige

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    We present Hitomi observations of N 132 D, a young, X-ray bright, O-rich core-collapse supernova remnant in the Large Magellanic Cloud (LMC). Despite a very short observation of only 3.7 ks, the Soft X-ray Spectrometer (SXS) easily detects the line complexes of highly ionized S K and Fe K with 16-17 counts in each. The Fe feature is measured for the first time at high spectral resolution. Based on the plausible assumption that the Fe K emission is dominated by He-like ions, we find that the material responsible for this Fe emission is highly redshifted at ∼ 800 km s−1 compared to the local LMC interstellar medium (ISM), with a 90% credible interval of 50-1500 km s−1 if a weakly informative prior is placed on possible line broadening. This indicates (1) that the Fe emission arises from the supernova ejecta, and (2) that these ejecta are highly asymmetric, since no blueshifted component is found. The S K velocity is consistent with the local LMC ISM, and is likely from swept-up ISM material. These results are consistent with spatial mapping that shows the He-like Fe concentrated in the interior of the remnant and the S tracing the outer shell. The results also show that even with a very small number of counts, direct velocity measurements from Doppler-shifted lines detected in extended objects like supernova remnants are now possible. Thanks to the very low SXS background of ∼ 1 event per spectral resolution element per 100 ks, such results are obtainable during short pointed or slew observations with similar instruments. This highlights the power of high-spectral-resolution imaging observations, and demonstrates the new window that has been opened with Hitomi and will be greatly widened with future missions such as the X-ray Astronomy Recovery Mission (XARM) and Athena.

    DOI

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    5
    被引用数
    (Scopus)

  • Temperature structure in the Perseus cluster core observed with Hitomi

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Maki Furukawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Yuichi Kato, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    The present paper explains the temperature structure of X-ray emitting plasma in the core of the Perseus cluster based on 1.8-20.0 keV data obtained with the Soft X-ray Spectrometer (SXS) on board the Hitomi Observatory. A series of four observations was carried out, with a total effective exposure time of 338 ks that covered a central region of ∼7 in diameter. SXS was operated with an energy resolution of ∼5 eV (full width at half maximum) at 5.9 keV. Not only fine structures of K-shell lines in He-like ions, but also transitions from higher principal quantum numbers were clearly resolved from Si through Fe. That enabled us to perform temperature diagnostics using the line ratios of Si, S, Ar, Ca, and Fe, and to provide the first direct measurement of the excitation temperature and ionization temperature in the Perseus cluster. The observed spectrum is roughly reproduced by a single-temperature thermal plasma model in collisional ionization equilibrium, but detailed line-ratio diagnostics reveal slight deviations from this approximation. In particular, the data exhibit an apparent trend of increasing ionization temperature with the atomic mass, as well as small differences between the ionization and excitation temperatures for Fe, the only element for which both temperatures could be measured. The best-fit two-temperature models suggest a combination of 3 and 5 keV gas, which is consistent with the idea that the observed small deviations from a single-temperature approximation are due to the effects of projecting the known radial temperature gradient in the cluster core along the line of sight. A comparison with the Chandra/ACIS and the XMM-Newton/RGS results, on the other hand, suggests that additional lower-temperature components are present in the intracluster medium (ICM), but not detectable with Hitomi/SXS giving its 1.8-20 keV energy band.

    DOI

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    15
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    (Scopus)

  • Atmospheric gas dynamics in the Perseus cluster observed with Hitomi

    Felix Aharonia, Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Rebecca E.A. Canning, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Tasuku Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Shota Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan Mccammon, Brian R. Mcnamara

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    Extending the earlier measurements reported in Hitomi collaboration (2016, Nature, 535, 117), we examine the atmospheric gas motions within the central 100kpc of the Perseus cluster using observations obtained with the Hitomi satellite. After correcting for the point spread function of the telescope and using optically thin emission lines, we find that the line-of-sight velocity dispersion of the hot gas is remarkably low and mostly uniform. The velocity dispersion reaches a maxima of approximately 200 km s-1 toward the central active galactic nucleus (AGN) and toward the AGN inflated northwestern "ghost" bubble. Elsewhere within the observed region, the velocity dispersion appears constant around 100 km s-1. We also detect a velocity gradient with a 100 km s-1 amplitude across the cluster core, consistent with large-scale sloshing of the core gas. If the observed gas motions are isotropic, the kinetic pressure support is less than 10% of the thermal pressure support in the cluster core. The well-resolved, optically thin emission lines have Gaussian shapes, indicating that the turbulent driving scale is likely below 100 kpc, which is consistent with the size of the AGN jet inflated bubbles. We also report the first measurement of the ion temperature in the intracluster medium, which we find to be consistent with the electron temperature. In addition, we present a new measurement of the redshift of the brightest cluster galaxy NGC 1275.

  • Atomic data and spectral modeling constraints from high-resolution X-ray observations of the Perseus cluster with Hitomi

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Cor P. De Vries, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Natalie Hell, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu Hang Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller

    Publications of the Astronomical Society of Japan   70 ( 2 )  2018年03月

    　概要を見る

    The Hitomi Soft X-ray Spectrometer spectrum of the Perseus cluster, with ∼5 eV resolution in the 2-9 keV band, offers an unprecedented benchmark of the atomic modeling and database for hot collisional plasmas. It reveals both successes and challenges of the current atomic data and models. The latest versions of AtomDB/APEC (3.0.8), SPEX (3.03.00), and CHIANTI (8.0) all provide reasonable fits to the broad-band spectrum, and are in close agreement on best-fit temperature, emission measure, and abundances of a few elements such as Ni. For the Fe abundance, the APEC and SPEX measurements differ by 16%, which is 17 times higher than the statistical uncertainty. This is mostly attributed to the differences in adopted collisional excitation and dielectronic recombination rates of the strongest emission lines. We further investigate and compare the sensitivity of the derived physical parameters to the astrophysical source modeling and instrumental effects. The Hitomi results show that accurate atomic data and models are as important as the astrophysical modeling and instrumental calibration aspects. Substantial updates of atomic databases and targeted laboratory measurements are needed to get the current data and models ready for the data from the next Hitomi-level mission.

    DOI

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    被引用数
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  • Ｘ線およびがガンマ線を用いたフェルミ・バブルとNPS/Loop 構造の観測

    片岡 淳, 祖父江義明, 井上芳幸ほか

    Galaxies   6 ( 1 ) 27 - 46  2018年02月  [査読有り]  [招待有り]

    DOI

    Scopus

    44
    被引用数
    (Scopus)

  • 将来の宇宙科学ミッションに向けたCe:GAGGシンチレータの性能評価

    米山 昌樹, 片岡 淳, 有元 誠ほか

    Journal of Instrumentation   13 ( 2 ) P020203  2018年02月  [査読有り]

    DOI

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    50
    被引用数
    (Scopus)

  • PoGO+ によるカニ星雲のオフパルス硬X線放射の観測

    M.Chauvin, G.Floren, M.Jackson

    Monthly Notices of the Royal Astronomical Society: Letters,   477 ( 1 ) 45 - 49  2018年02月  [査読有り]

    DOI

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    13
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  • X線衛星「ひとみ」搭載軟ガンマ線検出器(SGD)によるかに星雲のガンマ線偏光観測

    渡辺 伸, 大野 雅功, 小高 裕和, 片岡 淳, 勝田 隼一郎, 北口 貴雄, 国分 紀秀, Goldwurm Andrea, 斉藤 新也, 佐藤 悟朗, 佐藤 理江, 内田 悠介, 高橋 忠幸, 高橋 弘充, 武田 伸一郎, 田中 孝明, 田中 康之, 寺田 幸功, 中澤 知洋, 中野 俊男, 中森 健之, 野田 博文, 田島 宏康, 萩野 浩一, 林 克洋, Blandford Roger, 牧島 一夫, Madejski Grzegorz, 水野 恒史, 森 國城, 谷津 陽一, 山岡 和貴, 湯浅 孝行, 深沢 泰司, 米徳 大輔, Laurent Philippe, Limousin Olivier, Lebrun François, ほかSGDチーム, 一戸 悠人, 内山 秀樹, 内山 泰伸, 榎戸 輝揚, 太田 方之

    日本物理学会講演概要集   73   492 - 492  2018年

    DOI CiNii

  • CTA報告134：CTA大口径望遠鏡搭載光電子増倍管の経年変化の研究

    櫻井 駿介, 片岡 淳, 片桐 秀明, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 澤田 真理, 永吉 勤, 砂田 裕志, 高橋 光成, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 中森 健之, 西嶋 恭司, 西山 楽, 稲田 知大, 野崎 誠也, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 吉田 龍生, Hadasch D., Mazin D., 猪目 祐介, 他 CTA-Japan consortium, 岩村 由樹, 大岡 秀行, 奥村 曉, 岡崎 奈緒, 折戸 玲子

    日本物理学会講演概要集   73 ( 0 ) 417 - 417  2018年

    DOI CiNii

  • CTA報告133：CTA大口径望遠鏡初号機の焦点面カメラ統合試験

    野崎 誠也, 片桐 秀明, 加藤 翔, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 櫻井 駿介, 稲田 知大, 澤田 真理, 砂田 裕志, 高橋 光成, 高原 大, 田中 真伸, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 猪目 祐介, 中森 健之, 永吉 勤, 西嶋 恭司, 西山 楽, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 岩村 由樹, 吉田 龍生, Hadasch D., Mazin D., 他CTA-Japan consortium, 池野 正弘, 内田 智久, 大岡 秀行, 奥村 曉, 岡崎 奈緒, 折戸 玲子, 片岡 淳

    日本物理学会講演概要集   73 ( 0 ) 416 - 416  2018年

    DOI CiNii

  • CTA報告142：CTA大口径望遠鏡初号機の焦点面カメラ統合試験(II)

    砂田 裕志, 片桐 秀明, 櫛田 淳子, 木村 颯一朗, 窪 秀利, 郡司 修一, 小山 志勇, 齋藤 隆之, 櫻井 駿介, 澤田 真理, 鈴木 萌, 稲田 知大, 高橋 光成, 高原 大, 田中 真伸, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 中森 健之, 永吉 勤, 猪目 祐介, 西嶋 恭司, 西山 楽, 野崎 誠也, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 吉田 龍生, 岩村 由樹, Hadasch Daniela, Mazin Daniel, 他CTA-Japan consortium, 大岡 秀行, 岡崎 奈緒, 奥村 曉, 折戸 玲子, 片岡 淳

    日本物理学会講演概要集   73 ( 0 ) 191 - 191  2018年

    DOI CiNii

  • Energy Spectrum of Cosmic-Ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, A. Javaid, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. S. Krawczynski, J. F. Krizmanic, S. Kuramata, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Physical Review Letters   119 ( 18 )  2017年11月

    　概要を見る

    First results of a cosmic-ray electron and positron spectrum from 10 GeV to 3 TeV is presented based upon observations with the CALET instrument on the International Space Station starting in October, 2015. Nearly a half million electron and positron events are included in the analysis. CALET is an all-calorimetric instrument with total vertical thickness of 30 X0 and a fine imaging capability designed to achieve a large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum over 30 GeV can be fit with a single power law with a spectral index of -3.152±0.016 (stat+syst). Possible structure observed above 100 GeV requires further investigation with increased statistics and refined data analysis.

    DOI PubMed

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  • Solar abundance ratios of the iron-peak elements in the Perseus cluster

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Lorella Angelini, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall W. Bautz, Roger Blandford, Laura W. Brenneman, Gregory V. Brown, Esra Bulbul, Edward M. Cackett, Maria Chernyakova, Meng P. Chiao, Paolo S. Coppi, Elisa Costantini, Jelle De Plaa, Jan-Willem den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam R. Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi C. Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana M. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, Ann Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, Jelle Kaastra, Tim Kallman, Tsuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Nobuyuki Kawai, Richard L. Kelley, Caroline A. Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Katsuji Koyama, Shu Koyama, Peter Kretschmar, Hans A. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, Shiu-Hang Lee, Maurice A. Leutenegger, Olivier Limousine, Michael Loewenstein, Knox S. Long, David Lumb, Greg Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, Dan McCammon, Brian R. McNamara, Missagh Mehdipour, Eric D. Miller, Jon M. Miller, Shin Mineshige, Kazuhisa Mitsuda, Ikuyuki Mitsuishi, Takuya Miyazawa, Tsunefumi Mizuno, Hideyuki Mori, Koji Mori, Koji Mukai, Hiroshi Murakami, Richard F. Mushotzky, Takao Nakagawa, Hiroshi Nakajima, Takeshi Nakamori, Shinya Nakashima, Kazuhiro Nakazawa, Kumiko K. Nobukawa, Masayoshi Nobukawa, Hirofumi Noda, Hirokazu Odaka, Takaya Ohashi, Masanori Ohno, Takashi Okajima, Naomi Ota, Masanobu Ozaki, Frits Paerels, StPhane Paltani, Robert Petre, Ciro Pinto, Frederick S. Porter, Katja Pottschmidt, Christopher S. Reynolds, Samar Safi-Harb, Shinya Saito, Kazuhiro Sakai, Toru Sasaki, Goro Sato, Kosuke Sato, Rie Sato, Makoto Sawada, Norbert Schartel, Peter J. Serlemitsos, Hiromi Seta, Megumi Shidatsu, Aurora Simionescu, Randall K. Smith, Yang Soong, Lukasz Stawarz, Yasuharu Sugawara, Satoshi Sugita, Andrew Szymkowiak, Hiroyasu Tajima, Hiromitsu Takahashi, Tadayuki Takahashi, Shin'ichiro Takeda, Yoh Takei, Toru Tamagawa, Takayuki Tamura, Takaaki Tanaka, Yasuo Tanaka, Yasuyuki T. Tanaka, Makoto S. Tashiro, Yuzuru Tawara, Yukikatsu Terada, Yuichi Terashima, Francesco Tombesi, Hiroshi Tomida, Yohko Tsuboi, Masahiro Tsujimoto, Hiroshi Tsunemi, Takeshi Go Tsuru, Hiroyuki Uchida, Hideki Uchiyama, Yasunobu Uchiyama, Shutaro Ueda, Yoshihiro Ueda, Shin'ichiro Uno, C. Megan Urry, Eugenio Ursino, Cor P. de Vries, Shin Watanabe, Norbert Werner, Daniel R. Wik, Dan R. Wilkins, Brian J. Williams, Shinya Yamada, Hiroya Yamaguchi, Kazutaka Yamaoka, Noriko Y. Yamasaki, Makoto Yamauchi, Shigeo Yamauchi, Tahir Yaqoob, Yoichi Yatsu, Daisuke Yonetoku, Irina Zhuravleva, Abderahmen Zoghbi

    NATURE   551 ( 7681 ) 478 - +  2017年11月  [査読有り]

    　概要を見る

    The metal abundance of the hot plasma that permeates galaxy clusters represents the accumulation of heavy elements produced by billions of supernovae(1). Therefore, X-ray spectroscopy of the intracluster medium provides an opportunity to investigate the nature of supernova explosions integrated over cosmic time. In particular, the abundance of the iron-peak elements (chromium, manganese, iron and nickel) is key to understanding how the progenitors of typical type Ia supernovae evolve and explode(2-6). Recent X-ray studies of the intracluster medium found that the abundance ratios of these elements differ substantially from those seen in the Sun(7-11), suggesting differences between the nature of type Ia supernovae in the clusters and in the Milky Way. However, because the K-shell transition lines of chromium and manganese are weak and those of iron and nickel are very close in photon energy, highresolution spectroscopy is required for an accurate determination of the abundances of these elements. Here we report observations of the Perseus cluster, with statistically significant detections of the resonance emission from chromium, manganese and nickel. Our measurements, combined with the latest atomic models, reveal that these elements have near-solar abundance ratios with respect to iron, in contrast to previous claims. Comparison between our results and modern nucleosynthesis calculations(12-14) disfavours the hypothesis that type Ia supernova progenitors are exclusively white dwarfs with masses well below the Chandrasekhar limit (about 1.4 times the mass of the Sun). The observed abundance pattern of the iron-peak elements can be explained by taking into account a combination of near-and sub-Chandrasekhar-mass type Ia supernova systems, adding to the mounting evidence that both progenitor types make a substantial contribution to cosmic chemical enrichment(5,15,16).

    DOI PubMed

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  • 超高線量化イメージングに向けた新型ピンホールカメラの開発

    末岡 晃紀, 片岡 淳, 高部 美帆ほか

    Nuclear Instruments and Methods in Physics Research Section A   912   115 - 118  2017年11月  [査読有り]

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    10
    被引用数
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  • 陽子線治療に向けた広帯域即発ガンマ線の空間分解測定

    小出 絢子, 片岡 淳, 多屋 隆紀ほか

    Nuclear Instruments and Methods in Physics Research Section A   912   24 - 28  2017年11月  [査読有り]

    DOI

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    3
    被引用数
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  • MPPCを用いたフォトンカウンティングCT用LSIの開発

    有元 誠, 森田 隼人, 片岡淳ほか

    Nuclear instruments & methods in physics research. Section A   912   186 - 190  2017年11月  [査読有り]

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    10
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  • 高精細LYSO-GAGGシンチレータとSi-PMを用いた高解像度SPECT検出器の性能評価

    中西 恒平, 山本 誠一, 片岡 淳

    Nuclear Instruments and Methods in Physics Research Section A   872 ( 11 ) 107 - 111  2017年11月  [査読有り]

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    13
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  • ドローンを用いた福島上空からのガンマ線イメージングの実証

    望月 早駆, 片岡 淳, 田川 怜央ほか

    Journal of Instrumentation   12 ( 11 ) P11014  2017年11月  [査読有り]

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    38
    被引用数
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  • Development of gamma-ray detector sensitive to source directions using GAGG(Ce) scintillators and MPPCs

    Keiki Kojima, Takeshi Nakamori, Daiki Nemoto, Shuichi Gunji, Hiroki Sato, Shigeki Ito, Sho Kato, Masao Yoshino, Yoshiyuki Usuki, Jun Kataoka

    2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016   2017-January  2017年10月  [査読有り]

    　概要を見る

    © 2016 IEEE. We have developed a simpler, smaller, and thus less expensive gamma-ray detector that can roughly determine the incident direction of a radiation source with moderate angular resolution, aiming for personal use beyond that afforded by conventional survey meters. The detector consists of six GAGG(Ce) scintillators with dimensions of 20 × 20 × 6 mm3 on each face of a 3-cm cubic lead block. Signals from each scintillator are read by a 3 × 3 mm2 Hamamatsu MPPC. We then applied χ2 fit to the observed count number set in order to determine the incident direction and set our angular accuracy goal of 22.5°. Through simulation, we injected 662 keV gamma rays uniformly from in front of the detector. We found that the R90 is distributed from 6.0° to 18.3° in all 980 directions for one-minute exposure to a 137Cs source that gives 0.15 μSv/h. Furthermore, our detector achieved the targeted value under BG intensity of 0.25 μSv/h in the experiment.

    DOI

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    3
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  • 大気球を用いたカニ星雲の硬X線偏光観測

    M.Chauvin, G.Floren, M.Fris e

    Nature Scientific Reports   7 ( 1 ) 7816  2017年08月  [査読有り]

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    34
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  • 即発ガンマ線イメージングに向けたコンプトンカメラ画像再構成法の最適化

    多屋 隆紀, 片岡 淳, 岸本 彩ほか

    Journal of Instrumentation   12 ( 7 ) P07015 - P07015  2017年07月  [査読有り]

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    21
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  • MPPCを用いた革新的低被ばくX線フォトンカウンティングCTシステムの開発

    森田 隼人, 大島 翼, 片岡 淳ほか

    Nuclear Instruments and Methods in Physics Research Section A   857 ( 11 ) 58 - 65  2017年06月  [査読有り]

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    19
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  • Energy calibration of CALET onboard the International Space Station

    Y. Asaoka, Y. Akaike, Y. Komiya, R. Miyata, S. Torii, O. Adriani, K. Asano, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, A. Javaid, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. Kitamura, H. S. Krawczynski, J. F. Krizmanic, S. Kuramata, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Astroparticle Physics   91   1 - 10  2017年05月  [査読有り]

    　概要を見る

    © 2017 The Authors In August 2015, the CALorimetric Electron Telescope (CALET), designed for long exposure observations of high energy cosmic rays, docked with the International Space Station (ISS) and shortly thereafter began to collect data. CALET will measure the cosmic ray electron spectrum over the energy range of 1 GeV to 20 TeV with a very high resolution of 2% above 100 GeV, based on a dedicated instrument incorporating an exceptionally thick 30 radiation-length calorimeter with both total absorption and imaging (TASC and IMC) units. Each TASC readout channel must be carefully calibrated over the extremely wide dynamic range of CALET that spans six orders of magnitude in order to obtain a degree of calibration accuracy matching the resolution of energy measurements. These calibrations consist of calculating the conversion factors between ADC units and energy deposits, ensuring linearity over each gain range, and providing a seamless transition between neighboring gain ranges. This paper describes these calibration methods in detail, along with the resulting data and associated accuracies. The results presented in this paper show that a sufficient accuracy was achieved for the calibrations of each channel in order to obtain a suitable resolution over the entire dynamic range of the electron spectrum measurement.

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  • 「てのひら」サイズ・コンプトンカメラを用いた多色3次元生体イメージングの実証

    岸本 彩, 片岡 淳, 多屋 隆紀ほか

    Nature Scientific Repprts   7 ( 1 ) 2110  2017年05月  [査読有り]

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  • Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster

    F. A. Aharonian, H. Akamatsu, F. Akimoto, S. W. Allen, L. Angelini, K. A. Arnaud, M. Audard, H. Awaki, M. Axelsson, A. Bamba, M. W. Bautz, R. D. Blandford, E. Bulbul, L. W. Brenneman, G. V. Brown, E. M. Cackett, M. Chernyakova, M. P. Chiao, P. Coppi, E. Costantini, J. de Plaa, J. -W. den Herder, C. Done, T. Dotani, K. Ebisawa, M. E. Eckart, T. Enoto, Y. Ezoe, A. C. Fabian, C. Ferrigno, A. R. Foster, R. Fujimoto, Y. Fukazawa, A. Furuzawa, M. Galeazzi, L. C. Gallo, P. Gandhi, M. Giustini, A. Goldwurm, L. Gu, M. Guainazzi, Y. Haba, K. Hagino, K. Hamaguchi, I. Harrus, I. Hatsukade, K. Hayashi, T. Hayashi, K. Hayashida, J. Hiraga, A. E. Hornschemeier, A. Hoshino, J. P. Hughes, Y. Ichinohe, R. Iizuka, H. Inoue, S. Inoue, Y. Inoue, K. Ishibashi, M. Ishida, K. Ishikawa, Y. Ishisaki, M. Itoh, M. Iwai, N. Iyomoto, J. S. Kaastra, T. Kallman, T. Kamae, E. Kara, J. Kataoka, S. Katsuda, J. Katsuta, M. Kawaharada, N. Kawai, R. L. Kelley, D. Khangulyan, C. A. Kilbourne, A. L. King, T. Kitaguchi, S. Kitamoto, T. Kitayama, T. Kohmura, M. Kokubun, S. Koyama, K. Koyama, P. Kretschmar, H. A. Krimm, A. Kubota, H. Kunieda, P. Laurent, F. Lebrun, S. -H. Lee, M. A. Leutenegger, O. Limousin, M. Loewenstein, K. S. Long, D. H. Lumb, G. M. Madejski, Y. Maeda, D. Maier, K. Makishima, M. Markevitch, H. Matsumoto, K. Matsushita, D. McCammon, B. R. McNamara, M. Mehdipour, E. D. Miller, J. M. Miller, S. Mineshige, K. Mitsuda, I. Mitsuishi, T. Miyazawa, T. Mizuno, H. Mori, K. Mori, H. Moseley, K. Mukai, H. Murakami, T. Murakami, R. F. Mushotzky, T. Nakagawa, H. Nakajima, T. Nakamori, T. Nakano, S. Nakashima, K. Nakazawa, K. Nobukawa, M. Nobukawa, H. Noda, M. Nomachi, S. L. O'Dell, H. Odaka, T. Ohashi, M. Ohno, T. Okajima, N. Ota, M. Ozaki, F. Paerels, S. Paltani, A. Parmar, R. Petre, C. Pinto, M. Pohl, F. S. Porter, K. Pottschmidt, B. D. Ramsey, C. S. Reynolds, H. R. Russell, S. Safi-Harb, S. Saito, K. Sakai, H. Sameshima, T. Sasaki, G. Sato, K. Sato, R. Sato, M. Sawada, N. Schartel, P. J. Serlemitsos, H. Seta, M. Shidatsu, A. Simionescu, R. K. Smith, Y. Soong, L. Stawarz, Y. Sugawara, S. Sugita, A. E. Szymkowiak, H. Tajima, H. Takahashi, T. Takahashi, S. Takeda, Y. Takei, T. Tamagawa, K. Tamura, T. Tamura, T. Tanaka, Yasuo Tanaka, Yasuyuki Tanaka, M. Tashiro, Y. Tawara, Y. Terada, Y. Terashima, F. Tombesi, H. Tomida, Y. Tsuboi, M. Tsujimoto, H. Tsunemi, T. Tsuru, H. Uchida, H. Uchiyama, Y. Uchiyama, S. Ueda, Y. Ueda, S. Ueno, S. Uno, C. M. Urry, E. Ursino, C. P. de Vries, S. Watanabe, N. Werner, D. R. Wik, D. R. Wilkins, B. J. Williams, S. Yamada, H. Yamaguchi, K. Yamaoka, N. Y. Yamasaki, M. Yamauchi, S. Yamauchi, T. Yaqoob, Y. Yatsu, D. Yonetoku, A. Yoshida, I. Zhuravleva, A. Zoghbi

    ASTROPHYSICAL JOURNAL LETTERS   837 ( 1 ) 668 - 672  2017年03月  [査読有り]

    　概要を見る

    X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E approximate to 3.5 keV emission line reported in several low-resolution studies of various massive systems, such as galaxies and clusters, including the Perseus cluster. We have analyzed the Hitomi first-light observation of the Perseus cluster. The emission line expected for Perseus based on the XMM-Newton signal from the large cluster sample under the dark matter decay scenario is too faint to be detectable in the Hitomi data. However, the previously reported 3.5 keV flux from Perseus was anomalously high compared to the sample-based prediction. We find no unidentified line at the reported high flux level. Taking into account the XMM measurement uncertainties for this region, the inconsistency with Hitomi is at a 99% significance for a broad dark matter line and at 99.7% for a narrow line from the gas. We do not find anomalously high fluxes of the nearby faint K line or the Ar satellite line that were proposed as explanations for the earlier 3.5 keV detections. We do find a hint of a broad excess near the energies of high-n transitions of S XVI (E similar or equal to 3.44 keV rest-frame)-a possible signature of charge exchange in the molecular nebula and another proposed explanation for the unidentified line. While its energy is consistent with XMM pn detections, it is unlikely to explain the MOS signal. A confirmation of this interesting feature has to wait for a more sensitive observation with a future calorimeter experiment.

    DOI

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  • 福島県の里山に大気沈着した放射性Csの長期変動

    金野俊太郎, 大河内博, 勝見尚也, 緒方裕子, 片岡淳, 岸本彩, 岩本康弘, 反町篤行, 床次眞司

    分析化学会誌   66 ( 3 ) 17  2017年03月  [査読有り]

  • Long-term Variations in the Distribution of Radioactive Cs in Plant, Soil, Stream Bottom Sand in a Small Forest in Fukushima Prefecture

    Kinno Shuntaro, Okochi Hiroshi, Katsumi Naoya, Ogata Hiroko, Kataoka Jun, Kishimoto Aya, Iwamoto Yasuhiro, Sorimachi Atsuyuki, Tokonami Shinji

    BUNSEKI KAGAKU   66 ( 3 ) 163 - 174  2017年03月  [査読有り]

    DOI

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    2
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  • Development of TOF-PET using Compton scattering by plastic scintillators

    M. Kuramoto, T. Nakamori, S. Kimura, S. Gunji, M. Takakura, J. Kataoka

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   845   668 - 672  2017年02月  [査読有り]

    　概要を見る

    We propose a time-of-flight (TOF) technique using plastic scintillators which have fast decay time of a few ns for positron emission tomography (PET). While the photoelectric absorption probability of the plastic for 511 keV gamma rays are extremely low due to its small density and effective atomic number, the cross section of Compton scattering is comparable to that of absorption by conventional inorganic scintillators. We thus propose TOF-PET using Compton scattering with plastic scintillators (Compton PET), and performed fundamental experiments towards exploration of the Compton-PET capability. We demonstrated that the plastic scintillators achieved the better time resolution in comparison to LYSO(Ce) and GAGG(Ce) scintillators. In addition we evaluated the depth-of-interaction resolving capability with the plastic scintillators. (C) 2016 Elsevier B.V. All rights reserved.

    DOI

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    13
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  • 分子イメージングに向けた高解像度コンプトンカメラの開発

    岸本 彩, 片岡 淳, 小出 絢子ほか

    Nuclear instruments & methods in physics research. Section A   845 ( 11 ) 656 - 659  2017年02月  [査読有り]

    DOI

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    30
    被引用数
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  • CTA報告123：全体報告

    窪 秀利, 手嶋 政廣, 戸谷 友則, 浅野 勝晃, 朝野 彰, 井岡 邦仁, 石尾 一馬, 稲田 知大, 井上 進, 井上 剛志, 井上 芳幸, 猪目 祐介, 岩村 由樹, 内山 泰伸, 大石 理子, 大岡 秀行, 大平 豊, 岡崎 奈緒, 奥村 曉, 折戸 玲子, 加賀谷 美佳, 格和 純, 片岡 淳, 片桐 秀明, 勝倉 大輔, 勝田 哲, 加藤 翔, 神本 匠, 川中 宣太, 木坂 将大, 木村 颯一朗, 櫛田 淳子, 久門 拓, 黒田 隼人, 郡司 修一, 郡 和範, 小山 志勇, 齋藤 隆之, 榊 直人, 櫻井 駿介, 佐々井 義矩, 佐野 栄俊, 澤田 真理, 柴田 徹, 砂田 裕志, 関崎 晴仁, 高田 順平, 高橋 慶太郎, 高橋 知也, 高橋 弘充, 高橋 光成, 田島 宏康, 立原 研悟, 田中 周太, 田中 孝明, 田中 真伸, 田中 康之, 種田 裕貴, 千川 道幸, 辻本 晋平, 鶴 剛, 寺田 幸功, 當真 賢二, 門叶 冬樹, 内藤 統也, 中嶋 大輔, 長瀧 重博, 中村 裕樹, 中森 健之, 中山 和則, 永吉 勤, 西嶋 恭司, 西山 楽, 野崎 誠也, 野田 浩司, 早川 貴敬, 林 克洋, 林田 将明, 原 敏, 馬場 彩, 日高 直哉, 平子 丈, 廣島 渚, 広谷 幸一, 深沢 泰司, 深見 哲志, 福井 康雄, 藤田 裕, 増田 周, 松本 浩典, 三浦 知佳, 水野 恒史, 村石 浩, 村瀬 孔大, 森 浩二, 柳田 昭平, 山崎 了, 山本 常夏, 山本 宏昭, 吉池 智史, 吉越 貴紀, 吉田 篤正, 吉田 龍生, 李 健, 李 兆衡

    日本物理学会講演概要集   72.2   355 - 355  2017年

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  • CTA報告125：CTA大口径望遠鏡初号機の焦点面検出器建設状況

    櫻井 駿介, 折戸 玲子, 片岡 淳, 片桐 秀明, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 池野 正弘, 澤田 真理, 砂田 裕志, 高橋 光成, 田中 真伸, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 中森 健之, 稲田 知大, 永吉 勤, 西嶋 恭司, 西山 楽, 野崎 誠也, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 猪目 祐介, 吉田 龍生, Hadasch D., Mazin D., 他CTA-Japan consortium, 岩村 由樹, 内田 智久, 大岡 秀行, 奥村 曉, 岡崎 奈緒

    日本物理学会講演概要集   72 ( 0 ) 360 - 360  2017年

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  • CTA 報告 126：CTA大口径望遠鏡焦点面検出器の改良と較正

    砂田 裕志, 折戸 玲子, 片岡 淳, 片桐 秀明, 木村 颯一朗, 櫛田 淳子, 窪 秀利, 郡司 修一, 小山 志勇, 今野 裕介, 齋藤 隆之, 池野 正弘, 澤田 真理, 櫻井 駿介, 高橋 光成, 田中 真伸, 辻本 晋平, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中嶋 大輔, 中森 健之, 稲田 知大, 永吉 勤, 西嶋 恭司, 西山 楽, 野崎 誠也, 林田 将明, 馬場 彩, 平子 丈, 深見 哲志, 増田 周, 山本 常夏, 猪目 祐介, 吉田 龍生, Hadasch D., Mazin D., 他CTA-Japan consortium, 岩村 由樹, 内田 智久, 大岡 秀行, 奥村 曉, 岡崎 奈緒

    日本物理学会講演概要集   72 ( 0 ) 361 - 361  2017年

    DOI CiNii

  • Secondary-electron-bremsstrahlung imaging for proton therapy

    Yamaguchi Mitsutaka, Nagao Yuto, Ando Koki, Yamamoto Seiichi, Toshito Toshiyuki, Kataoka Jun, Kawachi Naoki

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   833   199-207 - 207  2016年10月  [査読有り]

    DOI

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    38
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  • Development and verification of signal processing system of avalanche photo diode for the active shields onboard ASTRO-H

    M. Ohno, T. Kawano, I. Edahiro, H. Shirakawa, N. Ohashi, C. Okada, S. Habata, J. Katsuta, Y. Tanaka, H. Takahashi, T. Mizuno, Y. Fukazawa, H. Murakami, S. Kobayashi, K. Miyake, K. Ono, Y. Kato, Y. Furuta, Y. Murota, K. Okuda, Y. Wada, K. Nakazawa, T. Mimura, J. Kataoka, Y. Ichinohe, Y. Uchida, M. Katsuragawa, H. Yoneda, G. Sato, R. Sato, M. Kawaharada, A. Harayama, H. Odaka, K. Hayashi, M. Ohta, S. Watanabe, M. Kokubun, T. Takahashi, S. Takeda, M. Kinoshita, K. Yamaoka, H. Tajima, Y. Yatsu, H. Uchiyama, S. Saito, T. Yuasa, K. Makishima

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   831   410 - 414  2016年09月

    　概要を見る

    The hard X-ray Imager and Soft Gamma-ray Detector onboard ASTRO-H demonstrate high sensitivity to hard X-ray (5–80 keV) and soft gamma-rays (60–600 keV), respectively. To reduce the background, both instruments are actively shielded by large, thick Bismuth Germanate scintillators. We have developed the signal processing system of the avalanche photodiode in the BGO active shields and have demonstrated its effectiveness after assembly in the flight model of the HXI/SGD sensor and after integration into the satellite. The energy threshold achieved is about 150 keV and anti-coincidence efficiency for cosmic-ray events is almost 100%. Installed in the BGO active shield, the developed signal processing system successfully reduces the room background level of the main detector.

    DOI

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    6
    被引用数
    (Scopus)

  • CALET Upper Limits on X-Ray and Gamma-Ray Counterparts of GW151226”

    Adriani, O, Akaike, Y, Asano, K, Asaoka, Y, Bagliesi, M. G, Bigongiari, G, Binns, W. R, Bonechi, S, Bongi, M, Brogi, P, Buckley, J. H, Cannady, N, Castellini, G, Checchia, C, Cherry, M. L, Collazuol, G, Di Felice, V, Ebisawa, K, Fuke, H, Guzik, T. G, Hams, T, Hareyama, M, Hasebe, N, Hibino, K, Ichimura, M, Ioka, K, Ishizaki, W, Israel, M. H, Javaid, A, Kasahara, K, Kataoka, J, Kataoka, R, Katayose, Y, Kato, C, Kawanaka, N, Kawakubo, Y, Kitamura, H, Krawczynski, H. S, Krizmanic, J. F, Kuramata, S, Lomtadze, T, Maestro, P, Marrocchesi, P. S, Messineo, A. M, Mitchell, J. W, Miyake, S, Mizutani, K, Moiseev, A. A, Mori, K, Mori, M, Mori, N, Motz, H. M, Munakata, K, Murakami, H, Nakagawa, Y. E, Nakahira, S, Nishimura, J, Okuno, S, Ormes, J. F, Ozawa, S, Pacini, L, Palma, F, Papini, P, Penacchioni, A. V, Rauch, B. F, Ricciarini, S, Sakai, K, Sakamoto, T, Sasaki, M, Shimizu, Y, Shiomi, A, Sparvoli, R, Spillantini, P, Stolzi, F, Takahashi, I, Takayanagi, M, Takita, M, Tamura, T, Tateyama, N, Terasawa, T, Tomida, H, Torii, S, Tsunesada, Y, Uchihori, Y, Ueno, S, Vannuccini, E, Wefel, J. P, Yamaoka, K, Yanagita, S, Yoshida, A, Yoshida, K, Yuda, T

      829 ( 1 )  2016年09月

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    34
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  • The Si/CdTe semiconductor camera of the ASTRO-H Hard X-ray Imager (HXI)

    Goro Sato, Kouichi Hagino, Shin Watanabe, Kei Genba, Atsushi Harayama, Hironori Kanematsu, Jun Kataoka, Miho Katsuragawa, Madoka Kawaharada, Shogo Kobayashi, Motohide Kokubun, Yoshikatsu Kuroda, Kazuo Makishima, Kazunori Masukawa, Taketo Mimura, Katsuma Miyake, Hiroaki Murakami, Toshio Nakano, Kazuhiro Nakazawa, Hirofumi Noda, Hirokazu Odaka, Mitsunobu Onishi, Shinya Saito, Rie Sato, Tamotsu Sato, Hiroyasu Tajima, Hiromitsu Takahashi, Tadayuki Takahashi, Shin'ichiro Takeda, Takayuki Yuasa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   831   235 - 241  2016年09月  [査読有り]

    　概要を見る

    The Hard X-ray Imager (HXI) is one of the instruments onboard the ASTRO-H mission [14 to be launched in early 2016. The HXI is the focal plane detector of the hard X-ray reflecting telescope that covers an energy range from 5 to 80 keV. It will execute observations of astronomical objects with a sensitivity for point sources as faint as 1/100,000 of the Crab nebula at &gt; 10 keV. The HXI camera - the imaging part of the HXI - is realized by a hybrid semiconductor detector system that consists of silicon (Si) and cadmium telluride (CdTe) semiconductor detectors. Here, we present the final design of the HXI camera and report on the development of the flight model. The camera is composed of four layers of Double-sided Silicon Strip Detectors (DSSDs) and one layer of CdTe Double -sided Strip Detector (CdTeDSD), each with an imaging area of 32 mm x 32 mm. The strip pitch of the Si and CdTe sensors is 250 pm, and the signals from all 1280 strips are processed by 40 Application Specified Integrated Circuits (ASICs) developed for the HXI. The five layers of sensors are vertically stacked with a 4 mm spacing to increase the detection efficiency. The thickness of the sensors is 0.5 mm for the Si, and 0.75 mm for the CdTe. In this configuration, soft X-ray photons will be absorbed in the Si part, while hard X-ray photons will go through the Si part and will be detected in the CdTe part. The design of the sensor trays, peripheral circuits, power connections, and readout schemes are also described. The flight models of the HXI camera have been manufactured, tested and installed in the HXI instrument and then on the satellite. (C) 2016 Elsevier B.V. All rights reserved.

    DOI

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  • Performance evaluation of newly developed SrI2(Eu) scintillator

    M. Takabe, A. Kishimoto, J. Kataoka, S. Sakuragi, Y. Yamasaki

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   831 ( 21 ) 260 - 264  2016年09月  [査読有り]

    　概要を見る

    The development of europium-doped strontium iodide (SrI2(Eu)) has attracted considerable attention, because of its excellent material properties as regards gamma -ray scintillator applications. These include its excellent energy resolution, high light output (&gt;80, 000 ph/MeV), and high effective atomic number (Z=49). Here we report on the performance of 0 1 in x 1 in SrI2(Eu) cylindrical crystals newly fabricated by Union Materials Inc. In this study, we measured the energy resolution and light output at 10 C temperature intervals between 40 and 40 degrees C, using an optically coupled 2 -in photomultiplier tube (PMT) (Super Bialkali, Hamamatsu). The SrI2(Eu) light output increased by 0.12%/degrees C as the temperature decreased. At 40 C, we obtained the optimal energy resolution recording 2.91 0.02% full width at half maximum (FWHM) for 662 keV gamma rays measured with 137Cs. For comparison, we also measured the same crystal using both a large-area (19 x 19 mm2) avalanche photodiode detector (APD) and 8 x 8 multi -pixel photon counter (MPPC) arrays of 3 x 3 mm2 pixels. The energy resolutions of 2.94 + 0.02%, 3.14 + 0.06% and 3.99 + 0.01% were obtained using PMT, APD, and MPPC, respectively, as measured at 20 degrees C. We also measured the inherent background of SrI2(Eu) in a cave composed of Cu Pb blocks with their thickness of 5-10 cm confirming that Srl2(Eu) has an extremely low inherent background radiation. In this study, we have shown that SrI2(Eu) is a promising scintillator that can be utilized for radiation measurements incorporating low-energy X-rays to high-energy gamma rays, and can thus be applied in various medical, industrial, and environmental treatment fields in the near future. (C) 2016 Elsevier B.V. All rights reserved.

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  • 物質中での放射性各種3次元分布を見積もる新規手法の提案

    岩本 康弘, 片岡 淳, 岸本 彩ほか

    Nuclear Instruments and Methods in Physics Research Section A   831 ( 21 ) 295 - 300  2016年09月  [査読有り]

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  • 携帯型コンプトンカメラを用いたリアルタイム即発ガンマ線イメージングの初期実証

    多屋 隆紀, 片岡 淳, 岸本 彩ほか

    Nuclear Instruments and Methods in Physics Research Section A   831 ( 21 ) 355 - 361  2016年09月  [査読有り]

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    27
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  • 放射性物質を可視化するコンプトンカメラ

    片岡淳, 武田伸一郎, 高橋忠幸

    光学 （日本光学会・学会誌）   出版中 ( 8 ) 289 - 299  2016年08月  [査読有り]  [招待有り]

    CiNii

  • NuSTAR衛星によるTeVブレーザーMrk421からの逆コンプトン散乱放射の発見

    片岡 淳

    The Astrophysical Journal   827 ( 1 ) 55  2016年08月  [査読有り]

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  • The quiescent intracluster medium in the core of the Perseus cluster

    Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steven W. Allen, Naohisa Anabuki, Lorella Angelini, Keith Arnaud, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Aya Bamba, Marshall Bautz, Roger Blandford, Laura Brenneman, Gregory V. Brown, Esra Bulbul, Edward Cackett, Maria Chernyakova, Meng Chiao, Paolo Coppi, Elisa Costantini, Jelle De Plaa, Jan Willem Den Herder, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C. Fabian, Carlo Ferrigno, Adam Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi Gallo, Poshak Gandhi, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Ilana Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko Hiraga, Ann Hornschemeier, Akio Hoshino, John Hughes, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, Kazunori Ishibashi, Manabu Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masayuki Itoh, Naoko Iyomoto, Jelle Kaastra, Timothy Kallman, Tuneyoshi Kamae, Erin Kara, Jun Kataoka, Satoru Katsuda, Junichiro Katsuta, Madoka Kawaharada, Nobuyuki Kawai, Richard Kelley, Dmitry Khangulyan, Caroline Kilbourne, Ashley King, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Shu Koyama, Katsuji Koyama, Peter Kretschmar, Hans Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, François Lebrun, Shiu Hang Lee, Maurice Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David Lumb, Grzegorz Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch

    Nature   535 ( 7610 ) 117 - 121  2016年07月

    　概要を見る

    Clusters of galaxies are the most massive gravitationally bound objects in the Universe and are still forming. They are thus important probes of cosmological parameters and many astrophysical processes. However, knowledge of the dynamics of the pervasive hot gas, the mass of which is much larger than the combined mass of all the stars in the cluster, is lacking. Such knowledge would enable insights into the injection of mechanical energy by the central supermassive black hole and the use of hydrostatic equilibrium for determining cluster masses. X-rays from the core of the Perseus cluster are emitted by the 50-million-kelvin diffuse hot plasma filling its gravitational potential well. The active galactic nucleus of the central galaxy NGC 1275 is pumping jetted energy into the surrounding intracluster medium, creating buoyant bubbles filled with relativistic plasma. These bubbles probably induce motions in the intracluster medium and heat the inner gas, preventing runaway radiative cooling - a process known as active galactic nucleus feedback. Here we report X-ray observations of the core of the Perseus cluster, which reveal a remarkably quiescent atmosphere in which the gas has a line-of-sight velocity dispersion of 164 ± 10 kilometres per second in the region 30-60 kiloparsecs from the central nucleus. A gradient in the line-of-sight velocity of 150 ± 70 kilometres per second is found across the 60-kiloparsec image of the cluster core. Turbulent pressure support in the gas is four per cent of the thermodynamic pressure, with large-scale shear at most doubling this estimate. We infer that a total cluster mass determined from hydrostatic equilibrium in a central region would require little correction for turbulent pressure.

    DOI

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  • Development of a high resolution gamma camera system using finely grooved GAGG scintillator

    Seiichi Yamamoto, Jun Kataoka, Tsubasa Oshima, Yoshimune Ogata, Tadashi Watabe, Hayato Ikeda, Yasukazu Kanai, Jun Hatazawa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   821   28 - 33  2016年06月  [査読有り]

    　概要を見る

    High resolution gamma cameras require small pixel scintillator blocks with high light output. However, manufacturing a small pixel scintillator block is difficult when the pixel size becomes small. To solve this limitation, we developed a high resolution gamma camera system using a finely grooved Ce-doped Gd3Al2Ga3O12 (GAGG) plate. Our gamma camera's detector consists of a 1-mm-thick finely grooved GAGG plate that is optically coupled to a 1-in. position sensitive photomultiplier tube (PSPMT). The grooved GAGG plate has 0.2 x 0.2 mm pixels with 0.05-mm wide slits (between the pixels) that were manufactured using a dicing saw. We used a Hamamatsu PSPMT with a 1-in. square high quantum efficiency (HQE) PSPMT (R8900-100-C12). The energy resolution for the Co-57 gamma photons (122 keV) was 18.5% FWHM. The intrinsic spatial resolution was estimated to be 0.7-mm FVVHM. With a 0.5-mm diameter pinhole collimator mounted to its front, we achieved a high resolution, small field-of-view gamma camera. The system spatial resolution for the Co-57 gamma photons was 1.0-mm FWHM, and the sensitivity was 0.0025%, 10 mm from the collimator surface. The Tc-99m HMDP administered mouse images showed the fine structures of the mouse body's parts. Our developed high resolution small pixel GAGG gamma camera is promising for such small animal imaging. (C) 2016 Elsevier B.V. All rights reserved.

    DOI

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    24
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  • X線シャドウを用いた 分子雲CO-H2比の変換係数測定

    祖父江 義明, 片岡 淳

    Publications of the Astronomical Society of Japan   68 ( 3 ) L8  2016年06月  [査読有り]

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    7
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  • 銀河中心の爆発モデルのNPS構造理解への応用

    祖父江 義明, 羽部 朝男, 片岡 淳

    Monthly notices of the Royal Astronomical Society   459 ( 1 ) 108 - 120  2016年06月  [査読有り]

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    24
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  • THE FIRST FERMI LAT SUPERNOVA REMNANT CATALOG

    F. Acero, M. Ackermann, M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, R. Bonino, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, R. Caputo, M. Caragiulo, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, A. Chekhtman, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. M. Cohen, J. Cohen-Tanugi, L. R. Cominsky, B. Condon, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, R. Desiante, S. W. Digel, L. Di Venere, P. S. Drell, A. Drlica-Wagner, C. Favuzzi, E. C. Ferrara, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, G. A. Gomez-Vargas, I. A. Grenier, M. H. Grondin, L. Guillemot, S. Guiriec, M. Gustafsson, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, J. W. Hewitt, A. B. Hill, D. Horan, X. Hou, G. Iafrate, T. Jogler, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Katsuta, M. Kerr, J. Knödlseder, D. Kocevski, M. Kuss, H. Laffon, J. Lande, S. Larsson, L. Latronico, M. Lemoine-Goumard, J. Li, L. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, J. Magill, S. Maldera, M. Marelli, M. Mayer

    Astrophysical Journal, Supplement Series   224 ( 1 )  2016年05月

    　概要を見る

    To uniformly determine the properties of supernova remnants (SNRs) at high energies, we have developed the first systematic survey at energies from 1 to 100 GeV using data from the Fermi Large Area Telescope (LAT). Based on the spatial overlap of sources detected at GeV energies with SNRs known from radio surveys, we classify 30 sources as likely GeV SNRs. We also report 14 marginal associations and 245 flux upper limits. A mock catalog in which the positions of known remnants are scrambled in Galactic longitude allows us to determine an upper limit of 22% on the number of GeV candidates falsely identified as SNRs. We have also developed a method to estimate spectral and spatial systematic errors arising from the diffuse interstellar emission model, a key component of all Galactic Fermi LAT analyses. By studying remnants uniformly in aggregate, we measure the GeV properties common to these objects and provide a crucial context for the detailed modeling of individual SNRs. Combining our GeV results with multiwavelength (MW) data, including radio, X-ray, and TeV, we demonstrate the need for improvements to previously sufficient, simple models describing the GeV and radio emission from these objects. We model the GeV and MW emission from SNRs in aggregate to constrain their maximal contribution to observed Galactic cosmic rays.

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    216
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  • Observation of polarized hard X-ray emission from the Crab by the PoGOLite Pathfinder

    Chauvin M, Floren H. -G, Jackson M, Kamae T, Kawano T, Kiss M, Kole M, Mikhalev V, Moretti E, Olofsson G, Rydstrom S, Takahashi H, Iyudin A, Arimoto M, Fukazawa Y, Kataoka J, Kawai N, Mizuno T, Ryde F, Tajima H, Takahashi T, Pearce M

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   456 ( 1 ) L84 - L88  2016年02月  [査読有り]

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    19
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  • 19pCA-10 プラスチックシンチレータを用いたコンプトン散乱型TOF-PET装置の基礎開発

    倉本 南, 中森 健之, 木村 沙也香, 郡司 修一, 高倉 美華, 小野寺 拓也, 片岡 淳

    日本物理学会講演概要集   71   101 - 101  2016年

    DOI CiNii

  • X線衛星「ひとみ(ASTRO-H)」搭載の硬X線撮像検出器(HXI)の軌道上動作

    中澤 知洋, 高橋 忠幸, 国分 紀秀, 渡辺 伸, 佐藤 悟朗, 太田 方之, 萩野 浩一, 佐藤 理江, Lee Herman, 能町 正治, 米徳 大輔, 田中 孝明, 榎戸 輝揚, 寺田 幸功, 内山 秀樹, 谷津 洋一, 一戸 悠人, 野田 博文, 田島 宏康, 山岡 和貴, 林 克洋, 深沢 泰司, 水野 恒史, 大野 雅功, 高橋 弘充, 中森 健之, 内山 泰伸, 斉藤 新也, 牧島 一夫, 湯浅 孝行, 中野 俊男, 片岡 淳, Francois Lebrun, Andrea Goldwurm, Olivier Limousin, Philippe Laurent, Daniel Maier, 武田 伸一郎, 小高 裕和, その他HXIチーム

    日本物理学会講演概要集   71   370 - 370  2016年

    　概要を見る

    <p>本年2月17日に打ち上げられ3月26日に通信途絶したX線天文衛星「ひとみ」には、5-80 keVを2分角で撮像分光する硬X線撮像検出器(HXI)が搭載されていた。打ち上げ後、伸展式光学ベンチの展開を経て、3月8日よりHXI検出器の立ち上げを始めた。3月14日は2台のHXIが立ち上がり、観測を開始した。軌道上での性能は、エネルギー分解能を含め地上試験と一致し、無事に立ち上げに成功した。天体の撮像とスペクトルも取得できている。軌道上のバックグラウンドも40 keV以下ではほぼ期待通りの性能を発揮した。この結果について報告する。</p>

    DOI CiNii

  • X線衛星「ひとみ(ASTRO-H)」搭載軟ガンマ線検出器(SGD)の軌道上動作

    渡辺 伸, 田島 宏康, 深沢 泰司, 一戸 悠人, 内山 秀樹, 内山 泰伸, 榎戸 輝揚, 太田 方之, 大野 雅功, 小高 裕和, 片岡 淳, 勝田 隼一郎, 北口 貴雄, 国分 紀秀, Goldwurm Andrea, 斉藤 新也, 佐藤 悟朗, 佐藤 理江, 高橋 忠幸, 高橋 弘充, 武田 伸一郎, 田中 孝明, 田中 康之, 寺田 幸功, 中澤 知洋, 中野 俊男, 中森 健之, 野田 博文, 萩野 浩一, 林 克洋, Blandford Roger, 牧島 一夫, Madejski Grzegorz, 水野 恒史, 森 國城, 谷津 陽一, 山岡 和貴, 湯浅 孝行, 米徳 大輔, Laurent Philippe, Limousin Olivier, Lebrun François, ほかSGDチーム

    日本物理学会講演概要集   71   371 - 371  2016年

    　概要を見る

    <p>2016年2月17日に打ち上げられたX線衛星「ひとみ」(ASTRO-H)に搭載された軟ガンマ線検出器(Soft Gamma-ray Detector:SGD)の軌道動作実績について報告する。SGDは、3月15日より順次、センサーの立ち上げを行い、通信途絶となった3月26日まで、機能的には正常に動作させることができた。一部の天体からのガンマ線信号の取得に成功し、高感度ガンマ線観測を行う上で重要となる軌道上バックグランドのデータを得た。SGDで初めて実現したSi/CdTe半導体コンプトンカメラで得られたこれらのデータについて、報告を行う。</p>

    DOI CiNii

  • The ASTRO-H (Hitomi) X-ray astronomy satellite

    Tadayuki Takahashi, Motohide Kokubun, Kazuhisa Mitsuda, Richard Kelley, Takaya Ohashi, Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Steve Allen, Naohisa Anabuki, Lorella Angelini, Keith Arnaud, Makoto Asai, Marc Audard, Hisamitsu Awaki, Magnus Axelsson, Philipp Azzarello, Chris Baluta, Aya Bamba, Nobutaka Bando, Marshall Bautz, Thomas Bialas, Roger Blandford, Kevin Boyce, Laura Brenneman, Greg Brown, Esra Bulbul, Edward Cackett, Edgar Canavan, Maria Chernyakova, Meng Chiao, Paolo Coppi, Elisa Costantini, Jelle De Plaa, Jan Willem Den Herder, Michael DiPirro, Chris Done, Tadayasu Dotani, John Doty, Ken Ebisawa, Megan Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew Fabian, Carlo Ferrigno, Adam Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi Gallo, Poshak Gandhi, Kirk Gilmore, Margherita Giustini, Andrea Goldwurm, Liyi Gu, Matteo Guainazzi, Daniel Haas, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, Atsushi Harayama, Ilana Harrus, Isamu Hatsukade, Takayuki Hayashi, Katsuhiro Hayashi, Kiyoshi Hayashida, Junko Hiraga, Kazuyuki Hirose, Ann Hornschemeier, Akio Hoshino, John Hughes, Yuto Ichinohe, Ryo Iizuka, Yoshiyuki Inoue, Hajime Inoue, Kazunori Ishibashi, Manabu Ishida, Kumi Ishikawa, Kosei Ishimura, Yoshitaka Ishisaki, Masayuki Itoh, Naoko Iwata, Naoko Iyomoto, Chris Jewell, Jelle Kaastra, Timothy Kallman, Tuneyoshi Kamae, Erin Kara, Jun Kataoka, Satoru Katsuda, Junichiro Katsuta, Madoka Kawaharada, Nobuyuki Kawai, Taro Kawano, Shigeo Kawasaki, Dmitry Khangulyan, Caroline Kilbourne, Mark Kimball, Ashley King

    Proceedings of SPIE - The International Society for Optical Engineering   9905  2016年

    　概要を見る

    The Hitomi (ASTRO-H) mission is the sixth Japanese X-ray astronomy satellite developed by a large international collaboration, including Japan, USA, Canada, and Europe. The mission aimed to provide the highest energy resolution ever achieved at E > 2 keV, using a microcalorimeter instrument, and to cover a wide energy range spanning four decades in energy from soft X-rays to gamma-rays. After a successful launch on 2016 February 17, the spacecraft lost its function on 2016 March 26, but the commissioning phase for about a month provided valuable information on the on-board instruments and the spacecraft system, including astrophysical results obtained from first light observations. The paper describes the Hitomi (ASTRO-H) mission, its capabilities, the initial operation, and the instruments/spacecraft performances confirmed during the commissioning operations for about a month.

    DOI

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  • The hard X-ray imager (HXI) onboard ASTRO-H

    Kazuhiro Nakazawa, Goro Sato, Motohide Kokubun, Teruaki Enoto, Yasushi Fukazawa, Kouichi Hagino, Atsushi Harayama, Katsuhiro Hayashi, Jun Kataoka, Junichiro Katsuta, Philippe Laurent, Francois Lebrung, Olivier Limousin, Kazuo Makishima, Tsunefumi Mizuno, Kunishiro Mori, Takeshi Nakamori, Toshio Nakano, Hirofumi Noda, Hirokazu Odaka, Masanori Ohno, Masayuki Ohta, Shinya Saito, Rie Sato, Hiroyasu Tajima, Hiromitsu Takahashi, Tadayuki Takahashi, Shin'ichiro Takeda, Yukikatsu Terada, Hideki Uchiyama, Yasunobu Uchiyama, Shin Watanabe, Kazutaka Yamaoka, Yoichi Yatsu, Takayuki Yuasa

    SPACE TELESCOPES AND INSTRUMENTATION 2016: ULTRAVIOLET TO GAMMA RAY   9905  2016年  [査読有り]

    　概要を見る

    Hitomi X-ray observatory launched in 17 February 2016 had a hard X-ray imaging spectroscopy system made of two hard X-ray imagers (HXIs) coupled with two hard X-ray telescopes (HXTs). With 12 m focal length, they provide fine (2' half-power diameter; HPD) imaging spectroscopy at 5 to 80 keV. The HXI main imagers are made of 4 layers of Si and a CdTe semiconductor double-sided strip detectors, stacked to enhance detection efficiency as well as to enable photon interaction-depth sensing. Active shield made of 9 BGO scintillators surrounds the imager to provide with low background. Following the deployment of the Extensible Optical Bench (EOB) on 28 February, the HXI was gradually turned on. Two imagers successfully started observation on 14 March, and was operational till the incident lead to Hitomo loss, on 26 March. All detector channels, 1280 ch of imager and 11 channel of active shields and others each, worked well and showed performance consistent with those seen on ground. From the first light observation of G21.5-0.9 and the following Crab observations, 5 80 keV energy coverage and good detection efficiency were confirmed. With blank sky observations, we checked our background level. In some geomagnetic region, strong background continuum, presumably caused by trapped electron with energy similar to 100 keV, is seen. But by cutting the high-background time-intervals, the background became significantly lower, typically with 1-3x10(-4) counts s(-1) keV(-1) cm(-2) (here cm(2) is shown with detector geometrical area). Above 30 keV, line and continuum emission originating from activation of CdTe was significantly seen, though the level of 1-4x10(-4) counts s(-1) keV(-1) cm(-2) is still comparable to those seen in NuSTAR. By comparing the effective area and background rate, preliminary analysis shows that the HXI had a statistical sensitivity similar to NuSTAR for point sources, and more than twice better for largely extended sources.

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    13
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  • 2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES

    Ackermann, M, Ajello, M, Atwood, W. B, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Gonzalez, J. Becerra, Bellazzini, R, Bissaldi, E, Blandford, R. D, Bloom, E. D, Bonino, R, Bottacini, E, Brandt, T. J, Bregeon, J, Bruel, P, Buehler, R, Buson, S, Caliandro, G. A, Cameron, R. A, Caputo, R, Caragiulo, M, Caraveo, P. A, Cavazzuti, E, Cecchi, C, Charles, E, Chekhtman, A, Cheung, C. C, Chiang, J, Chiaro, G, Ciprini, S, Cohen, J. M, Cohen-Tanugi, J, Cominsky, L. R, Conrad, J, Cuoco, A, Cutini, S, D'Ammando, F, de Angelis, A, de Palma, F, Desiante, R, Di Mauro, M, Di Venere, L, Dominguez, A, Drell, P. S, Favuzzi, C, Fegan, S. J, Ferrara, E. C, Focke, W. B, Fortin, P, Franckowiak, A, Fukazawa, Y, Funk, S, Furniss, A. K, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, I. A, Grondin, M. -H, Guillemot, L, Guiriec, S, Harding, A. K, Hays, E, Hewitt, J. W, Hill, A. B, Horan, D, Iafrate, G, Hartmann, Dieter, Jogler, T, Johannesson, G, Johnson, A. S, Kamae, T, Kataoka, J, Knoedlseder, J, Kuss, M, La Mura, G, Larsson, S, Latronico, L, Lemoine-Goumard, M, Li, J, Li, L, Longo, F, Loparco, F, Lott, B, Lovellette, M. N, Lubrano, P, Madejski, G. M, Maldera, S, Manfreda, A, Mayer, M, Mazziotta, M. N, Michelson, P. F, Mirabal, N, Mitthumsiri, W, Mizuno, T, Moiseev, A. A, Monzani, M. E, Morselli, A, Moskalenko, I. V, Murgia, S, Nuss, E, Ohsugi, T, Omodei, N, Orienti, M, Orlando, E, Ormes, J. F, Paneque, D, Perkins, J. S, Pesce-Rollins, M, Petrosian, V, Piron, F, Pivato, G, Porter, T. A, Raino, S, Rando, R, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Reposeur, T, Romani, R. W, Sanchez-Conde, M, Parkinson, P. M. Saz, Schmid, J, Schulz, A, Sgro, C, Siskind, E. J, Spada, F, Spandre, G, Spinelli, P, Suson, D. J, Tajima, H, Takahashi, H, Takahashi, M, Takahashi, T, Thayer, J. B, Thompson, D. J, Tibaldo, L, Torres, D. F, Tosti, G, Troja, E, Vianello, G, Wood, K. S, Wood, M, Yassine, M, Zaharijas, G, Zimmer, S

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   222 ( 1 )  2016年01月  [査読有り]

    　概要を見る

    We present a catalog of sources detected above 50 GeV by the Fermi-Large Area Telescope (LAT) in 80 months of data. The newly delivered Pass. 8 event-level analysis allows the detection and characterization of sources in the 50 GeV-2 TeV energy range. In this energy band, Fermi-LAT. has detected 360 sources, which constitute the second catalog of hard Fermi-LAT. sources (2FHL). The improved angular resolution enables the precise localization of point sources (similar to 1.&#039; 7 radius at 68% C.L.) and the detection and characterization of spatially extended sources. We find that 86% of the sources can be associated with counterparts at other wavelengths, of which the majority (75%) are active galactic nuclei and the rest (11%) are Galactic sources. Only 25% of the 2FHL sources have been previously detected by Cherenkov telescopes, implying that the 2FHL provides a reservoir of candidates to be followed up at very high energies. This work closes the energy gap between the observations performed at GeV energies by Fermi-LAT. on orbit and the observations performed at higher energies by Cherenkov telescopes from the ground.

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  • The soft gamma-ray detector (SGD) onboard ASTRO-H

    Watanabe Shin, Tajima Hiroyasu, Fukazawa Yasushi, Blandford Roger, Enoto Teruaki, Goldwurm Andrea, Hagino Kouichi, Hayashi Katsuhiro, Ichinohe Yuto, Kataoka Jun, Katsuta Junichiro, Kitaguchi Takao, Kokubun Motohide, Laurent Philippe, Lebrun Francois, Limousin Olivier, Madejski Grzegorz M, Makishima Kazuo, Mizunoe Tsunefumi, Mori Kunishiro, Nakamori Takeshi, Nakano Toshio, Nakazawa Kazuhiro, Noda Hirofumi, Odaka Hirokazu, Ohno Masanori, Ohta Masayuki, Saito Shinya, Sato Goro, Sato Rie, Takeda Shin'ichiro, Takahashi Hiromitsu, Takahashi Tadayuki, Tanaka Takaaki, Tanaka Yasuyuki, Terada Yukikatsu, Uchiyama Hideki, Uchiyama Yasunobu, Yamaoka Kazutaka, Yatsu Yoichi, Yonetoku Daisuke, Yuasa Takayuki

    SPACE TELESCOPES AND INSTRUMENTATION 2016: ULTRAVIOLET TO GAMMA RAY   9905  2016年  [査読有り]

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  • Observation of polarized hard X-ray emission from the Crab by the PoGOLite Pathfinder

    M. Chauvin, H. G. Florén, M. Jackson, T. Kamae, T. Kawano, M. Kiss, M. Kole, V. Mikhalev, E. Moretti, G. Olofsson, S. Rydström, H. Takahashi, A. Iyudin, M. Arimoto, Y. Fukazawa, J. Kataoka, N. Kawai, T. Mizuno, F. Ryde, H. Tajima, T. Takahashi, M. Pearce

    Monthly Notices of the Royal Astronomical Society: Letters   456 ( 1 ) L84 - L88  2016年

    　概要を見る

    We have measured the linear polarization of hard X-ray emission from the Crab in a previously unexplored energy interval, 20-120 keV. The introduction of two new observational parameters, the polarization fraction and angle stands to disentangle geometrical and physical effects, thereby providing information on the pulsar wind geometry and magnetic field environment. Measurements are conducted using the PoGOLite Pathfinder - a balloon-borne polarimeter. Polarization is determined by measuring the azimuthal Compton scattering angle of incident X-rays in an array of plastic scintillators housed in an anticoincidence well. The polarimetric response has been characterized prior to flight using both polarized and unpolarized calibration sources. We address possible systematic effects through observations of a background field. The measured polarization fraction for the integrated Crab light curve is 18.4+9.8 -10.6 per cent, corresponding to an upper limit (99 per cent credibility) of 42.4 per cent, for a polarization angle of (149.2 ± 16.0)°.

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  • Development of a high-precision color gamma-ray image sensor based on TSV-MPPC and diced scintillator arrays

    T. Oshima, J. Kataoka, A. Kishimoto, T. Fujita, Y. Kurei, T. Nishiyama, H. Morita, S. Yamamoto, K. Ogawa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   803   8 - 14  2015年12月  [査読有り]

    　概要を見る

    We developed a high precision color gamma ray image sensor with fine spatial resolution that is cost effective, widely applicable, and very sensitive, by using a diced Ce-doped Gd3Al2Ga3O12 (Ce:CACC.) scintillator array coupled with a 3.0 x 3.0 mm(2)/pixel 8 x 8 MPPC-array. The proposed image sensor can measure the energy of individual X-ray photons transmitted through an object. The pixel size of the Ce:GACC scintillator array is 02 mm, and the pixels are separated by 50-mu m-wide micro grooves, The image sensor has an area of 20 x 20 mm(2) and a thickness of 1.0 mm, and it achieves an excellent spatial resolution of 0.3-0.4 mm and energy resolutions of 12% and 18% (FVVHM) for 122 and 59.5 keV gamma rays, respectively. We conducted an experiment to determine the local effective atomic number of metals using dual energy gamma ray sources. In addition, we developed a color composite image using mixed images Laken at three energies (31, 59.5, and 88 keV). (C). 2015 Elsevier B.V. All rights reserved.

    DOI

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    14
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  • Demonstration of three-dimensional imaging based on handheld Compton camera

    A. Kishimoto, J. Kataoka, T. Nishiyama, T. Taya, S. Kabuki

    JOURNAL OF INSTRUMENTATION   10 ( 11 )  2015年11月  [査読有り]

    　概要を見る

    Compton cameras are potential detectors that are capable of performing measurements across a wide energy range for medical imaging applications, such as in nuclear medicine and ion beam therapy. In previous work, we developed a handheld Compton camera to identify environmental radiation hotspots. This camera consists of a 3D position-sensitive scintillator array and multi-pixel photon counter arrays. In this work, we reconstructed the 3D image of a source via list-mode maximum likelihood expectation maximization and demonstrated the imaging performance of the handheld Compton camera. Based on both the simulation and the experiments, we confirmed that multi-angle data acquisition of the imaging region significantly improved the spatial resolution of the reconstructed image in the direction vertical to the detector. The experimental spatial resolutions in the X, Y, and Z directions at the center of the imaging region were 6.81 mm +/- 0.13 mm, 6.52 mm +/- 0.07 mm and 6.71 mm +/- 0.11 mm (FWHM), respectively. Results of multi-angle data acquisition show the potential of reconstructing 3D source images.

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  • 携帯型コンプトンカメラを用いた3次元イメージングの実証

    岸本 彩, 片岡 淳, 西山 徹ほか

    Journal of Instrumentation   10 ( 11 ) P11001  2015年11月  [査読有り]

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    20
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  • FIRST NuSTAR OBSERVATIONS of MRK 501 WITHIN A RADIO to TeV MULTI-INSTRUMENT CAMPAIGN

    A. Furniss, K. Noda, S. Boggs, J. Chiang, F. Christensen, W. Craig, P. Giommi, C. Hailey, F. Harisson, G. Madejski, K. Nalewajko, M. Perri, D. Stern, M. Urry, F. Verrecchia, W. Zhang, M. L. Ahnen, S. Ansoldi, L. A. Antonelli, P. Antoranz, A. Babic, B. Banerjee, P. Bangale, U. Barres De Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, E. Bernardini, B. Biasuzzi, A. Biland, O. Blanch, S. Bonnefoy, G. Bonnoli, F. Borracci, T. Bretz, E. Carmona, A. Carosi, A. Chatterjee, R. Clavero, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Da Vela, F. Dazzi, A. De Angelis, G. De Caneva, B. De Lotto, E. De Oña Wilhelmi, C. Delgado Mendez, F. Di Pierro, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Eisenacher Glawion, D. Elsaesser, A. Fernández-Barral, D. Fidalgo, M. V. Fonseca, L. Font, K. Frantzen, C. Fruck, D. Galindo, R. J. García López, M. Garczarczyk, D. Garrido Terrats, M. Gaug, P. Giammaria, N. Godinović, A. González Muñoz, D. Guberman, Y. Hanabata, M. Hayashida, J. Herrera, J. Hose, D. Hrupec, G. Hughes, W. Idec, H. Kellermann, K. Kodani, Y. Konno, H. Kubo, J. Kushida, A. La Barbera, D. Lelas, N. Lewandowska, E. Lindfors, S. Lombardi, F. Longo, M. López, R. López-Coto, A. López-Oramas, E. Lorenz, P. Majumdar, M. Makariev, K. Mallot, G. Maneva, M. Manganaro

    Astrophysical Journal   812 ( 1 )  2015年10月

    　概要を見る

    We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope, Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASP-WEBT program, as well as radio observations by OVRO, Metsähovi, and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using event-by-event corrections derived with a Light Detection and Ranging (LIDAR) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution (SED) between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the four extended NuSTAR observations) show evidence of the onset of inverse-Compton emission at hard X-ray energies. We apply a single-zone equilibrium synchrotron self-Compton (SSC) model to five simultaneous broadband SEDs. We find that the SSC model can reproduce the observed broadband states through a decrease in the magnetic field strength coinciding with an increase in the luminosity and hardness of the relativistic leptons responsible for the high-energy emission.

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    57
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  • THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE

    M. Ackermann, M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, J. Becerra Gonzalez, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, R. Bonino, E. Bottacini, T. J. Brandt, J. Bregeon, R. J. Britto, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, B. Carpenter, J. M. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, S. Cutini, R. D'Abrusco, F. D'Ammando, A. De Angelis, R. Desiante, S. W. Digel, L. Di Venere, P. S. Drell, C. Favuzzi, S. J. Fegan, E. C. Ferrara, J. Finke, W. B. Focke, A. Franckowiak, L. Fuhrmann, Y. Fukazawa, A. K. Furniss, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, S. Guiriec, J. W. Hewitt, A. B. Hill, D. Horan, R. Itoh, G. Jóhannesson, A. S. Johnson, W. N. Johnson, J. Kataoka, T. Kawano, F. Krauss, M. Kuss, G. La Mura, S. Larsson, L. Latronico, C. Leto, J. Li, L. Li, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia

    Astrophysical Journal   810 ( 1 )  2015年09月

    　概要を見る

    The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected between 100 MeV and 300 GeV with a Test Statistic greater than 25, between 2008 August 4 and 2012 July 31. The 3LAC includes 1591 AGNs located at high Galactic latitudes (), a 71% increase over the second catalog based on 2 years of data. There are 28 duplicate associations, thus 1563 of the 2192 high-latitude gamma-ray sources of the 3FGL catalog are AGNs. Most of them (98%) are blazars. About half of the newly detected blazars are of unknown type, i.e., they lack spectroscopic information of sufficient quality to determine the strength of their emission lines. Based on their gamma-ray spectral properties, these sources are evenly split between flat-spectrum radio quasars (FSRQs) and BL Lacs. The most abundant detected BL Lacs are of the high-synchrotron-peaked (HSP) type. About 50% of the BL Lacs have no measured redshifts. A few new rare outliers (HSP-FSRQs and high-luminosity HSP BL Lacs) are reported. The general properties of the 3LAC sample confirm previous findings from earlier catalogs. The fraction of 3LAC blazars in the total population of blazars listed in BZCAT remains non-negligible even at the faint ends of the BZCAT-blazar radio, optical, and X-ray flux distributions, which hints that even the faintest known blazars could eventually shine in gamma-rays at LAT-detection levels. The energy-flux distributions of the different blazar populations are in good agreement with extrapolation from earlier catalogs.

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  • 25pSJ-5 ASTRO-H搭載硬X線撮像検出器エネルギー較正手法と実機検証

    三村 健人, 佐藤 悟朗, 小林 翔悟, 村上 浩章, 片岡 淳, 三宅 克馬, 大野 雅功, 古田 禄大, 室田 優紀, 小野 光, 加藤 佑一, 笹野 理, 櫻井 壮希, 中野 俊男, 中澤 知洋, 牧島 一夫, 萩野 浩一, 小高 裕和, 川原田 円, 佐藤 理江, 渡辺 伸, 国分 紀秀, 高橋 忠幸, 湯浅 孝行, 斉藤 新也, 勝田 準一郎, 高橋 弘充, 深沢 泰司, 山岡 和貴, 田島 宏康, 谷津 陽一, 内山 秀樹, HXIチーム

    日本物理学会講演概要集   70 ( 2 ) 353 - 353  2015年09月

    DOI CiNii

  • The CALorimetric Electron Telescope (CALET) for high-energy astroparticle physics on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, J. H. Buckley, G. Castellini, M. L. Cherry, G. Collazuol, K. Ebisawa, V. Di Felice, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, M. H. Israel, A. Javaid, E. Kamioka, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, N. Kawanaka, H. Kitamura, T. Kotani, H. S. Krawczynski, J. F. Krizmanic, A. Kubota, S. Kuramata, T. Lomtadze, P. Maestro, L. Marcelli, P. S. Marrocchesi, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, T. Sakamoto, M. Sasaki, M. Shibata, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Journal of Physics: Conference Series   632 ( 1 )  2015年08月

    　概要を見る

    The CALorimetric Electron Telescope (CALET) is a space experiment, currently under development by Japan in collaboration with Italy and the United States, which will measure the flux of cosmic-ray electrons (and positrons) up to 20 TeV energy, of gamma rays up to 10 TeV, of nuclei with Z from 1 to 40 up to 1 PeV energy, and will detect gamma-ray bursts in the 7 keV to 20 MeV energy range during a 5 year mission. These measurements are essential to investigate possible nearby astrophysical sources of high energy electrons, study the details of galactic particle propagation and search for dark matter signatures. The main detector of CALET, the Calorimeter, consists of a module to identify the particle charge, followed by a thin imaging calorimeter (3 radiation lengths) with tungsten plates interleaving scintillating fibre planes, and a thick energy measuring calorimeter (27 radiation lengths) composed of lead tungstate logs. The Calorimeter has the depth, imaging capabilities and energy resolution necessary for excellent separation between hadrons, electrons and gamma rays. The instrument is currently being prepared for launch (expected in 2015) to the International Space Station ISS, for installation on the Japanese Experiment Module - Exposure Facility (JEM-EF).

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    9
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  • Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz

    Shoko Koyama, Motoki Kino, Akihiro Doi, Kotaro Niinuma, Kazuhiro Hada, Hiroshi Nagai, Mareki Honma, Kazunori Akiyama, Marcello Giroletti, Gabriele Giovannini, Monica Orienti, Naoki Isobe, Jun Kataoka, David Paneque, Hideyuki Kobayashi, Keiichi Asada

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   67 ( 4 )  2015年08月  [査読有り]

    　概要を見る

    We investigate the position of the radio core in a blazar by multi-epoch astrometric observations at 43 GHz. Using the VLBI Exploration of Radio Astrometry (VERA), we have conducted four adjacent observations in 2011 February and another four in 2011 October, and succeeded in measuring the position of the radio core in the TeV blazar Mrk 501 relative to a distant compact quasar NRAO 512. During our observations, we find that (1) there is no positional change within similar to 0.2mas or similar to 2.0 pc de-projected with +/- 1 sigma s error for the weighted-mean phase-referenced positions of theMrk 501 core relative to NRAO 512 over four adjacent days, and (2) there is an indication of position change for the 3C 345 core relative to NRAO 512. By applying our results to the standard internal shock model for blazars, we constrain the bulk Lorenz factors of the ejecta.

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    3
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  • GLOBAL STRUCTURE OF ISOTHERMAL DIFFUSE X-RAY EMISSION ALONG THE FERMI BUBBLES

    J. Kataoka, M. Tahara, T. Totani, Y. Sofue, Y. Inoue, S. Nakashima, C. C. Cheung

    ASTROPHYSICAL JOURNAL   807 ( 1 )  2015年07月  [査読有り]

    　概要を見る

    In our previous works, we found absorbed thermal X-ray plasma with kT similar or equal to 0.3 keV observed ubiquitously near the edges of the Fermi bubbles and interpreted this emission as weakly shock-heated Galactic halo gas. Here we present a systematic and uniform analysis of archival Suzaku (29 pointings; 6 newly presented) and Swift (68 pointings; 49 newly presented) data within Galactic longitudes vertical bar l vertical bar &lt; 20 degrees and latitude 5 degrees less than or similar to vertical bar b vertical bar &lt; 60 degrees, covering the whole extent of the Fermi bubbles. We show that the plasma temperature is constant at kT similar or equal to 0.30 +/- 0.07 keV, while the emission measure (EM) varies by an order of magnitude, increasing toward the Galactic center (i.e., low vertical bar b vertical bar) with enhancements at the North Polar Spur (NPS), SE-claw, and NW-clump features. Moreover, the EM distribution of kT similar or equal to 0.30 keV plasma is highly asymmetric in the northern and southern bubbles. Although the association of the X-ray emission with the bubbles is not conclusive, we compare the observed EM properties with simple models assuming (i) a filled halo without bubbles, whose gas density follows a hydrostatic isothermal model (King profile), and (ii) a bubble-in-halo in which two identical bubbles expand into the halo, forming thick shells of swept halo gas. We argue that the EM profile in the north (b &gt; 0 degrees) favors (ii), whereas that of the south (b &lt; 0 degrees) is rather close to (i), but a weak excess signature is clearly detected also in the south like NPS (South Polar Spur). Such an asymmetry, if due to the bubbles, cannot be fully understood only by the inclination of bubbles' axis against the Galactic disk normal, thus suggesting asymmetric outflow due to different environmental/initial conditions.

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    36
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  • フェルミバブルに付随した、熱的拡散X線プラズマの大局的構造

    J.Kataoka

    The Astrophysical Journal   807 ( 1 ) 77 - 89  2015年07月  [査読有り]

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    36
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  • FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG

    F. Acero, M. Ackermann, M. Ajello, A. Albert, W. B. Atwood, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, A. Belfiore, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, J. R. Bogart, R. Bonino, E. Bottacini, J. Bregeon, R. J. Britto, P. Bruel, R. Buehler, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, R. Caputo, M. Caragiulo, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, E. Charles, R. C.G. Chaves, A. Chekhtman, C. C. Cheung, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, M. Deklotz, F. De Palma, R. Desiante, S. W. Digel, L. Di Venere, P. S. Drell, R. Dubois, D. Dumora, C. Favuzzi, S. J. Fegan, E. C. Ferrara, J. Finke, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, B. Giebels, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, D. Hadasch, A. K. Harding, E. Hays, J. W. Hewitt, A. B. Hill, D. Horan, G. Iafrate, T. Jogler, G. Jóhannesson, R. P. Johnson, A. S. Johnson, T. J. Johnson, W. N. Johnson, T. Kamae, J. Kataoka, J. Katsuta, M. Kuss, G. La Mura, D. Landriu, S. Larsson, L. Latronico, M. Lemoine-Goumard, J. Li, L. Li, F. Longo

    Astrophysical Journal, Supplement Series   218 ( 2 )  2015年06月

    　概要を見る

    We present the third Fermi Large Area Telescope (LAT) source catalog (3FGL) of sources in the 100 MeV-300 GeV range. Based on the first 4 yr of science data from the Fermi Gamma-ray Space Telescope mission, it is the deepest yet in this energy range. Relative to the Second Fermi LAT catalog, the 3FGL catalog incorporates twice as much data, as well as a number of analysis improvements, including improved calibrations at the event reconstruction level, an updated model for Galactic diffuse γ-ray emission, a refined procedure for source detection, and improved methods for associating LAT sources with potential counterparts at other wavelengths. The 3FGL catalog includes 3033 sources above significance, with source location regions, spectral properties, and monthly light curves for each. Of these, 78 are flagged as potentially being due to imperfections in the model for Galactic diffuse emission. Twenty-five sources are modeled explicitly as spatially extended, and overall 238 sources are considered as identified based on angular extent or correlated variability (periodic or otherwise) observed at other wavelengths. For 1010 sources we have not found plausible counterparts at other wavelengths. More than 1100 of the identified or associated sources are active galaxies of the blazar class; several other classes of non-blazar active galaxies are also represented in the 3FGL. Pulsars represent the largest Galactic source class. From source counts of Galactic sources we estimate that the contribution of unresolved sources to the Galactic diffuse emission is ∼3% at 1 GeV.

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    1359
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  • Erratum: THe second catalog of active galactic nuclei detected by the fermi large area telescope (Astrophysical Journal (2011) 743 (171))

    M. Ackermann, M. Ajello, A. Allafort, E. Antolini, W. B. Atwood, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, E. Bottacini, A. Bouvier, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, L. Costamante, S. Cutini, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, R. Dubois, L. Escande, C. Favuzzi, S. J. Fegan, E. C. Ferrara, J. Finke, W. B. Focke, P. Fortin, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, B. Giebels, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, S. Guiriec, M. Gustafsson, D. Hadasch, M. Hayashida, E. Hays, S. E. Healey, D. Horan, X. Hou, R. E. Hughes, G. Iafrate, G. Jóhannesson, A. S. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, M. N. Mazziotta, W. McConville

    Astrophysical Journal   806 ( 1 )  2015年06月

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  • Metal enrichment in the Fermi bubbles as a probe of their origin

    Yoshiyuki Inoue, Shinya Nakashima, Masaya Tahara, Jun Kataoka, Tomonori Totani, Yutaka Fujita, Yoshiaki Sofue

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   67 ( 3 )  2015年06月  [査読有り]

    　概要を見る

    The Fermi bubbles are gigantic gamma-ray structures in our Galaxy. The physical origin of the bubbles is still under debate. The leading scenarios can be divided into two categories. One is nuclear star-forming activity similar to extragalactic starburst galaxies and the other is past active galactic nucleus (AGN)-like activity of the Galactic center supermassive black hole. In this letter, we propose that metal abundance measurements will provide an important clue to probe their origin. Based on a simple spherically symmetric bubble model, we find that the generated metallicity and abundance patterns of the bubbles' gas strongly depend on assumed star formation or AGN activities. Star formation scenarios predict higher metallicities and abundance ratios of [O/Fe] and [Ne/Fe] than AGN scenarios do because of supernovae ejecta. Furthermore, the resultant abundance depends on the gamma-ray emission process because different mass injection histories are required for the different gamma-ray emission processes due to the acceleration and cooling time scales of non-thermal particles. Future X-ray missions such as ASTRO-H and Athena will give a clue to probe the origin of the bubbles through abundance measurements with their high energy resolution instruments.

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    9
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  • Recent progress of MPPC-based scintillation detectors in high precision X-ray and gamma-ray imaging

    J. Kataoka, A. Kishimoto, T. Fujita, T. Nishiyama, Y. Kurei, T. Tsujikawa, T. Oshima, T. Taya, Y. Iwamoto, H. Ogata, H. Okochi, S. Ohsuka, H. Ikeda, S. Yamamoto

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   784   248 - 254  2015年06月  [査読有り]

    　概要を見る

    The multi-pixel photon counter (MPPC) is a promising light sensor for various applications, not only in physics experiments but also in nuclear medicine, industry, and even high-energy astrophysics. In this paper, we present the current status and most recent progress of the MPPC-based scintillation detectors, such as (1) a high-precision X-ray and gamma-ray spectral image sensor, (2) next-generation PET detectors with MRI, TOF, and DOI measurement capabilities, and (3) a compact gamma camera for environmental radiation surveys. We first present a new method of fabricating a Ce:GAGG scintillator plate (1 or 2 mm thick) with ultra-fine resolution (0.2 mm/pixel), cut using a dicing saw to create 50 mu m wide micro-grooves. When the plate is optically coupled with a large-area MPPC array, excellent spatial resolution of 0.48 mm (FWHM) and energy resolution of 14% (FWHM) are obtained for 122 keV gamma rays. Hence, the detector can act as a convenient "multi-color" imaging device that can potentially be used for future SPECT and photon-counting CT. We then show a prototype system for a high-resolution MPPC-based PET scanner that can realize similar or equal to 1 mm (FWHM) spatial resolution, even under a strong magnetic field of 4.7 T. We develop a front-end ASIC intended for future TOF-PET scanner with a 16-channel readout that achieves a coincidence time resolution of 489 ps (FWHM). A novel design for a module with DOI-measurement capability for gamma rays is also presented by measuring the pulse height ratio of double-sided MPPCs coupled at both ends of scintillation crystal block. Finally, we present the concept of a two-plane Compton camera consisting of Ce:GAGG scintillator arrays coupled with thin MPPC arrays. As a result of the thin and compact features of the MPPC device, the camera not only achieves a small size (14 x 14 x 15 cm(3)) and light weight (1.9 kg) but also excellent sensitivity, compared to the conventional PMT-based pinhole camera used in Fukushima. Finally, we briefly describe a new product recently developed in conjunction with Hamamatsu Photonics K.K. that offers improved sensitivity and angular resolution of Delta theta similar to 8 degrees (FWHM) at 662 key, by incorporating DOI-segmented scintillator arrays. (C) 2014 Elsevier B.V. All rights reserved.

    DOI

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  • MPPCを基盤としたシンチレーション検出器を用いたX線・ガンマ線イメージングの最新動向

    J.Kataoka

    Nuclear Instruments and Method, Section-A   784   248 - 254  2015年06月  [査読有り]

    DOI

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    53
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  • The CALorimetric Electron Telescope (CALET) for high-energy astroparticle physics on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, J. H. Buckley, G. Castellini, M. L. Cherry, G. Collazuol, K. Ebisawa, V. Di Felice, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, M. H. Israel, A. Javaid, E. Kamioka, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, N. Kawanaka, H. Kitamura, T. Kotani, H. S. Krawczynski, J. F. Krizmanic, A. Kubota, S. Kuramata, T. Lomtadze, P. Maestro, L. Marcelli, P. S. Marrocchesi, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, T. Sakamoto, M. Sasaki, M. Shibata, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    EPJ Web of Conferences   95  2015年05月

    　概要を見る

    The CALorimetric Electron Telescope (CALET) is a space experiment, currently under development by Japan in collaboration with Italy and the United States, which will measure the flux of cosmic-ray electrons (and positrons) up to 20 TeV energy, of gamma rays up to 10 TeV, of nuclei with Z from 1 to 40 up to 1 PeV energy, and will detect gamma-ray bursts in the 7 keV to 20 MeV energy range during a 5 year mission. These measurements are essential to investigate possible nearby astrophysical sources of high energy electrons, study the details of galactic particle propagation and search for dark matter signatures. The main detector of CALET, the Calorimeter, consists of a module to identify the particle charge, followed by a thin imaging calorimeter (3 radiation lengths) with tungsten plates interleaving scintillating fibre planes, and a thick energy measuring calorimeter (27 radiation lengths) composed of lead tungstate logs. The Calorimeter has the depth, imaging capabilities and energy resolution necessary for excellent separation between hadrons, electrons and gamma rays. The instrument is currently being prepared for launch (expected in 2015) to the International Space Station ISS, for installation on the Japanese Experiment Module - Exposure Facility (JEM-EF).

    DOI

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  • MULTI-WAVELENGTH OBSERVATIONS OF THE BLACK WIDOW PULSAR 2FGL J2339.6-0532 WITH OISTER AND SUZAKU

    Yoichi Yatsu, Jun Kataoka, Yosuke Takahashi, Yutaro Tachibana, Nobuyuki Kawai, Shimpei Shibata, Sean Pike, Taketoshi Yoshii, Makoto Arimoto, Yoshihiko Saito, Takeshi Nakamori, Kazuhiro Sekiguchi, Daisuke Kuroda, Kenshi Yanagisawa, Hidekazu Hanayama, Makoto Watanabe, Ko Hamamoto, Hikaru Nakao, Akihito Ozaki, Kentaro Motohara, Masahiro Konishi, Ken Tateuchi, Noriyuki Matsunaga, Tomoki Morokuma, Takahiro Nagayama, Katsuhiro Murata, Hiroshi Akitaya, Michitoshi Yoshida, Gamal B. Ali, A. Essam Mohamed, Mizuki Isogai, Akira Arai, Hidenori Takahashi, Osamu Hashimoto, Ryo Miyanoshita, Toshihiro Omodaka, Jun Takahashi, Noritaka Tokimasa, Kentaro Matsuda, Shin-Ichiro Okumura, Kota Nishiyama, Seitaro Urakawa, Daisaku Nogami, Yumiko Oasa

    ASTROPHYSICAL JOURNAL   802 ( 2 )  2015年04月

    　概要を見る

    Multi-wavelength observations of the black widow binary system 2FGL J2339.6-0532 are reported. The Fermi gamma-ray source 2FGL J2339.6-0532 was recently categorized as a black widow in which a recycled millisecond pulsar (MSP) is evaporating the companion star with its powerful pulsar wind. Our optical observations show clear sinusoidal light curves due to the asymmetric temperature distribution of the companion star. Assuming a simple geometry, we constrained the range of the inclination angle of the binary system to 52 degrees &lt; i &lt; 59 degrees, which enables us to discuss the interaction between the pulsar wind and the companion in detail. The X-ray spectrum consists of two components: a soft, steady component that seems to originate from the surface of the MSP, and a hard, variable component from the wind-termination shock near the companion star. The measured X-ray luminosity is comparable to the bolometric luminosity of the companion, meaning that the heating efficiency is less than 0.5. In the companion orbit, 10(11) cm from the pulsar, the pulsar wind is already in the particle-dominant stage with a magnetization parameter of sigma &lt; 0.1. In addition, we precisely investigated the time variations of the X-ray periodograms and detected a weakening of the orbital modulation. The observed phenomenon may be related to unstable pulsar wind activity or weak mass accretion, both of which can result in the temporal extinction of the radio pulse.

    DOI

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    9
    被引用数
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  • MULTI-WAVELENGTH OBSERVATIONS OF THE BLACK WIDOW PULSAR 2FGL J2339.6-0532 WITH OISTER AND SUZAKU

    Yoichi Yatsu, Jun Kataoka, Yosuke Takahashi, Yutaro Tachibana, Nobuyuki Kawai, Shimpei Shibata, Sean Pike, Taketoshi Yoshii, Makoto Arimoto, Yoshihiko Saito, Takeshi Nakamori, Kazuhiro Sekiguchi, Daisuke Kuroda, Kenshi Yanagisawa, Hidekazu Hanayama, Makoto Watanabe, Ko Hamamoto, Hikaru Nakao, Akihito Ozaki, Kentaro Motohara, Masahiro Konishi, Ken Tateuchi, Noriyuki Matsunaga, Tomoki Morokuma, Takahiro Nagayama, Katsuhiro Murata, Hiroshi Akitaya, Michitoshi Yoshida, Gamal B. Ali, A. Essam Mohamed, Mizuki Isogai, Akira Arai, Hidenori Takahashi, Osamu Hashimoto, Ryo Miyanoshita, Toshihiro Omodaka, Jun Takahashi, Noritaka Tokimasa, Kentaro Matsuda, Shin-Ichiro Okumura, Kota Nishiyama, Seitaro Urakawa, Daisaku Nogami, Yumiko Oasa

    ASTROPHYSICAL JOURNAL   802 ( 2 ) 84  2015年04月  [査読有り]

    　概要を見る

    Multi-wavelength observations of the black widow binary system 2FGL J2339.6-0532 are reported. The Fermi gamma-ray source 2FGL J2339.6-0532 was recently categorized as a black widow in which a recycled millisecond pulsar (MSP) is evaporating the companion star with its powerful pulsar wind. Our optical observations show clear sinusoidal light curves due to the asymmetric temperature distribution of the companion star. Assuming a simple geometry, we constrained the range of the inclination angle of the binary system to 52 degrees &lt; i &lt; 59 degrees, which enables us to discuss the interaction between the pulsar wind and the companion in detail. The X-ray spectrum consists of two components: a soft, steady component that seems to originate from the surface of the MSP, and a hard, variable component from the wind-termination shock near the companion star. The measured X-ray luminosity is comparable to the bolometric luminosity of the companion, meaning that the heating efficiency is less than 0.5. In the companion orbit, 10(11) cm from the pulsar, the pulsar wind is already in the particle-dominant stage with a magnetization parameter of sigma &lt; 0.1. In addition, we precisely investigated the time variations of the X-ray periodograms and detected a weakening of the orbital modulation. The observed phenomenon may be related to unstable pulsar wind activity or weak mass accretion, both of which can result in the temporal extinction of the radio pulse.

    DOI

    Scopus

    9
    被引用数
    (Scopus)

  • すざく衛星によるフェルミバブルの観測：MAXI-SSCで発見された北端キャップと南東爪構造

    田原将也, 片岡淳, 竹内勇人ほか

    The Astrophysical Journal   802 ( 2 ) 91  2015年04月  [査読有り]

    DOI

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    21
    被引用数
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  • Multi-wavelength Observations of the Black Widow Pulsar 2FGL J2339.6-0532 with OISTER and Suzaku

    Yatsu, Y, Kataoka, J, Takahashi, Y, Tachibana, Y, Kawai, N, Shibata, S, Pike, S, Yoshii, T, Arimoto, M, Saito, Y, Nakamori, T, Sekiguchi, K, Kuroda, D, Yanagisawa, K, Hanayama, H, Watanabe, M, Hamamoto, K, Nakao, H, Ozaki, A, Motohara, K, Konishi, M, Tateuchi, K, Matsunaga, N, Morokuma, T, Nagayama, T, Murata, K, Akitaya, H, Yoshida, M, Ali, G. B, Essam Mohamed, A, Isogai, M, Arai, A, Takahashi, H, Hashimoto, O, Miyanoshita, R, Omodaka, T, Takahashi, J, Tokimasa, N, Matsuda, K, Okumura, S.-i, Nishiyama, K, Urakawa, S, Nogami, D, Oasa, Y, OISTER Team

    The Astrophysical Journal   802   84  2015年03月  [査読有り]

    DOI

  • Six Years of Fermi-LAT and Multi-Wavelength Monitoring of the Broad-Line Radio Galaxy 3c 120: Jet Dissipation At Sub-Parsec Scales from the Central Engine

    Tanaka Y.~T, Doi A, Inoue Y, Cheung C.~C, Stawarz L, Fukazawa Y, Gurwell M.~A, Tahara M, Kataoka J, Itoh R

    The Astrophysical Journal Letters   799 ( 2 ) L18 - 6  2015年02月  [査読有り]

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    17
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  • The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV

    M. Ackermann, M. Ajello, A. Albert, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, A. Cuoco, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, C. Favuzzi, E. C. Ferrara, W. B. Focke, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, G. Godfrey, G. A. Gomez-Vargas, I. A. Grenier, S. Guiriec, M. Gustafsson, D. Hadasch, K. Hayashi, E. Hays, J. W. Hewitt, P. Ippoliti, T. Jogler, G. Jóhannesson, A. S. Johnson, W. N. Johnson, T. Kamae, J. Kataoka, J. Knödlseder, M. Kuss, S. Larsson, L. Latronico, J. Li, L. Li, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, A. Manfreda, F. Massaro, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, R. Nemmen, E. Nuss, T. Ohsugi

    Astrophysical Journal   799 ( 1 )  2015年01月

    　概要を見る

    The γ-ray sky can be decomposed into individually detected sources, diffuse emission attributed to the interactions of Galactic cosmic rays with gas and radiation fields, and a residual all-sky emission component commonly called the isotropic diffuse γ-ray background (IGRB). The IGRB comprises all extragalactic emissions too faint or too diffuse to be resolved in a given survey, as well as any residual Galactic foregrounds that are approximately isotropic. The first IGRB measurement with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi ) used 10 months of sky-survey data and considered an energy range between 200 MeV and 100 GeV. Improvements in event selection and characterization of cosmic-ray backgrounds, better understanding of the diffuse Galactic emission (DGE), and a longer data accumulation of 50 months allow for a refinement and extension of the IGRB measurement with the LAT, now covering the energy range from 100 MeV to 820 GeV. The IGRB spectrum shows a significant high-energy cutoff feature and can be well described over nearly four decades in energy by a power law with exponential cutoff having a spectral index of 2.32 ± 0.02 and a break energy of (279 ± 52) GeV using our baseline DGE model. The total intensity attributed to the IGRB is (7.2 ± 0.6) x 10-6 cm-2 s-1 sr-1 above 100 MeV, with an additional +15%/-30% systematic uncertainty due to the Galactic diffuse foregrounds.

    DOI

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  • 27pSJ-1 CTA報告96 : 全体報告

    手嶋 政廣, 窪 秀利, 戸谷 友則, 浅野 勝晃, 井岡 邦仁, 池野 祐平, 石尾 一馬, 稲田 知大, 井上 進, 井上 剛志, 井上 芳幸, 猪目 祐介, 岩村 由樹, 内山 泰伸, 梅津 陽平, 大石 理子, 大岡 秀行, 大平 豊, 奥村 曉, 小野 祥弥, 折戸 玲子, 加賀谷 美佳, 格和 純, 片岡 淳, 片桐 秀明, 加藤 翔, 掃部 寛隆, 河島 孝則, 川中 宣太, 木坂 将大, 岸田 柊, 櫛田 淳子, 郡司 修一, 郡 和範, 小山 志勇, 今野 裕介, 齋藤 隆之, 榊 直人, 佐藤 雄太, 佐野 栄俊, 澤田 真理, 重中 茜, 柴田 徹, 高橋 慶太郎, 高橋 弘充, 高橋 光成, 高見 将太, 武田 淳希, 田島 宏康, 立原 研悟, 田中 周太, 田中 孝明, 田中 真伸, 田中 康之, 谷川 俊介, 千川 道幸, 長 紀仁, 辻本 晋平, 鶴 剛, 寺田 幸功, 當真 賢二, 門叶 冬樹, 友野 弥生, 鳥居 和史, 内藤 統也, 中嶋 大輔, 長瀧 重博, 中森 健之, 中山 和則, 永吉 勤, 西嶋 恭司, 野田 浩司, 畑中 謙一郎, 早川 貴敬, 林田 将明, 原 敏, 馬場 彩, 日高 直哉, 平井 亘, 広谷 幸一, 深沢 泰司, 深見 哲志, 福井 康雄, 福田 達哉, 藤田 裕, 増田 周, 松岡 俊介, 松本 浩典, 水野 恒史, 村石 浩, 村瀬 孔大, 本橋 大輔, 森 浩二, 柳田 昭平, 山崎 了, 山根 暢仁, 山本 常夏, 山本 宏昭, 吉池 智史, 吉越 貴紀, 吉田 篤正, 吉田 龍生, 吉田 麻佑, 李 兆衡, Tan Dang Viet, Hadasch Daniela, Mazin Daniel, CTA Japan Collaboration

    日本物理学会講演概要集   70   390 - 390  2015年

    DOI CiNii

  • 25pSJ-3 ASTRO-H衛星搭載軟ガンマ線検出器の衛星総合試験における試験結果

    林 克洋, 田島 宏康, 深沢 泰司, 渡辺 伸, 内山 秀樹, 内山 泰伸, 榎戸 輝揚, 太田 方之, 大野 雅功, 小高 裕和, 片岡 淳, 国分 紀秀, 佐藤 悟朗, 佐藤 理江, 高橋 忠幸, 武田 伸一郎, 田代 信, 田中 孝明, 寺田 幸功, 中澤 知洋, 中森 健之, 原山 淳, Blandford Roger, 牧島 一夫, Madejski Grzegorz, 水野 恒史, 森 國城, 谷津 陽一, 山岡 和貴, 山田 真也, 湯浅 孝行, 米徳 大輔, Laurent Philippe, Limousin Olivier, Lebrun Francois, SGDチーム

    日本物理学会講演概要集   70   351 - 351  2015年

    DOI CiNii

  • 24aDJ-3 硬X線偏光検出器PoGOLite気球実験 : 2016年の再フライトへ向けて

    高橋 弘充, 河野 貴文, 水野 恒史, 深沢 泰司, 釜江 常好, 片岡 淳, 田島 宏康, 高橋 忠幸, 河合 誠之, Pearce M., Chauvin M., Kiss M., Kole M., Mikhalev V., Moretti E., PoGOLiteチーム

    日本物理学会講演概要集   70   495 - 495  2015年

    DOI CiNii

  • 23pDK-3 ASTRO-H衛星搭載軟ガンマ線検出器の衛星搭載器試験結果

    田島 宏康, 深沢 泰司, 渡辺 伸, 内山 秀樹, 内山 泰伸, 榎戸 輝揚, 太田 方之, 大野 雅功, 小高 裕和, 片岡 淳, 川原田 円, 国分 紀秀, 佐藤 悟朗, 佐藤 理江, 高橋 忠幸, 高橋 弘充, 武田 伸一郎, 田代 信, 田中 孝明, 田中 康之, 寺田 幸功, 中澤 知洋, 中森 健之, 林 克洋, Blandford Roger, 牧島 一夫, Madejski Grzegorz, 水野 恒史, 森國 城, 谷津 陽一, 山岡 和貴, 山田 真也, 米徳 大輔, Laurent Philippe, Limousin Olivier, Lebrun Francois, SGDチーム

    日本物理学会講演概要集   70   470 - 470  2015年

    DOI CiNii

  • 21pDD-12 フェルミ衛星によるBroad Line Radio Galaxy 3C 120のモニター観測と多波長データによるMeV/GeVガンマ線放射位置と放射機構の探査

    田中 康之, 土居 明広, 井上 芳幸, Cheung C. C., Stawarz L., 深沢 泰司, Gurwell M. A., 田原 将也, 片岡 淳, 伊藤 亮介

    日本物理学会講演概要集   70   416 - 416  2015年

    DOI CiNii

  • 23pCF-13 次世代CTを目指した高精細カラー放射線イメージセンサの開発(I)

    大島 翼, 片岡 淳, 岸本 彩, 藤田 卓也, 呉井 洋太, 西山 徹, 山本 誠一, 尾川 浩一

    日本物理学会講演概要集   70   364 - 364  2015年

    DOI CiNii

  • Development and evaluation of an ultra-fast ASIC for future PET scanners using TOF-capable MPPC array detectors

    T. Ambe, H. Ikeda, J. Kataoka, H. Matsuda, T. Kato

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   771   66 - 73  2015年01月  [査読有り]

    　概要を見る

    We developed a front-end AMC for future PET scanners with Time-Of-Flight (TOF) capability to be coupled with 4 x 4 Multi-Pixel Photon Counter (MPPC) arrays. The ASIC is designed based on the open-IP project proposed by JAXA and realized in TSNIC 0.35 mu m CMOS technology. The circuit comprises 16-channel, low impedance current conveyors for effectively acquiring fast MPPC signals. For precise measurement of the coincidence timing of 511-keV gamma rays, the leading-edge method was used to discriminate the signals. We First tested the time response of the FOC by illuminating each channel of a MPPC array device 3 x 3 mm(2) in size with a Pico-second Light Pulsar with a light emission peak of 655 nm and pulse duration of 54 ps (FWHM). We obtained 105 ps (FWHM) on average for each channel in time jitter measurements. Moreover, we compensated for the time lag of each channel with inner delay circuits and succeeded in suppressing about a 700-ps lag to only 15 ps. This paper reports TOE measurements using back-to-back 511-key signals, and suggests that the ASIC can be a promising device for future TOF-PET scanners based on the MPPC array. (C) 2014 Published by Elsevier B.V.

    DOI

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    3
    被引用数
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  • TSV-MPPCとダイシングシンチレータを用いた高精度多色ガンマ線イメージャの開発

    大島 翼, 片岡 淳, 岸本 彩ほか

    Nuclear instruments & methods in physics research. Section A   803   8 - 14  2015年  [査読有り]

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    14
    被引用数
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  • Status and performance of the CALorimetric Electron Telescope (CALET) on the international space station

    O. Adriani, Y. Akaike, Y. Asaoka, K. Asano, M. G. Bagliesi, G. Bigongiari, W. R. Binns, M. Bongi, J. H. Buckley, A. Cassese, G. Castellini, M. L. Cherry, G. Collazuol, K. Ebisawa, V. di Felice, H. Fuke, T. G. Guzik, T. Hamsa, N. Hasebe, M. Hareyama, K. Hibino, M. Ichimura, K. Ioka, M. H. Israel, A. Javaid, E. Kamioka, K. Kasahara, Y. Katayose, J. Kataoka, R. Kataoka, N. Kawanaka, H. Kitamura, T. Kotani, H. S. Krawczynski, J. F. Krizmanic, A. Kubota, S. Kuramata, T. Lomtadze, P. Maestro, L. Marcelli, P. S. Marrocchesi, J. W. Mitchell, S. Miyake, K. Mizutani, H. M. Motz, A. A. Moiseev, K. Mori, M. Mori, N. Mori, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, F. Palma, P. Papini, B. F. Rauch, S. Ricciarini, T. Sakamoto, M. Sasaki, M. Shibata, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Nuclear Physics B - Proceedings Supplements   256-257   225 - 232  2014年12月

    　概要を見る

    The CALorimetric Electron Telescope (CALET) space experiment, currently under development by Japan in collaboration with Italy and the United States, will measure the flux of cosmic-ray electrons (including positrons) to 20 TeV, gamma rays to 10 TeV and nuclei with Z=1 to 40 up to 1,000 TeV during a two-year mission on the International Space Station (ISS), extendable to five years. These measurements are essential to search for dark matter signatures, investigate the mechanism of cosmic-ray acceleration and propagation in the Galaxy and discover possible astrophysical sources of high-energy electrons nearby the Earth. The instrument consists of two layers of segmented plastic scintillators for the cosmic-ray charge identification (CHD), a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter (IMC) and a 27 radiation length thick lead-tungstate calorimeter (TASC). CALET has sufficient depth, imaging capabilities and excellent energy resolution to allow for a clear separation between hadrons and electrons and between charged particles and gamma rays. The instrument will be launched to the ISS within 2014 Japanese Fiscal Year (by the end of March 2015) and installed on the Japanese Experiment Module-Exposed Facility (JEM-EF). In this paper, we will review the status and main science goals of the mission and describe the instrument configuration and performance.

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  • Development of prototype PET scanner using dual-sided readout DOI-PET modules

    T. Fujita, J. Kataoka, A. Kishimoto, Y. Kurei, T. Nishiyama, T. Ohshima, T. Taya

    JOURNAL OF INSTRUMENTATION   9 ( 12 ) P12015  2014年12月  [査読有り]

    　概要を見る

    In our previous work, we proposed a novel design for a gamma-ray detector module capable of measuring the depth of interaction (DOI). In this paper, we further developed DOI-PET detector modules and a data acquisition system, and evaluated its performance. Each detector module was composed of a 3-D scintillator array and two large-area monolithic Multi-Pixel Photon Counter (MPPC) arrays coupled to both ends of the 3-D scintillator array, leading to only 8-ch signal outputs from a module. The 3-D scintillator array was composed of 9 x 9 x 7 matrices of 1.0 x 1.0 x 3.0 mm(3) Ce:GAGG crystals. The detector module showed good energy resolution of 10.6% as measured at 511 keV and a high average peak to valley ratio higher than 8 for each pixel crystal identified in the X-Y-Z directions. Moreover, we evaluated the spatial resolution of a virtual 18-ch PET gantry simulated by using two detector modules that were flexibly controlled using both the X-stage and theta-stage in 20-degree steps. By measuring a Na-22 point source (0.25 mm in diameter), we showed that spatial resolution substantially degrades from 1.0 mm to 7.8 mm (FWHM; as measured at 0 mm and 28 mm off-center) with a non-DOI configuration, whereas the corresponding values for the DOI configuration were 0.9 mm and 1.5 mm, respectively (FWHM; as measured at 0 mm and 28 mm off-center). This preliminary study confirms that our DOI-PET module is useful for future high spatial resolution and compact small-animal PET scanners without radial image distortions at the peripheral regions of the field of view (FOV).

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  • A novel Compton camera design featuring a rear-panel shield for substantial noise reduction in gamma-ray images

    T. Nishiyama, J. Kataoka, A. Kishimoto, T. Fujita, Y. Iwamoto, T. Taya, S. Ohsuka, S. Nakamura, M. Hirayanagi, N. Sakurai, S. Adachi, T. Uchiyama

    JOURNAL OF INSTRUMENTATION   9 ( 12 ) C12031  2014年12月  [査読有り]

    　概要を見る

    After the Japanese nuclear disaster in 2011, large amounts of radioactive isotopes were released and still remain a serious problem in Japan. Consequently, various gamma cameras are being developed to help identify radiation hotspots and ensure effective decontamination operation. The Compton camera utilizes the kinematics of Compton scattering to contract images without using a mechanical collimator, and features a wide field of view. For instance, we have developed a novel Compton camera that features a small size (13x14x15 cm(3)) and light weight (1.9 kg), but which also achieves high sensitivity thanks to Ce:GAGG scintillators optically coupled wiith MPPC arrays. By definition, in such a Compton camera, gamma rays are expected to scatter in the "scatterer" and then be fully absorbed in the "absorber" (in what is called a forward-scattered event). However, high energy gamma rays often interact with the detector in the opposite direction-initially scattered in the absorber and then absorbed in the scatterer-in what is called a "back-scattered" event. Any contamination of such back-scattered events is known to substantially degrade the quality of gamma-ray images, but determining the order of gamma-ray interaction based solely on energy deposits in the scatterer and absorber is quite difficult. For this reason, we propose a novel yet simple Compton camera design that includes a rear-panel shield (a few mm thick) consisting of W or Pb located just behind the scatterer. Since the energy of scattered gamma rays in back-scattered events is much lower than that in forward-scattered events, we can effectively discriminate and reduce back-scattered events to improve the signal-to-noise ratio in the images. This paper presents our detailed optimization of the rear-panel shield using Geant4 simulation, and describes a demonstration test using our Compton camera.

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  • Development of a MPPC-based prototype gantry for future MRI-PET scanners

    Y. Kurei, J. Kataoka, T. Kato, T. Fujita, T. Ohshima, T. Taya, S. Yamamoto

    JOURNAL OF INSTRUMENTATION   9 ( 12 ) C12052  2014年12月  [査読有り]

    　概要を見る

    We have developed a high spatial resolution, compact Positron Emission Tomography (PET) module designed for small animals and intended for use in magnetic resonance imaging (MRI) systems. This module consists of large-area, 4x4 ch MPPC arrays (S11830-3344MF; Hamamatsu Photonics K. K.) optically coupled with Ce-doped (Lu, Y)(2)(SiO4)O (Ce: LYSO) scintillators fabricated into 16 x 16 matrices of 0.5 x 0.5 mm(2) pixels. We set the temperature sensor (LM73CIMK-0; National Semiconductor Corp.) at the rear of the MPPC acceptance surface, and apply optimum voltage to maintain the gain. The eight MPPC-based PET modules and coincidence circuits were assembled into a gantry arranged in a ring 90 mmin diameter to form the MPPC-based PET system. We have developed two types PET gantry: one made of non-magnetic metal and the other made of acrylonitrile butadiene styrene (ABS) resins. The PET gantry was positioned around the RF coil of the 4.7 T MRI system. We took an image of a point Na-22 source under fast spin echo (FSE) and gradient echo (GE), in order to measure the interference between the MPPC-based PET and MRI. The spatial resolution of PET imaging in a transaxial plane of about 1 mm (FWHM) was achieved in all cases. Operating with PET made of ABS has no effect on MR images, while operating with PET made of non-magnetic metal has a significant detrimental effect on MR images. This paper describes our quantitative evaluations of PET images and MR images, and presents a more advanced version of the gantry for future MRI/DOI-PET systems.

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  • Performance and field tests of a handheld Compton camera using 3-D position-sensitive scintillators coupled to multi-pixel photon counter arrays

    A. Kishimoto, J. Kataoka, T. Nishiyama, T. Fujita, K. Takeuchi, H. Okochi, H. Ogata, H. Kuroshima, S. Ohsuka, S. Nakamura, M. Hirayanagi, S. Adachi, T. Uchiyama, H. Suzuki

    JOURNAL OF INSTRUMENTATION   9 ( 11 )  2014年11月  [査読有り]

    　概要を見る

    After the nuclear disaster in Fukushima, radiation decontamination has become particularly urgent. To help identify radiation hotspots and ensure effective decontamination operation, we have developed a novel Compton camera based on Ce-doped Gd3Al2Ga3O12 scintillators and multi-pixel photon counter (MPPC) arrays. Even though its sensitivity is several times better than that of other cameras being tested in Fukushima, we introduce a depth-of-interaction (DOI) method to further improve the angular resolution. For gamma rays, the DOI information, in addition to 2-D position, is obtained by measuring the pulse-height ratio of the MPPC arrays coupled to ends of the scintillator. We present the detailed performance and results of various field tests conducted in Fukushima with the prototype 2-D and DOI Compton cameras. Moreover, we demonstrate stereo measurement of gamma rays that enables measurement of not only direction but also approximate distance to radioactive hotspots.

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    51
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  • Qualification test of a MPPC-based PET module for future MRI-PET scanners

    Y. Kurei, J. Kataoka, T. Kato, T. Fujita, H. Funamoto, T. Tsujikawa, S. Yamamoto

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   765   275 - 279  2014年11月  [査読有り]

    　概要を見る

    We have developed a high-resolution, compact Positron Emission Tomography (PET) module for future use in MRI-PET scanners. The module consists of large-area, 4 x 4 ch MPPC arrays (Hamamatsu S11827-3344MG) optically coupled with Ce:LYSO scintillators fabricated into 12 x 12 matrices of 1 x 1 mm(2) pixels. At this stage, a pair of module and coincidence circuits was assembled into an experimental prototype gantry arranged in a ring of 90 mm in diameter to form the MPPC-based PET system. The PET detector ring was then positioned around the RF coil of the 4.7 T MRI system. We took an image of a point Na-22 source under fast spin echo (FSE) and gradient echo (GE), in order to measure interference between the MPPC-based PET and the MRI We only found a slight degradation in the spatial resolution of the PET image from 1.63 to 1.70 mm (FWHM; x-direction), or 1.48-1.55 mm (FWHM; y-direction) when operating with the MRI, while the signal-to-noise ratio (SNR) of the MRI image was only degraded by 5%. These results encouraged us to develop a more advanced version of the MRI-PET gantry with eight MPPC-based PET modules, whose detailed design and first qualification Lest are also presented in this paper. (C) 2014 Elsevier B.V. All rights reserved.

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  • Two-dimensional diced scintillator array for innovative, fine-resolution gamma camera

    T. Fujita, J. Kataoka, T. Nishiyama, S. Ohsuka, S. Nakamura, S. Yamamoto

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   765   262 - 268  2014年11月  [査読有り]

    　概要を見る

    We are developing a technique to fabricate fine spatial resolution (FWHM &lt; 0.5 mm) and cost-effective photon counting detectors, by using silicon photomultipliers (SiPMs) coupled with a finely pixelated scintillator plate. Unlike traditional X-ray imagers that use a micro-columnar CskTI) plate, we can pixelate various scintillation crystal plates more than 1 mm thick, and easily develop large-area, finepitch scintillator arrays with high precision. Coupling a fine pitch scintillator array with a SiPM array results in a compact, fast-response detector that is ideal for X-ray, gamma-ray, and charged particle detection as used in autoradiography, gamma cameras, and photon counting CTs. As the first step, we fabricated a 2-D, cerium-doped Gd3Al2Ga3O12 (Ce:GAGG) scintillator array of 0.25 mm pitch, by using a dicing saw to cut micro-grooves 50 um wide into a 1.0 mm thick Ce:GAGG plate. The scinfillator plate is optically coupled with a 3.0 x 3.0 mm pixel 4 x 4 SiPM array and read-out via the resistive chargedivision network. Even when using this simple system as a gamma camera, we obtained excellent spatial resolution of 0.48 mm (F\NHM) for 122 keV gamma-rays. We will present our plans to further improve the signal-to-noise ratio in the image, and also discuss a variety of possible applications in the near future. (C) 2014 Elsevier By, All rights reserved,

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  • “Stereo Compton cameras” for the 3-D localization of radioisotopes

    K.Takeuchi, J.Kataoka, T.Nishiyama

    Nuclear Instruments and Methods in Physics Research Section A   765 ( 21 ) 187 - 191  2014年11月  [査読有り]

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  • Performance of the latest MPPCs with reduced dark counts and improved photon detection efficiency

    T. Tsujikawa, H. Funamoto, J. Kataoka, T. Fujita, T. Nishiyama, Y. Kurei, K. Sato, K. Yamamura, S. Nakamura

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   765 ( 21 ) 247 - 251  2014年11月  [査読有り]

    　概要を見る

    We have tested the performance of two types of the latest Multi-Pixel Photon Counters (MPPCs; measuring 3 x 3 mm2 in size) developed by Hamamatsu Photonics K.K. The new S12572-050C is a successor to the S10362-33-050C (i.e., conventional 3 x 3-mm2 pixel MPPC of 50 pm pitch), comprises 3600 Geiger mode avalanche photodiodes (APDs), and also features high gain (up to 125 x 10(6)), a low dark count (up to 10(6) cps), and improved photon detection efficiency (PDE) by up to 30%. The S12572015C is a new type of fine-pitch (15 pM) MPPC featuring a wide dynamic range and fast timing response. This paper first presents the detailed performance of these latest MPPCs as photon counting devices. It then describes our fabrication of a prototype detector consisting of a MPPC optically coupled with a Ce: GAGG scintillator. We obtained average FVVHM energy resolutions o17,3% (15 mu M) and 6.7% (new-50 [iri), as compared Lo 6.9% (old-50 mu M) for 662-key gamma rays from the Cs-137 source, as measured at 20 degrees C. Moreover, the number of fired pixels for 662-keV gamma rays increased by 30% for the new-50 mu m (as compared to the old-50 mu m). We confirmed that the low energy threshold improved from 10 kV to 4 keY, when using the latest MPPC device (new-50 pm). We also confirmed that the timing resolution of the new MPPC is 50 ps or even better, as compared to 89 ps of the old MPPC. The results thus confirm that these new types of IVIPPCs are promising for various applications as scintillation detectors. (C) 2014 Elsevier B.V. All rights reserved.

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  • The spectrum and morphology of the Fermi bubbles

    M. Ackermann, A. Albert, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, L. Di Venere, E. Do Couto E Silva, P. S. Drell, C. Favuzzi, E. C. Ferrara, W. B. Focke, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, G. Godfrey, G. A. Gomez-Vargas, I. A. Grenier, S. Guiriec, D. Hadasch, A. K. Harding, E. Hays, J. W. Hewitt, X. Hou, T. Jogler, G. Jóhannesson, A. S. Johnson, W. N. Johnson, T. Kamae, J. Kataoka, J. Knödlseder, D. Kocevski, M. Kuss, S. Larsson, L. Latronico, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, D. Malyshev, A. Manfreda, F. Massaro, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, R. Nemmen, E. Nuss, T. Ohsugi, N. Omodei, M. Orienti, E. Orlando, J. F. Ormes, D. Paneque, J. H. Panetta

    Astrophysical Journal   793 ( 1 )  2014年09月

    　概要を見る

    The Fermi bubbles are two large structures in the gamma-ray sky extending to 55° above and below the Galactic center. We analyze 50 months of Fermi Large Area Telescope data between 100 MeV and 500 GeV above 10° in Galactic latitude to derive the spectrum and morphology of the Fermi bubbles. We thoroughly explore the systematic uncertainties that arise when modeling the Galactic diffuse emission through two separate approaches. The gamma-ray spectrum is well described by either a log parabola or a power law with an exponential cutoff. We exclude a simple power law with more than 7σ significance. The power law with an exponential cutoff has an index of 1.9 ± 0.2 and a cutoff energy of 110 ± 50 GeV. We find that the gamma-ray luminosity of the bubbles is erg s-1. We confirm a significant enhancement of gamma-ray emission in the southeastern part of the bubbles, but we do not find significant evidence for a jet. No significant variation of the spectrum across the bubbles is detected. The width of the boundary of the bubbles is estimated to be deg. Both inverse Compton (IC) models and hadronic models including IC emission from secondary leptons fit the gamma-ray data well. In the IC scenario, synchrotron emission from the same population of electrons can also explain the WMAP and Planck microwave haze with a magnetic field between 5 and 20 μG.

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  • Pre-flight performance of a micro-satellite TSUBAME for X-ray polarimetry of gamma-ray bursts

    Yatsu Yoichi, Ito Kei, Kurita Shin, Arimoto Makoto, Kawai Nobuyuki, Matsushita Masanori, Kawajiri Shota, Kitamura Shogo, Matunaga Saburo, Kimura Shin'ichi, Kataoka Jun, Nakamori Takeshi, Kubo Sin

    SPACE TELESCOPES AND INSTRUMENTATION 2014: ULTRAVIOLET TO GAMMA RAY   9144  2014年07月

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    5
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  • EXTREME BLAZARS STUDIED WITH FERMI-LAT AND SUZAKU: 1ES 0347-121 AND BLAZAR CANDIDATE HESS J1943+213

    Tanaka, Y. T, Stawarz, L, Finke, J, Cheung, C. C, Dermer, C. D, Kataoka, J, Bamba, A, Dubus, G, De Naurois, M, Wagner, S. J

    ASTROPHYSICAL JOURNAL   787 ( 2 )  2014年06月  [査読有り]

    　概要を見る

    We report on our study of high-energy properties of two peculiar TeV emitters: the extreme blazar&quot; 1ES 0347-121 and the &quot;extreme blazar candidate&quot; HESS J1943+213 located near the Galactic plane. Both objects are characterized by quiescent synchrotron emission with flat spectra extending up to the hard X-ray range, and both were reported to be missing GeV counterparts in the Fermi Large Area Telescope (LAT) two-year Source Catalog. We analyze a 4.5 yr accumulation of the Fermi-LAT data, resulting in the detection of 1ES 0347-121 in the GeV band, as well as in improved upper limits for HESS J1943+213. We also present the analysis results of newly acquired Suzaku data for HESS J1943+213. The X-ray spectrum is well represented by a single power law extending up to 25 keV with photon index 2.00 +/- 0.02 and a moderate absorption in excess of the Galactic value, which is in agreement with previous X-ray observations. No short-term X-ray variability was found over the 80 ks duration of the Suzaku exposure. Under the blazar hypothesis, we modeled the spectral energy distributions of 1ES 0347-121 and HESS J1943+213, and we derived constraints on the intergalactic magnetic fie

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    25
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  • Search for cosmic-ray-induced gamma-ray emission in galaxy clusters

    M. Ackermann, M. Ajello, A. Albert, A. Allafort, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. D. Bloom, E. Bonamente, E. Bottacini, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, E. Cavazzuti, R. C.G. Chaves, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, P. S. Drell, A. Drlica-Wagner, C. Favuzzi, A. Franckowiak, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, G. Godfrey, G. A. Gomez-Vargas, I. A. Grenier, S. Guiriec, M. Gustafsson, D. Hadasch, M. Hayashida, J. Hewitt, R. E. Hughes, T. E. Jeltema, G. Jóhannesson, A. S. Johnson, T. Kamae, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, R. Nemmen, E. Nuss, T. Ohsugi, M. Orienti, E. Orlando, J. F. Ormes, J. S. Perkins, M. Pesce-Rollins, F. Piron, G. Pivato, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, J. Ruan, M. Sánchez-Conde

    Astrophysical Journal   787 ( 1 )  2014年05月

    　概要を見る

    Current theories predict relativistic hadronic particle populations in clusters of galaxies in addition to the already observed relativistic leptons. In these scenarios hadronic interactions give rise to neutral pions which decay into γ rays that are potentially observable with the Large Area Telescope (LAT) on board the Fermi space telescope. We present a joint likelihood analysis searching for spatially extended γ-ray emission at the locations of 50 galaxy clusters in four years of Fermi-LAT data under the assumption of the universal cosmic-ray (CR) model proposed by Pinzke & Pfrommer. We find an excess at a significance of 2.7σ, which upon closer inspection, however, is correlated to individual excess emission toward three galaxy clusters: A400, A1367, and A3112. We discuss these cases in detail and conservatively attribute the emission to unmodeled background systems (for example, radio galaxies within the clusters).Through the combined analysis of 50 clusters, we exclude hadronic injection efficiencies in simple hadronic models above 21% and establish limits on the CR to thermal pressure ratio within the virial radius, R 200, to be below 1.25%-1.4% depending on the morphological classification. In addition, we derive new limits on the γ-ray flux from individual clusters in our sample. © 2014. The American Astronomical Society. All rights reserved.

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  • Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays

    J. Aleksić, S. Ansoldi, L. A. Antonelli, P. Antoranz, A. Babic, P. Bangale, U. Barres De Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, K. Berger, E. Bernardini, A. Biland, O. Blanch, R. K. Bock, S. Bonnefoy, G. Bonnoli, F. Borracci, T. Bretz, E. Carmona, A. Carosi, D. Carreto Fidalgo, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Da Vela, F. Dazzi, A. De Angelis, G. De Caneva, B. De Lotto, C. Delgado Mendez, M. Doert, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Eisenacher, D. Elsaesser, E. Farina, D. Ferenc, M. V. Fonseca, L. Font, K. Frantzen, C. Fruck, R. J. García López, M. Garczarczyk, D. Garrido Terrats, M. Gaug, G. Giavitto, N. Godinović, A. González Muñoz, S. R. Gozzini, A. Hadamek, D. Hadasch, A. Herrero, D. Hildebrand, J. Hose, D. Hrupec, W. Idec, V. Kadenius, H. Kellermann, M. L. Knoetig, J. Krause, J. Kushida, A. La Barbera, D. Lelas, N. Lewandowska, E. Lindfors, S. Lombardi, M. López, R. López-Coto, A. López-Oramas, E. Lorenz, I. Lozano, M. Makariev, K. Mallot, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, B. Marcote, M. Mariotti, M. Martínez, D. Mazin, U. Menzel, M. Meucci, J. M. Miranda, R. Mirzoyan, A. Moralejo, P. Munar-Adrover, D. Nakajima, A. Niedzwiecki, K. Nilsson, N. Nowak, R. Orito, A. Overkemping, S. Paiano

    Astronomy and Astrophysics   564  2014年04月

    　概要を見る

    Aims. The radio galaxy NGC≠1275, recently identified as a very high energy (VHE, >100 GeV) γ-ray emitter by MAGIC, is one of the few non-blazar active galactic nuclei detected in the VHE regime. The purpose of this work is to better understand the origin of the γ-ray emission and locate it within the galaxy. Methods. We studied contemporaneous multifrequency observations of NGC≠1275 and modeled the overall spectral energy distribution. We analyzed unpublished MAGIC observations carried out between October 2009 and February 2010, and the previously published observations taken between August 2010 and February 2011. We studied the multiband variability and correlations by analyzing data of Fermi-LAT in the 100 MeV-100 GeV energy band, as well as Chandra (X-ray), KVA (optical), and MOJAVE (radio) data taken during the same period. Results. Using customized Monte Carlo simulations corresponding to early MAGIC stereoscopic data, we detect NGC≠1275 also in the earlier MAGIC campaign. The flux level and energy spectra are similar to the results of the second campaign. The monthly light curve above 100 GeV shows a hint of variability at the 3.6σ level. In the Fermi-LAT band, both flux and spectral shape variabilities are reported. The optical light curve is also variable and shows a clear correlation with the γ-ray flux above 100 MeV. In radio, three compact components are resolved in the innermost part of the jet. One of these components shows a similar trend as the Fermi-LAT and KVA light curves. The γ-ray spectra measured simultaneously with MAGIC and Fermi-LAT from 100 MeV to 650 GeV can be well fitted either by a log-parabola or by a power-law with a subexponential cutoff for the two observation campaigns. A single-zone synchrotron-self-Compton model, with an electron spectrum following a power-law with an exponential cutoff, can explain the broadband spectral energy distribution and the multifrequency behavior of the source. However, this model suggests an untypical low bulk-Lorentz factor or a velocity alignment closer to the line of sight than the parsec-scale radio jet. © 2014 ESO.

    DOI

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  • Development of a Prototype Detector Using APD-Arrays Coupled With Pixelized Ce:GAGG Scintillator for High Resolution Radiation Imaging

    Kei Kamada, Kenji Shimazoe, Shigeki Ito, Masao Yoshino, Takanori Endo, Kousuke Tsutsumi, Jun Kataoka, Shunsuke Kurosawa, Yuui Yokota, Hiroyuki Takahashi, Akira Yoshikawa

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   61 ( 1 ) 348 - 352  2014年02月  [査読有り]

    　概要を見る

    A novel digital PET scanner based on Time over Threshold method is developed. The positron emission tomography (PET) is composed of 144channel Ce:Gd3Al2Ga3O12 (GAGG)-Avaranche photodiode (APD) detector arrays individually coupled with custom designed Time over Threshold (ToT) application-specific integrated circuit (ASIC) to realize the high count rate and good spatial resolution. Such an imaging system provides a simple front-end circuit and flexible digital signal processing like multiplexing such as a pulse train method. The measured energy resolution of the detector system was 6.7% for the 511 keV peak, and 4.25 ns time resolution was measured with a single detector module. The measured spatial resolution for a point source was 1.37 mm FWHM for our initial data with a columnar Na-22 source.

    DOI

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    18
    被引用数
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  • Observational aspects of AGN jets at high energy

    Jun Kataoka

    Proceedings of the International Astronomical Union   10 ( S313 ) 1 - 11  2014年

    　概要を見る

    For the last two decades, significant and dramatic progress has been made in understanding astrophysical jet sources, particularly in the X-ray and gamma-ray energy bands. For example, the Chandra X-ray observatory reveals a number of AGN jets extending from kpc to Mpc scales. More recently, the Fermi Gamma-ray Space Telescopes launched in 2008 started monitoring the gamma-ray sky with excellent sensitivity of about ten times greater than that of EGRET onboard CGRO, and has detected more than 2, 000 sources (mostly AGNs) as of 2014. Moreover, Fermi-LAT has discovered gamma-ray emissions not only from blazars but from a dozen radio galaxies not previously known to emit gamma-rays. Closer to home, the Fermi-bubbles were discovered to extend 50 degrees above and below the Galactic center. These large scale diffuse gamma-ray structures are similar in structure to AGN lobes such as those seen in Cen A and provide evidence for past activity in our Galactic center. In this review, I will first summarize recent highlights of large scale jets in radio galaxies, specifically resolved by the Chandra X-ray observatory. Next I will move on to the gamma-ray sky to present some highlights from Fermi-LAT observations of "misaligned" blazars, namely radio galaxies. I will discuss a unification scheme connecting blazars and misaligned radio galaxies. In the last part, I will also briefly comment on recent multiband observations of the Fermi-bubble and possible impacts on the AGN jet physics in the near future.

    DOI

  • ASTRO-H White Paper - Plasma Diagnostic and Dynamics of the Galactic Center Region

    K. Koyama, J. Kataoka, M. Nobukawa, H. Uchiyama, S. Nakashima, F. Aharonian, M. Chernyakova, Y. Ichinohe, K. K. Nobukawa, Y. Maeda, H. Matsumoto, H. Murakami, C. Ricci, L. Stawarz, T. Tanaka, T. G. Tsuru, S. Watanabe, S. Yamauchi, T. Yuasa, for the ASTRO-H, Science Working Group

    arXiv    2014年

  • Development and verification of signal processing system of BGO active shield onboard Astro-H

    Masanori Ohno, Shin'ya Tokuda, Takafumi Kawano, Shunya Furui, Ikumi Edahiro, Hiromitsu Takahashi, Kunihiro Goto, Yasushi Fukazawa, Hiroaki Murakami, Syogo Kobayashi, Soki Sakurai, Makoto Sasano, Shunsuke Torii, Toshio Nakano, Ko Ono, Kazuma Miyake, Terukazu Nishida, Kazuhiro Nakazawa, Kazuo Makishima, Kouichi Hagino, Takayuki Yuasa, Hirokazu Odaka, Rie Sato, Shin Watanabe, Motohide Kokubun, Tadayuki Takahashi, Goro Sato, Jun Kataoka, Tatsuhiko Saito, Kazutaka Yamaoka, Hiroyasu Tajima, Yoichi Yatsu, Takeshi Nakamori, Hideki Uchiyama, Daisuke Yonetoku

    SPACE TELESCOPES AND INSTRUMENTATION 2014: ULTRAVIOLET TO GAMMA RAY   9144  2014年  [査読有り]

    　概要を見る

    The hard X-ray imager (HXI) and soft gamma-ray detector (SGD) onboard Astro-H observe astronomical objects with high sensitivity in the hard X-ray (5-80 keV) and soft gamma-ray (40-600 keV) energy bands. To achieve this high sensitivity, background rejection is essential, and these detectors are surrounded by large and thick bismuth germinate scintillators as an active shield. We have developed adequate trigger logic for both the HXI and SGD to process signals from main detector and BGO shield simultaneously and then we optimized the trigger delay and width, with consideration of the trigger latch efficiency. The shield detector system performs well, even after it is assembled as the HXI sensor. The energy threshold maintains the same level as that observed during the prototype development phase, and the experimental room background level of the main detector is successfully reduced by our optimized trigger timing.

    DOI

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  • Development of the camera for the Large Size Telescopes of the Cherenkov Telescope Array

    Y. Inome, G. Ambrosi, Y. Awane, H. Baba, A. Bamba, M. Barcelo, U. Barres de Almeida, J. A. Barrio, O. Blanch Bigas, J. Boix, L. Brunetti, E. Carmona, E. Chabanne, M. Chikawa, N. Cho, P. Colin, J. L. Conteras, J. Cortina, F. Dazzi, A. Deangelis, G. Deleglise, C. Delgado, C. Diaz, F. Dubois, A. Fiasson, D. Fink, N. Fouque, L. Freixas, C. Fruck, A. Gadola, R. Garcia, D. Gascon, N. Geffroy, N. Giglietto, F. Giordano, F. Granena, S. Gunji, R. Hagiwara, N. Hamer, Y. Hanabata, T. Hassan, K. Hatanaka, T. Haubold, M. Hayashida, R. Hermel, D. Herranz, K. Hirotani, J. Hose, D. Hugh, S. Inoue, Y. Inoue, K. Ioka, C. Jablonski, M. Kagaya, H. Katagiri, J. Kataoka, H. Kellermann, T. Kishimoto, M. Knoetig, K. Kodani, K. Kohri, T. Kojima, Y. Konno, S. Koyama, H. Kubo, J. Kushida, G. Lamanna, T. Le Flour, M. Lopez-Moya, R. Lopez, E. Lorenz, P. Majumdar, A. Manalaysay, M. Mariotti, G. Martinez, M. Martinez, S. Masuda, S. Matsuoka, D. Mazin, U. Menzel, J. M. Miranda, R. Mirzoyan, I. Monteiro, A. Moralejo, K. Murase, S. Nagataki, T. Nagayoshi, D. Nakajima, T. Nakamori, K. Nishijima, K. Noda, A. Nozato, M. Ogino, Y. Ohira, M. Ohishi, H. Ohoka, A. Okumura, S. Ono, R. Orito, J. L. Panazol, D. Paneque, R. Paoletti, J. M. Paredes, G. Pauletta, S. Podkladkin, J. Prast, R. Rando, O. Reimann, M. Ribo, S. Rosier-Lees, K. Saito, T. Saito, Y. Saito, N. Sakaki, R. Sakonaka, A. Sanuy, M. Sawada, V. Scalzotto, S. Schultz, T. Schweizer, T. Shibata, S. Shu, J. Sieiro, V. Stamatescu, S. Steiner, U. Straumann, R. Sugawara, H. Tajima, H. Takami, M. Takahashi, S. Tanaka, M. Tanaka, L. A. Tejedor, Y. Terada, M. Teshima, Y. Tomono, T. Totani, T. Toyama, Y. Tsubone, Y. Tsuchiya, S. Tsujimoto, H. Ueno, K. Umehara, Y. Umetsu, A. Vollhardt, R. Wagner, H. Wetteskind, T. Yamamoto, R. Yamazaki, A. Yoshida, T. Yoshida, T. Yoshikoshi

    ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION   9151   914542 - 8pp  2014年

    　概要を見る

    The Large Size Telescopes, LSTs, located at the center of the Cherenkov Telescope Array, CTA, will be sensitive for low energy gamma-rays. The camera on the LST focal plane is optimized to detect low energy events based on a high photon detection efficiency and high speed electronics. Also the trigger system is designed to detect low energy showers as much as possible. In addition, the camera is required to work stably without maintenance in a few tens of years. In this contribution we present the design of the camera for the first LST and the status of its development and production.

    DOI

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    5
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  • Soft Gamma-ray Detector (SGD) onboard the ASTRO-H

    Fukazawa Yasushi, Tajima Hiroyasu, Watanabe Shin, Blandford Roger, Hayashi Katsuhiro, Harayama Atsushi, Kataoka Jun, Kawaharada Madoka, Kokubun Motohide, Laurent Philippe, Lebrun Francois, Limousin Olivier, Madejski Grzegorz M, Makishima Kazuo, Mizuno Tsunefumi, Mori Kunishiro, Nakamori Takeshi, Nakazawa Kazuhiro, Noda Hirofumi, Odaka Hirokazu, Ohno Masanori, Ohta Masayuki, Saito Shin'ya, Sato Goro, Sato Rie, Takeda Shin'ichiro, Takahashi Hiromitsu, Takahashi Tadayuki, Tanaka Yasuyuki, Terada Yukikatsu, Uchiyama Hideki, Uchiyama Yasunobu, Yamaoka Kazutaka, Yatsu Yoichi, Yonetoku Daisuke, Yuasa Takayuki

    SPACE TELESCOPES AND INSTRUMENTATION 2014: ULTRAVIOLET TO GAMMA RAY   9144  2014年  [査読有り]

    DOI

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    18
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  • The hard X-ray imager (HXI) for the ASTRO-H mission

    Sato G, Kokubun M, Nakazawa K, Enoto T, Fukazawa Y, Harayama A, Hayashi K, Kataoka J, Katsuta J, Kawaharada M, Laurent P, Lebrun F, Limousin O, Makishima K, Mizuno T, Mori K, Nakamori T, Noda H, Odaka H, Ohno M, Ohta M, Saito S, Sato R, Tajima H, Takahashi H, Takahashi T, Takeda S, Terada Y, Uchiyama H, Uchiyama Y, Watanabe S, Yamaoka K, Yatsu Y, Yuasa T

    Proceedings of SPIE - The International Society for Optical Engineering   9144  2014年  [査読有り]

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    23
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  • 大面積MPPC array を用いた放射線検出器の最前線

    片岡 淳

    放射線（応用物理学会・放射線分科会）   39 ( 3 ) 117 - 126  2014年

    CiNii

  • Evaluation of the performance limit of MPPC for ToF-PET

    Takayuki Tsujikawa, Jun Kataoka, Takahiro Ambe, Takuya Fujita, Yota Kurei, Goro Sato, Hirolazu Ikeda

    2014 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC)    2014年  [査読有り]

    　概要を見る

    In recent years, multi-pixel photon counters (MP-PCs) have been actively studied for use in a module for such next-generation PET systems as MRI-PET, DoI-PET, and ToF-PET scanners. In particular, Time of Flight (ToF) measurement is a challenging approach to identify the position of a gamma-ray source, according to differences in the arrival times of annihilation gamma rays after positron decay. Several simulations suggest a substantial improvement in the signal-to-noise ratio of PET images when using ToF information. However, ToF-PET performance is determined by the time resolution of a gamma-ray sensor (including scintillators, photo-sensors and readout electronics) as a whole, thus making it often difficult to achieve ToF resolution as good as 500 ps (FWHM) in actual PET systems. This paper describes our development of a new method of ToF measurement using MPPC-based scintillation detectors. We showed that our method effectively reduces the contamination of dark noise, and minimizes the effects of time walk and timing jitter. The best ToF resolution of 213 ps (FWHM) was achieved by coupling 3x3x10 mm(3) Ce:LYSO crystal with a 3x3 mm(2) pixel detector. We conclude by commenting on our ultra-fast ASIC for 16-ch MPPC readout as pertaining to future applications in MPPC-PET scanners with ToF measurement capability.

    DOI

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  • The first FERMI-LAT catalog of sources above 10 GeV

    M. Ackermann, M. Ajello, A. Allafort, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, A. Belfiore, R. Bellazzini, E. Bernieri, E. Bissaldi, E. D. Bloom, E. Bonamente, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, R. Campana, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, R. C.G. Chaves, A. Chekhtman, C. C. Cheung, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, R. Desiante, S. W. Digel, L. Di Venere, P. S. Drell, A. Drlica-Wagner, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, P. Fortin, A. Franckowiak, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, G. Godfrey, G. A. Gomez-Vargas, I. A. Grenier, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, M. Hayashida, E. Hays, J. Hewitt, A. B. Hill, D. Horan, R. E. Hughes, T. Jogler, G. Jóhannesson, A. S. Johnson, T. J. Johnson, W. N. Johnson, T. Kamae, J. Kataoka, T. Kawano, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, E. Massaro, M. Mayer

    Astrophysical Journal, Supplement Series   209 ( 2 )  2013年12月

    　概要を見る

    We present a catalog of γ-ray sources at energies above 10 GeV based on data from the Large Area Telescope (LAT) accumulated during the first 3 yr of the Fermi Gamma-ray Space Telescope mission. The first Fermi-LAT catalog of >10 GeV sources (1FHL) has 514 sources. For each source we present location, spectrum, a measure of variability, and associations with cataloged sources at other wavelengths. We found that 449 (87%) could be associated with known sources, of which 393 (76% of the 1FHL sources) are active galactic nuclei. Of the 27 sources associated with known pulsars, we find 20 (12) to have significant pulsations in the range >10 GeV (>25 GeV). In this work we also report that, at energies above 10 GeV, unresolved sources account for 27% ± 8% of the isotropic γ-ray background, while the unresolved Galactic population contributes only at the few percent level to the Galactic diffuse background. We also highlight the subset of the 1FHL sources that are best candidates for detection at energies above 50-100 GeV with current and future ground-based γ-ray observatories. © 2013. The American Astronomical Society. All rights reserved..

    DOI

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    200
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  • Handy Compton camera using 3D position-sensitive scintillators coupled with large-area monolithic MPPC arrays

    J. Kataoka, A. Kishimoto, T. Nishiyama, T. Fujita, K. Takeuchi, T. Kato, T. Nakamori, S. Ohsuka, S. Nakamura, M. Hirayanagi, S. Adachi, T. Uchiyama, K. Yamamoto

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   732   403 - 407  2013年12月

    　概要を見る

    The release of radioactive isotopes (mainly Cs-137, Cs-134 and till) from the crippled Fukushima Daiichi Nuclear Plant remains a serious problem in japan. To help identify radiation hotspots and ensure effective decontamination operation, we are developing a novel Compton camera weighting only 1 kg and measuring just similar to 10 cm(2) in size. Despite its compactness, the camera realizes a wide 180 degrees field of vision with a sensitivity about 50 times superior to other cameras being tested in Fukushima. We expect that a hotspot producing a 5 mu Sv/h dose at a distance of 3 m can be imaged every 10 s, with angular resolution better than 10 degrees (FWHM). The 3D position sensitive scintillators and thin monolithic MPPC arrays are the key technologies developed here. By measuring the pulse height ratio of MPPC-arrays coupled at both ends of a Ce:GAGG scintillator block, the depth of interaction (DOI) is obtained for incident gamma rays as well as the usual 2D positions, with accuracy better than 2 mm. By using two identical 10 mm cubic Ce:GAGG scintillators as a scatterer and an absorber, we confirmed that the 3D configuration works well as a high resolution gamma camera, and also works as spectrometer achieving typical energy resolution of 9.8% (FWHM) for 662 keV gamma rays. We present the current status of the prototype camera (weighting 1.5 kg and measuring 8.5 x 14 x 16 cm(3) in size) being fabricated by Hamamatsu Photonics K. K. Although the camera still operates in non-DOI mode, angular resolution as high as 14 degrees (FWHM) was achieved with an integration time of 30s for the assumed hotspot described above. (C) 2013 Elsevier B.V. All tights reserved.

    DOI

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    126
    被引用数
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  • SUZAKU OBSERVATIONS OF THE DIFFUSE X-RAY EMISSION ACROSS THE FERMI BUBBLES' EDGES

    J. Kataoka, M. Tahara, T. Totani, Y. Sofue, L. Stawarz, Y. Takahashi, Y. Takeuchi, H. Tsunemi, M. Kimura, Y. Takei, C. C. Cheung, Y. Inoue, T. Nakamori

    ASTROPHYSICAL JOURNAL   779 ( 1 )  2013年12月

    　概要を見る

    We present Suzaku X-ray observations along two edge regions of the Fermi Bubbles, with eight similar or equal to 20 ks pointings across the northern part of the North Polar Spur (NPS) surrounding the north bubble and six across the southernmost edge of the south bubble. After removing compact X-ray features, diffuse X-ray emission is clearly detected and is well reproduced by a three-component spectral model consisting of unabsorbed thermal emission (temperature kT similar or equal to 0.1 keV) from the Local Bubble, absorbed kT similar or equal to 0.3 keV thermal emission related to the NPS and/or Galactic halo (GH), and a power-law component at a level consistent with the cosmic X-ray background. The emission measure (EM) of the 0.3 keV plasma decreases by similar or equal to 50% toward the inner regions of the northeast bubble, with no accompanying temperature change. However, such a jump in the EM is not clearly seen in the south bubble data. While it is unclear whether the NPS originates from a nearby supernova remnant or is related to previous activity within or around the Galactic center, our Suzaku observations provide evidence that suggests the latter scenario. In the latter framework, the presence of a large amount of neutral matter absorbing the X-ray emission as well as the existence of the kT similar or equal to 0.3 keV gas can be naturally interpreted as a weak shock driven by the bubbles' expansion in the surrounding medium, with velocity v(exp) similar or equal to 300 km s(-1) (corresponding to shock Mach number M similar or equal to 1.5), compressing the GH gas to form the NPS feature. We also derived an upper limit for any non-thermal X-ray emission component associated with the bubbles and demonstrate that, in agreement with the aforementioned findings, the non-thermal pressure and energy estimated from a one-zone leptonic model of its broadband spectrum, are in rough equilibrium with that of the surrounding thermal plasma.

    DOI

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    97
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  • 3次元位置有感型シンチレータと MPPCアレイを用いた携帯型ガンマ線カメラ

    J.Kataoka

    Nuclear Instruments and Method, Section-A   732   403 - 407  2013年12月  [査読有り]

    DOI

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    126
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  • すざく衛星によるフェルミ・バブルからの拡散X線の観測

    J.Kataoka

    The Astrophysical Journal   779 ( 1 ) 57 - 72  2013年12月  [査読有り]

    DOI

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    97
    被引用数
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  • Erratum: Fermi large area telescope study of cosmic-rays and the interstellar medium in nearby molecular clouds (ApJ (2012) 755 (22))

    M. Ackermann, M. Ajello, A. Allafort, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, E. Bottacini, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, G. Busetto, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, L. Falletti, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, Y. Fukazawa, Y. Fukui, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, K. Hayashi, D. Horan, X. Hou, R. E. Hughes, R. Itoh, M. S. Jackson, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, S. H. Lee, M. Lemoine-Goumard, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, P. Martin, M. N. Mazziotta, J. E. McEnery, J. Mehault, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia

    Astrophysical Journal   778 ( 1 )  2013年11月

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    6
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  • The First Fermi-LAT Gamma-Ray Burst Catalog

    Ackermann M, Ajello M, Asano K, Axelsson M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bhat P.~N, Bissaldi E, Bloom E.~D, Bonamente E, Bonnell J, Bouvier A, Brandt T.~J, Bregeon J, Brigida M, Bruel P, Buehler R, Burgess J.~M, Buson S, Byrne D, Caliandro G.~A, Cameron R.~A, Caraveo P.~A, Cecchi C, Charles E, Chaves R.~C.~G, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Connaughton V, Conrad J, Cutini S, D'Ammando F, de Angelis A, de Palma F, Dermer C.~D, Desiante R, Digel S.~W, Dingus B.~L, Di Venere L, Drell P.~S, Drlica-Wagner A, Dubois R, Favuzzi C, Ferrara E.~C, Fitzpatrick G, Foley S, Franckowiak A, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Goldstein A, Granot J, Grenier I.~A, Grove J.~E, Gruber D, Guiriec S, Hadasch D, Hanabata Y, Hayashida M, Horan D, Hou X, Hughes R.~E, Inoue Y, Jackson M.~S, Jogler T, J{\'o}hannesson G, Johnson A.~S, Johnson W.~N, Kamae T, Kataoka J, Kawano T, Kippen R.~M, Kn{\"o}dlseder J, Kocevski D, Kouveliotou C, Kuss M, Lande J, Larsson S, Latronico L, Lee S.-H, Longo F, Loparco F, Lovellette M.~N, Lubrano P, Massaro F, Mayer M, Mazziotta M.~N, McBreen S, McEnery J.~E, McGlynn S, Michelson P.~F, Mizuno T, Moiseev A.~A, Monte C, Monzani M.~E, Moretti E, Morselli A, Murgia S, Nemmen R, Nuss E, Nymark T, Ohno M, Ohsugi T, Omodei N, Orienti M, Orlando E, Paciesas W.~S, Paneque D, Panetta J.~H, Pelassa V, Perkins J.~S, Pesce-Rollins M, Piron F, Pivato G, Porter T.~A, Preece R, Racusin J.~L, Rain{\`o} S, Rando R, Rau A, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Ritz S, Romoli C, Roth M, Ryde F, Saz Parkinson P.~M, Schalk T.~L, Sgr{\`o} C, Siskind E.~J, Sonbas E, Spandre G, Spinelli P, Suson D.~J, Tajima H, Takahashi H, Takeuchi Y, Tanaka Y, Thayer J.~G, Thayer J.~B, Thompson D.~J, Tibaldo L, Tierney D, Tinivella M, Torres D.~F, Tosti G, Troja E, Tronconi V, Usher T.~L, Vandenbroucke J, van der Horst A.~J, Vasileiou V, Vianello G, Vitale V, von Kienlin A, Winer B.~L, Wood K.~S, Wood M, Xiong S, Yang Z

    The Astrophysical Journal Supplement   209 ( 1 ) 11  2013年11月  [査読有り]

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  • THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS

    A. A. Abdo, M. Ajello, A. Allafort, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, A. Belfiore, R. Bellazzini, B. Bhattacharyya, E. Bissaldi, E. D. Bloom, E. Bonamente, E. Bottacini, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, M. Burgay, T. H. Burnett, G. Busetto, S. Buson, G. A. Caliandro, R. A. Cameron, F. Camilo, P. A. Caraveo, J. M. Casandjian, C. Cecchi, Oe . Celik, E. Charles, S. Chaty, R. C. G. Chaves, A. Chekhtman, A. W. Chen, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, I. Cognard, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, M. E. DeCesar, A. De Luca, P. R. Den Hartog, F. De Palma, C. D. Dermer, G. Desvignes, S. W. Digel, L. Di Venere, P. S. Drell, A. Drlica-Wagner, R. Dubois, D. Dumora, C. M. Espinoza, L. Falletti, C. Favuzzi, E. C. Ferrara, W. B. Focke, A. Franckowiak, P. C. C. Freire, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, E. V. Gotthelf, I. A. Grenier, M. -H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, M. Hayashida, E. Hays, J. Hessels, J. Hewitt, A. B. Hill, D. Horan, X. Hou, R. E. Hughes, M. S. Jackson, G. H. Janssen, T. Jogler, G. Johannesson, R. P. Johnson, A. S. Johnson, T. J. Johnson, W. N. Johnson, S. Johnston, T. Kamae, J. Kataoka, M. Keith, M. Kerr, J. Knoedlseder, M. Kramer, M. Kuss, J. Lande, S. Larsson, L. Latronico, M. Lemoine-Goumard, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, A. G. Lyne, R. N. Manchester, M. Marelli, F. Massaro, M. Mayer, M. N. Mazziotta, J. E. McEnery, M. A. McLaughlin, J. Mehault, P. F. Michelson, R. P. Mignani, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, R. Nemmen, E. Nuss, M. Ohno, T. Ohsugi, M. Orienti, E. Orlando, J. F. Ormes, D. Paneque, J. H. Panetta, D. Parent, J. S. Perkins, M. Pesce-Rollins, M. Pierbattista, F. Piron, G. Pivato, H. J. Pletsch, T. A. Porter, A. Possenti, S. Raino, R. Rando, S. M. Ransom, P. S. Ray, M. Razzano, N. Rea, A. Reimer, O. Reimer, N. Renault, T. Reposeur, S. Ritz, R. W. Romani, M. Roth, R. Rousseau, J. Roy, J. Ruan, A. Sartori, P. M. Saz Parkinson, J. D. Scargle, A. Schulz, C. Sgro, R. Shannon, E. J. Siskind, D. A. Smith, G. Spandre, P. Spinelli, B. W. Stappers, A. W. Strong, D. J. Suson, H. Takahashi, J. G. Thayer, J. B. Thayer, G. Theureau, D. J. Thompson, S. E. Thorsett, L. Tibaldo, O. Tibolla, M. Tinivella, D. F. Torres, G. Tosti, E. Troja, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou, C. Venter, G. Vianello, V. Vitale, N. Wang, P. Weltevrede, B. L. Winer, M. T. Wolff, D. L. Wood, K. S. Wood, M. Wood, Z. Yang

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   208 ( 2 ) 17  2013年10月  [査読有り]

    　概要を見る

    This catalog summarizes 117 high-confidence &gt;= 0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on the Fermi satellite. Half are neutron stars discovered using LAT data through periodicity searches in gamma-ray and radio data around LAT unassociated source positions. The 117 pulsars are evenly divided into three groups: millisecond pulsars, young radio-loud pulsars, and young radio-quiet pulsars. We characterize the pulse profiles and energy spectra and derive luminosities when distance information exists. Spectral analysis of the off-peak phase intervals indicates probable pulsar wind nebula emission for four pulsars, and off-peak magnetospheric emission for several young and millisecond pulsars. We compare the gamma-ray properties with those in the radio, optical, and X-ray bands. We provide flux limits for pulsars with no observed gamma-ray emission, highlighting a small number of gamma-faint, radio-loud pulsars. The large, varied gamma-ray pulsar sample constrains emission models. Fermi's selection biases complement those of radio surveys, enhancing comparisons with predicted population distributions.

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  • MULTIBAND DIAGNOSTICS OF UNIDENTIFIED 1FGL SOURCES WITH SUZAKU AND SWIFT X-RAY OBSERVATIONS

    Y. Takeuchi, J. Kataoka, K. Maeda, Y. Takahashi, T. Nakamori, M. Tahara

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   208 ( 2 ) 25 - 57  2013年10月  [査読有り]

    　概要を見る

    We have analyzed all the archival X-ray data of 134 unidentified (unID) gamma-ray sources listed in the first Fermi/LAT (1FGL) catalog and subsequently followed up by the Swift/XRT. We constructed the spectral energy distributions (SEDs) from radio to gamma-rays for each X-ray source detected, and tried to pick up unique objects that display anomalous spectral signatures. In these analyses, we target all the 1FGL unID sources, using updated data from the second Fermi/LAT (2FGL) catalog on the Large Area Telescope (LAT) position and spectra. We found several potentially interesting objects, particularly three sources, 1FGL J0022.2-1850, 1FGL J0038.0+1236, and 1FGL J0157.0-5259, which were then more deeply observed with Suzaku as a part of an AO-7 program in 2012. We successfully detected an X-ray counterpart for each source whose X-ray spectra were well fitted by a single power-law function. The positional coincidence with a bright radio counterpart (currently identified as an active galactic nucleus, AGN) in the 2FGL error circles suggests these sources are definitely the X-ray emission from the same AGN, but their SEDs show a wide variety of behavior. In particular, the SED of 1FGL J0038.0+1236 is not easily explained by conventional emission models of blazars. The source 1FGL J0022.2-1850 may be in a transition state between a low-frequency peaked and a high-frequency peaked BL Lac object, and 1FGL J0157.0-5259 could be a rare kind of extreme blazar. We discuss the possible nature of these three sources observed with Suzaku, together with the X-ray identification results and SEDs of all 134 sources observed with the Swift/XRT.

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    29
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  • 高感度かつ携帯可能なガンマ線カメラの開発

    片岡 淳, 西山 徹, 藤田 卓也, 武内 健士郎, 呉井 洋太, 岸本 彩, 大須賀 慎二, 中村 重幸, 平柳 通人, 足立 俊介, 内山 徹也, 加藤 卓也, 鈴木 裕樹

    電気学会研究会資料. NE, 原子力研究会   2013 ( 1 ) 1 - 6  2013年09月

    CiNii

  • CONSTRAINTS ON THE COSMIC-RAY DENSITY GRADIENT BEYOND THE SOLAR CIRCLE FROM FERMI gamma-RAY OBSERVATIONS OF THE THIRD GALACTIC QUADRANT (vol 726, pg 81, 2011)

    Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom E. D, Bonamente E, Borgla, A. W, Brandt T. J, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dermer C. D, de Palma F, Digel S. W, Drell P. S, Dubois R, Favuzzi C, Ferrara E. C, Focke W. B, Fukazawa Y, Funk S, Fusco P, Gargano F, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashi K, Hayashida M, Hughes R. E, Itoh R, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Llena-Garde M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makeev A, Martin P, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nishino S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ripken J, Sada T, Sadrozinski H. F. -W, Sgro C, Siskind E. J, Spandre G, Spinelli P, Strickman M. S, Strong A. W, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thompson D. J, Tibaldo L, Torres D. F, Tramacere A, Uchiyama Y, Uehara T, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, Vladimirov A. E, Waite A. P, Wang P, Wood K. S, Yang Z, Ziegler M

    ASTROPHYSICAL JOURNAL   772 ( 2 )  2013年08月  [査読有り]

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    2
    被引用数
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  • X-RAY AND RADIO FOLLOW-UP OBSERVATIONS OF HIGH-REDSHIFT BLAZAR CANDIDATES IN THE FERMI-LAT UNASSOCIATED SOURCE POPULATION

    Y. Takahashi, J. Kataoka, K. Niinuma, M. Honma, Y. Inoue, T. Totani, S. Inoue, T. Nakamori, K. Maeda

    ASTROPHYSICAL JOURNAL   773 ( 1 ) 36 - 46  2013年08月  [査読有り]

    　概要を見る

    We report on the results of X-ray and radio follow-up observations of two GeV gamma-ray sources 2FGL J0923.5+1508 and 2FGL J1502.1+5548, selected as candidates for high-redshift blazars from unassociated sources in the Fermi Large Area Telescope Second Source Catalog. We utilize the Suzaku satellite and the VLBI Exploration of Radio Astrometry (VERA) telescopes for X-ray and radio observations, respectively. For 2FGL J0923.5+1508, a possible radio counterpart NVSS J092357+150518 is found at 1.4 GHz from an existing catalog, but we do not detect any X-ray emission from it and derive a flux upper limit F2-8 (keV) &lt; 1.37 x 10(-14) erg cm(-2) s(-1). Radio observations at 6.7 GHz also result in an upper limit of S-6.7 (GHz) &lt; 19 mJy, implying a steep radio spectrum that is not expected for a blazar. On the other hand, we detect X-rays from NVSS J150229+555204, the potential 1.4 GHz radio counterpart of 2FGL J1502.1+5548. The X-ray spectrum can be fitted with an absorbed power-law model with a photon index gamma = 1.8(-0.2)(+0.3) and the unabsorbed flux is F2-8 (keV) = 4.3(-1.0)(+1.1) x 10(-14) erg cm(-2) s(-1). Moreover, we detect unresolved radio emission at 6.7 GHz with flux S-6.7 (GHz) = 30.1 mJy, indicating a compact, flat-spectrum radio source. If NVSS J150229+555204 is indeed associated with 2FGL J1502.1+5548, then we find that its multiwavelength spectrum is consistent with a blazar at redshift z similar to 3-4.

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    4
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  • Development of Radiation-hardened Multi Pixel Photon Counters

    Nakamori, T, Kurei, Y, Takeuchi, K, Saito, T, Kataoka, J, Fujita, T, Kato, T, Sato, K, Yamada, R, Kawabata, N, Kokubun, M

    Proceedings of 33rd International Cosmic Ray Conference   2013-October  2013年07月

  • The Fermi all-sky variability analysis: A list of flaring gamma-ray sources and the search for transients in our galaxy

    M. Ackermann, M. Ajello, A. Albert, A. Allafort, E. Antolini, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, R. D. Blandford, E. D. Bloom, E. Bonamente, E. Bottacini, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, G. Chiaro, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, M. Dalton, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, L. Di Venere, P. S. Drell, A. Drlica-Wagner, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, M. Hayashida, E. Hays, J. Hewitt, A. B. Hill, D. Horan, X. Hou, R. E. Hughes, Y. Inoue, M. S. Jackson, T. Jogler, G. Jóhannesson, W. N. Johnson, T. Kamae, J. Kataoka, T. Kawano, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno

    Astrophysical Journal   771 ( 1 )  2013年07月

    　概要を見る

    In this paper, we present the Fermi All-sky Variability Analysis (FAVA), a tool to systematically study the variability of the gamma-ray sky measured by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. For each direction on the sky, FAVA compares the number of gamma-rays observed in a given time window to the number of gamma-rays expected for the average emission detected from that direction. This method is used in weekly time intervals to derive a list of 215 flaring gamma-ray sources. We proceed to discuss the 27 sources found at Galactic latitudes smaller than 10° and show that, despite their low latitudes, most of them are likely of extragalactic origin. © 2013. The American Astronomical Society. All rights reserved.

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  • High resolution phoswich gamma-ray imager utilizing monolithic MPPC arrays with submillimeter pixelized crystals

    T. Kato, J. Kataoka, T. Nakamori, A. Kishimoto, S. Yamamoto, K. Sato, Y. Ishikawa, K. Yamamura, N. Kawabata, H. Ikeda, K. Kamada

    JOURNAL OF INSTRUMENTATION   8 ( 5 ) P05022  2013年05月  [査読有り]

    　概要を見る

    We report the development of a high spatial resolution tweezers-type coincidence gamma-ray camera for medical imaging. This application consists of large-area monolithic Multi-Pixel Photon Counters (MPPCs) and submillimeter pixelized scintillator matrices. The MPPC array has 4x4 channels with a three-side buttable, very compact package. For typical operational gain of 7.5x10(5) at + 20 degrees C, gain fluctuation over the entire MPPC device is only +/- 5.6%, and dark count rates (as measured at the 1 p.e. level) amount to &lt;= 400 kcps per channel. We selected Ce-doped (Lu, Y)(2)(SiO4)O (Ce:LYSO) and a brand-new scintillator, Ce-doped Gd3Al2Ga3O12 (Ce:GAGG) due to their high light yield and density. To improve the spatial resolution, these scintillators were fabricated into 15x15 matrices of 0.5x0.5 mm(2) pixels. The Ce: LYSO and Ce: GAGG scintillator matrices were assembled into phosphor sandwich (phoswich) detectors, and then coupled to the MPPC array along with an acrylic light guide measuring 1 mm thick, and with summing operational amplifiers that compile the signals into four position-encoded analog outputs being used for signal readout. Spatial resolution of 1.1 mm was achieved with the coincidence imaging system using a Na-22 point source. These results suggest that the gamma-ray imagers offer excellent potential for applications in high spatial medical imaging.

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    6
    被引用数
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  • GIANT LOBES OF CENTAURUS A RADIO GALAXY OBSERVED WITH THE SUZAKU X-RAY SATELLITE

    Stawarz, L, Tanaka, Y. T, Madejski, G, O'Sullivan, S. P, Cheung, C. C, Feain, I. J, Fukazawa, Y, Gandhi, P, Hardcastle, M. J, Kataoka, J

    ASTROPHYSICAL JOURNAL   766 ( 1 )  2013年03月  [査読有り]

    　概要を見る

    We report on Suzaku observations of selected regions within the southern giant lobe of the radio galaxy Centaurus A. In our analysis we focus on distinct X-ray features detected with the X-ray Imaging Spectrometer within the range 0.5-10 keV, some of which are likely associated with fine structure of the lobe revealed by recent high-quality radio intensity and polarization maps. With the available photon statistics, we find that the spectral properties of the detected X-ray features are equally consistent with thermal emission from hot gas with temperatures kT &gt; 1 keV, or with a power-law radiation continuum characterized by photon indices Gamma similar to 2.0 +/- 0.5. However, the plasma parameters implied by these different models favor a synchrotron origin for the analyzed X-ray spots, indicating that a very efficient acceleration of electrons up to greater than or similar to 10 TeV energies is taking place within the giant structure of Centaurus A, albeit only in isolated and compact regions associated with extended and highly polarized radio filaments. We also present a detailed analysis of the diffuse X-ray emission filling the whole field of view of the instrument, resulting

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    33
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  • Introducing the CTA concept

    Acharya, B. S., Actis, M., Aghajani, T., Agnetta, G., Aguilar, J., Aharonian, F., Ajello, M., Akhperjanian, A., Alcubierre, M., Aleksić, J., Alfaro, R., Aliu, E., Allafort, A. J., Allan, D., Allekotte, I., Amato, E., Anderson, J., Angüner, E. O., Antonelli, L. A., Antoranz, P. Aravantinos, A., Arlen, T., Armstrong, T., Arnaldi, H., Arrabito, L., Asano, K., Ashton, T., Asorey, H. G., Awane, Y., Baba, H., Babic, A., Baby, N., Bähr, J., Bais, A., Baixeras, C., Bajtlik, S., Balbo, M., Balis, D., Balkowski, C., Bamba, A., Bandiera, R., Barber, A., Barbier, C., Barceló, M., Barnacka, A., Barnstedt, J., Barres de Almeida, U., Barrio, J. A., Basili, A., Basso, S., Bastieri, D., Bauer, C., Baushev, A., Becerra, J., Becherini, Y., Bechtol, K. C., Becker Tjus, J., Beckmann, V., Bednarek, W., Behera, B., Belluso, M., Benbow, W., Berdugo, J., Berger, K., Bernard, F., Bernardino, T., Bernlöhr, K., Bhat, N., Bhattacharyya, S., Bigongiari, C., Biland, A., Billotta, S., Bird, T., Birsin, E., Bissaldi, E., Biteau, J., Bitossi, M., Blake, S., Blanch Bigas, O., Blasi, P., Bobkov, A., Boccone, V., Boettcher, M., Bogacz, L., Bogart, J., Bogdan, M., Boisson, C., Boix Gargallo, J., Bolmont, J., Bonanno, G., Bonardi, A., Bonev, T., Bonifacio, P., Bonnoli, G., Bordas, P., Borgland, A., Borkowski, J., Bose, R., Botner, O., Bottani, A., Bouchet, L., Bourgeat, M., Boutonnet, C., Bouvier, A., Brau-Nogué, S., Braun, I., Bretz, T., Briggs, M., Bringmann, T., Brook, P., Brun, P., Brunetti, L., Buanes, T., Buckley, J., Buehler, R., Bugaev, V., Bulgarelli, A., Bulik, T., Busetto, G., Buson, S., Byrum, K., Cailles, M., Cameron, R., Camprecios, J., Canestrari, R., Cantu, S., Capalbi, M., Caraveo, P., Carmona, E., Carosi, A., Carr, J., Carton, P. -H., Casanova, S., Casiraghi, M., Catalano, O., Cavazzani, S., Cazaux, S., Cerruti, M., Chabanne, E., Chadwick, P., Champion, C., Chen, A., Chiang, J., Chiappetti, L., Chikawa, M., Chitnis, V. R., Chollet, F., Chudoba, J., Cieślar, M., Cillis, A., Cohen-Tanugi, J., Colafrancesco, S., Colin, P., Colome, J., Colonges, S., Compin, M., Conconi, P., Conforti, V., Connaughton, V., Conrad, J., Contreras, J. L., Coppi, P., Corona, P., Corti, D., Cortina, J., Cossio, L., Costantini, H., Cotter, G., Courty, B., Couturier, S., Covino, S., Crimi, G., Criswell, S. J., Croston, J., Cusumano, G., Dafonseca, M., Dale, O., Daniel, M., Darling, J., Davids, I., Dazzi, F., De Angelis, A., De Caprio, V., De Frondat, F., de Gouveia Dal Pino, E. M., de la Calle, I., De La Vega, G. A., de los Reyes Lopez, R., De Lotto, B., De Luca, A., de Mello Neto, J. R. T., de Naurois, M., de Oliveira, Y., de Oña Wilhelmi, E., de Souza, V., Decerprit, G., Decock, G., Deil, C., Delagnes, E., Deleglise, G., Delgado, C., Della Volpe, D., Demange, P., Depaola, G., Dettlaff, A., Di Paola, A., Di Pierro, F., Díaz, C., Dick, J., Dickherber, R., Dickinson, H., Diez-Blanco, V., Digel, S., Dimitrov, D., Disset, G., Djannati-Ataï, A., Doert, M., Dohmke, M., Domainko, W., Dominis Prester, D., Donat, A., Dorner, D., Doro, M., Dournaux, J. -L., Drake, G., Dravins, D., Drury, L., Dubois, F., Dubois, R., Dubus, G., Dufour, C., Dumas, D., Dumm, J., Durand, D., Dyks, J., Dyrda, M., Ebr, J., Edy, E., Egberts, K., Eger, P., Einecke, S., Eleftheriadis, C., Elles, S., Emmanoulopoulos, D., Engelhaupt, D., Enomoto, R., Ernenwein, J. -P., Errando, M., Etchegoyen, A., Evans, P., Falcone, A., Fantinel, D., Farakos, K., Farnier, C., Fasola, G., Favill, B., Fede, E., Federici, S., Fegan, S., Feinstein, F., Ferenc, D., Ferrando, P., Fesquet, M., Fiasson, A., Fillin-Martino, E., Fink, D., Finley, C., Finley, J. P., Fiorini, M., Firpo Curcoll, R., Flores, H., Florin, D., Focke, W., Föhr, C., Fokitis, E., Font, L., Fontaine, G., Fornasa, M., Förster, A., Fortson, L., Fouque, N., Franckowiak, A., Fransson, C., Fraser, G., Frei, R., Albuquerque, I. F. M., Fresnillo, L., Fruck, C., Fujita, Y., Fukazawa, Y., Fukui, Y., Funk, S., Gäbele, W., Gabici, S., Gabriele, R., Gadola, A., Galante, N., Gall, D., Gallant, Y., Gámez-García, J., García, B., Garcia López, R., Gardiol, D., Garrido, D., Garrido, L., Gascon, D., Gaug, M., Gaweda, J., Gebremedhin, L., Geffroy, N., Gerard, L., Ghedina, A., Ghigo, M., Giannakaki, E., Gianotti, F., Giarrusso, S., Giavitto, G., Giebels, B., Gika, V., Giommi, P., Girard, N., Giro, E., Giuliani, A., Glanzman, T., Glicenstein, J. -F., Godinovic, N., Golev, V., Gomez Berisso, M., Gómez-Ortega, J., Gonzalez, M. M., González, A., González, F., González Muñoz, A., Gothe, K. S., Gougerot, M., Graciani, R., Grandi, P., Grañena, F., Granot, J., Grasseau, G., Gredig, R., Green, A., Greenshaw, T., Grégoire, T., Grimm, O., Grube, J., Grudzinska, M., Gruev, V., Grünewald, S., Grygorczuk, J., Guarino, V., Gunji, S., Gyuk, G., Hadasch, D., Hagiwara, R., Hahn, J., Hakansson, N., Hallgren, A., Hamer Heras, N., Hara, S., Hardcastle, M. J., Harris, J., Hassan, T., Hatanaka, K., Haubold, T., Haupt, A., Hayakawa, T., Hayashida, M., Heller, R., Henault, F., Henri, G., Hermann, G., Hermel, R., Herrero, A., Hidaka, N., Hinton, J., Hoffmann, D., Hofmann, W., Hofverberg, P., Holder, J., Horns, D., Horville, D., Houles, J., Hrabovsky, M., Hrupec, D., Huan, H., Huber, B., Huet, J. -M., Hughes, G., Humensky, T. B., Huovelin, J., Ibarra, A., Illa, J. M., Impiombato, D., Incorvaia, S., Inoue, S., Inoue, Y., Ioka, K., Ismailova, E., Jablonski, C., Jacholkowska, A., Jamrozy, M., Janiak, M., Jean, P., Jeanney, C., Jimenez, J. 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M., Mirzoyan, R., Mizuno, T., Moal, B., Moderski, R., Mognet, I., Molinari, E., Molinaro, M., Montaruli, T., Monteiro, I., Moore, P., Moralejo Olaizola, A., Mordalska, M., Morello, C., Mori, K., Mottez, F., Moudden, Y., Moulin, E., Mrusek, I., Mukherjee, R., Munar-Adrover, P., Muraishi, H., Murase, K., Murphy, A., Nagataki, S., Naito, T., Nakajima, D., Nakamori, T., Nakayama, K., Naumann, C., Naumann, D., Naumann-Godo, M., Nayman, P., Nedbal, D., Neise, D., Nellen, L., Neustroev, V., Neyroud, N., Nicastro, L., Nicolau-Kukliński, J., Niedźwiecki, A., Niemiec, J., Nieto, D., Nikolaidis, A., Nishijima, K., Nolan, S., Northrop, R., Nosek, D., Nowak, N., Nozato, A., O'Brien, P., Ohira, Y., Ohishi, M., Ohm, S., Ohoka, H., Okuda, T., Okumura, A., Olive, J. -F., Ong, R. A., Orito, R., Orr, M., Osborne, J., Ostrowski, M., Otero, L. A., Otte, N., Ovcharov, E., Oya, I., Ozieblo, A., Padilla, L., Paiano, S., Paillot, D., Paizis, A., Palanque, S., Palatka, M., Pallota, J., Panagiotidis, K., Panazol, J. -L., Paneque, D., Panter, M., Paoletti, R., Papayannis, A., Papyan, G., Paredes, J. M., Pareschi, G., Parks, G., Parraud, J. -M., Parsons, D., Paz Arribas, M., Pech, M., Pedaletti, G., Pelassa, V., Pelat, D., Perez, M. d. C., Persic, M., Petrucci, P. -O., Peyaud, B., Pichel, A., Pita, S., Pizzolato, F., Platos, Ł., Platzer, R., Pogosyan, L., Pohl, M., Pojmanski, G., Ponz, J. D., Potter, W., Poutanen, J., Prandini, E., Prast, J., Preece, R., Profeti, F., Prokoph, H., Prouza, M., Proyetti, M., Puerto-Gimenez, I., Pühlhofer, G., Puljak, I., Punch, M., Pyzioł, R., Quel, E. J., Quinn, J., Quirrenbach, A., Racero, E., Rajda, P. J., Ramon, P., Rando, R., Rannot, R. C., Rataj, M., Raue, M., Reardon, P., Reimann, O., Reimer, A., Reimer, O., Reitberger, K., Renaud, M., Renner, S., Reville, B., Rhode, W., Ribó, M., Ribordy, M., Richer, M. G., Rico, J., Ridky, J., Rieger, F., Ringegni, P., Ripken, J., Ristori, P. R., Riviére, A., Rivoire, S., Rob, L., Roeser, U., Rohlfs, R., Rojas, G., Romano, P., Romaszkan, W., Romero, G. E., Rosen, S., Rosier Lees, S., Ross, D., Rouaix, G., Rousselle, J., Rousselle, S., Rovero, A. C., Roy, F., Royer, S., Rudak, B., Rulten, C., Rupiński, M., Russo, F., Ryde, F., Sacco, B., Saemann, E. O., Saggion, A., Sahakian, V., Saito, K., Saito, T., Saito, Y., Sakaki, N., Sakonaka, R., Salini, A., Sanchez, F., Sanchez-Conde, M., Sandoval, A., Sandaker, H., Sant'Ambrogio, E., Santangelo, A., Santos, E. M., Sanuy, A., Sapozhnikov, L., Sarkar, S., Sartore, N., Sasaki, H., Satalecka, K., Sawada, M., Scalzotto, V., Scapin, V., Scarcioffolo, M., Schafer, J., Schanz, T., Schlenstedt, S., Schlickeiser, R., Schmidt, T., Schmoll, J., Schovanek, P., Schroedter, M., Schultz, C., Schultze, J., Schulz, A., Schure, K., Schwab, T., Schwanke, U., Schwarz, J., Schwarzburg, S., Schweizer, T., Schwemmer, S., Segreto, A., Seiradakis, J. -H., Sembroski, G. H., Seweryn, K., Sharma, M., Shayduk, M., Shellard, R. C., Shi, J., Shibata, T., Shibuya, A., Shum, E., Sidoli, L., Sidz, M., Sieiro, J., Sikora, M., Silk, J., Sillanpää, A., Singh, B. 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J., Tokanai, F., Tokarz, M., Toma, K., Torii, K., Tornikoski, M., Torres, D. F., Torres, M., Tosti, G., Totani, T., Toussenel, F., Tovmassian, G., Travnicek, P., Trifoglio, M., Troyano, I., Tsinganos, K., Ueno, H., Umehara, K., Upadhya, S. S., Usher, T., Uslenghi, M., Valdes-Galicia, J. F., Vallania, P., Vallejo, G., van Driel, W., van Eldik, C., Vandenbrouke, J., Vanderwalt, J., Vankov, H., Vasileiadis, G., Vassiliev, V., Veberic, D., Vegas, I., Vercellone, S., Vergani, S., Veyssiére, C., Vialle, J. P., Viana, A., Videla, M., Vincent, P., Vincent, S., Vink, J., Vlahakis, N., Vlahos, L., Vogler, P., Vollhardt, A., von Gunten, H. -P., Vorobiov, S., Vuerli, C., Waegebaert, V., Wagner, R., Wagner, R. G., Wagner, S., Wakely, S. P., Walter, R., Walther, T., Warda, K., Warwick, R., Wawer, P., Wawrzaszek, R., Webb, N., Wegner, P., Weinstein, A., Weitzel, Q., Welsing, R., Werner, M., Wetteskind, H., White, R., Wierzcholska, A., Wiesand, S., Wilkinson, M., Williams, D. A., Willingale, R., Winiarski, K., Wischnewski, R., Wiśniewski, Ł., Wood, M., Wörnlein, A., Xiong, Q., Yadav, K. K., Yamamoto, H., Yamamoto, T., Yamazaki, R., Yanagita, S., Yebras, J. M., Yelos, D., Yoshida, A., Yoshida, T., Yoshikoshi, T., Zabalza, V., Zacharias, M., Zajczyk, A., Zanin, R., Zdziarski, A., Zech, A., Zhao, A., Zhou, X., Ziętara, K., Ziolkowski, J., Ziółkowski, P., Zitelli, V., Zurbach, C., Żychowski, P., CTA Consortium

    Astroparticle Physics   43   3 - 18  2013年03月  [査読有り]

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    633
    被引用数
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  • DETERMINATION OF THE POINT-SPREAD FUNCTION FOR THE FERMI LARGE AREA TELESCOPE FROM ON-ORBIT DATA AND LIMITS ON PAIR HALOS OF ACTIVE GALACTIC NUCLEI

    Ackermann M, Ajello M, Allafort A, Asano K, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bloom E. D, Bonamente E, Borgland A. W, Bottacini E, Brandt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Burnett T. H, Busetto G, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chaty S, Chekhtman A, Cheung C. C, Chiang J, Cillis A. N, Ciprini S, Claus R, Cohen-Tanugi J, Colafrancesco S, Conrad J, Cutini S, D'Ammando F, de Palma F, Dermer C. D, do Couto e, Silva E, Drell S, Drlica-Wagner A, Dubois R, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grandi P, Grenier I. A, Grove J. E, Guiriec S, Hadasch D, Hayashida M, Hays E, Horan D, Hou X, Hughes R. E, Jackson M. S, Jogler T, Johannesson G, Johnson R. P, Johnson A. S, Kamae T, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lavalley C, Lee S. -H, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Mazziotta M. N, McConville W, McEnery J. E, Mehault J, Michelson P. F, Mignani R. P, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nemmen R, Nishino S, Norris J. P, Nuss E, Ohsugi T, Omodei N, Orienti M, Orlando E, Ormes J. F, Paneque D, Panetta J. H, Pelassa V, Perkins J. S, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Poon H, Porter T. A, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reyes L. C, Ritz S, Rochester L. S, Romoli C, Roth M, Sanchez D. A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Siskind E. J, Snyder A, Spandre G, Spinelli P, Stephens T. E, Suson D. J, Tajima H, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tibolla O, Tinivella M, Tosti G, Troja E, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, von Kienlin A, Waite A. P, Wallace E, Weltevrede P, Winer B. L, Wood K. S, Wood M, Yang Z, Zimmer S

    ASTROPHYSICAL JOURNAL   765 ( 1 )  2013年03月  [査読有り]

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    67
    被引用数
    (Scopus)

  • フェルミの発見した珍種 : 電波で暗いミリ秒パルサー

    谷津 陽一, 河合 誠之, 片岡 淳, 高橋 洋輔

    天文月報   106 ( 4 ) 254 - 262  2013年03月

    CiNii

  • Detection of the Characteristic Pion-Decay Signature in Supernova Remnants

    Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bottacini E, Brandt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Busetto G, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Celik O, Charles E, Chaty S, Chaves R. C. G, Chekhtman A, Cheung C. C, Chiang J, Chiaro G, Cillis A. N, Ciprini S, Claus R, Cohen-Tanugi J, Cominsky L. R, Conrad J, Corbel S, Cutini S, D'Ammando F, de Angelis A, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Falletti L, Favuzzi C, Ferrara E. C, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hayashi K, Hays E, Hewitt J. W, Hill A. B, Hughes R. E, Jackson M. S, Jogler T, Johannesson G, Johnson A. S, Kamae T, Kataoka J, Katsuta J, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Madejski G. M, Massaro F, Mayer M, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mignani R. P, Mitthumsiri W, Mizuno T, Moiseev A. A, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nemmen R, Nuss E, Ohno M, Ohsugi T, Omodei N, Orienti M, Orlando E, Ormes J. F, Paneque D, Perkins J. S, Pesce-Rollins M, Piron F, Pivato G, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Ritz S, Romoli C, Sanchez-Conde M, Schulz A, Sgro C, Simeon P. E, Siskind E. J, Smith D. A, Spandre G, Spinelli P, Stecker F. W, Strong A. W, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Thorsett S. E, Tibaldo L, Tibolla O, Tinivella M, Troja E, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Werner M, Winer B. L, Wood K. S, Wood M, Yamazaki R, Yang Z, Zimmer S

    SCIENCE   339 ( 6121 ) 807 - 811  2013年02月  [査読有り]

    DOI

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    677
    被引用数
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  • Development of ultra-fast ASIC for future PET scanners using TOF-capable MPPC detectors

    H. Matsuda, J. Kataoka, H. Ikeda, T. Kato, T. Anbe, S. Nakamura, Y. Ishikawa, K. Sato, K. Yamamura

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   699   211 - 215  2013年01月  [査読有り]

    　概要を見る

    We have developed a front-end ASIC (MPPC32) intended for future PET scanners that offers time-of-flight (TOF) capability in conjunction with a multi-pixel photon counter (MPPC) array. The ASIC design is based on the open-IP project proposed by JAXA and was realized in TSMC 0.35-μm CMOS technology. The circuit comprises 32-channel, low impedance CMOS current conveyors (CCs) to effectively acquire fast MPPC signals. In order to precisely measure the coincidence timing of 511 keV gamma rays, the leading-edge method was employed instead of conventional zero-crossing measurement to discriminate signals. As a result, we obtained time jitter and walk measurement of 67 ps (FWHM) and 98 ps (within 511 keV±20%), respectively. Moreover, excellent energy resolutions of 9.8% (662 keV
    FWHM) and 10.5% (511 keV
    FWHM) were obtained by utilizing a 3×3 mm2 MPPC (of 50μm pitch) coupled with a Ce-doped LYSO (Ce:LYSO) crystal 3×3×10 mm3 in size. We finally report on the TOF measurements, and demonstrate that the MPPC32 developed here can be a promising device for future TOF-PET scanners using the MPPC array. © 2012 Elsevier B.V.

    DOI

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    13
    被引用数
    (Scopus)

  • 20pSR-3 CTA報告58 : 全体報告(高エネルギーガンマ線(CTA,MAGIC),宇宙線・宇宙物理領域)

    手嶋 政廣, 窪 秀利, 戸谷 友則, 浅野 勝晃, 井岡 邦仁, 井川 大地, 石尾 一馬, 井上 進, 井上 芳幸, 猪目 祐介, 上野 遥, 大石 理子, 大岡 秀行, 大竹 峻平, 大平 豊, 荻野 桃子, 奥村 暁, 折戸 玲子, 加賀谷 美佳, 格和 純, 片岡 淳, 片桐 英明, 株木 重人, 河島 孝則, 川中 宣太, 岸本 哲朗, 櫛田 淳子, 郡司 修一, 郡和 範, 小島 拓実, 小谷 一仁, 小山 志勇, 今野 裕介, 齋藤 浩二, 榊 直人, 佐々木 浩人, 澤田 真理, 柴田 徹, 管原 隆希, 高橋 慶太郎, 高橋 弘充, 高橋 光成, 高見 一, 田島 宏康, 立原 研悟, 田中 駿也, 田中 真伸, 千川 道幸, 辻本 晋平, 土屋 優悟, 坪根 義雄, 寺島 幸功, 當真 賢二, 門叶 冬樹, 鳥居 和史, 内藤 統也, 中嶋 大輔, 長瀬 重博, 中森 健之, 中山 和則, 永吉 勤, 西嶋 恭司, 野里 明香, 野田 浩司, 畑中 謙一郎, 花畑 義隆, 馬場 浩則, 早川 貴敬, 林田 将明, 原 敏, 馬場 彩, 日高 直哉, 広谷 幸一, 深沢 泰司, 福井 康雄, 藤田 裕, 増田 周, 松本 浩典, 水野 恒史, 村石 浩, 村瀬 孔大, 森 浩二, 柳田 昭平, 山崎 了, 山本 常夏, 山本 宏昭, 吉越 貴紀, 吉田 篤正, 吉田 龍正, 李 兆衡

    日本物理学会講演概要集   68.2.1   103  2013年

    DOI CiNii

  • Current status and optimization of handy compton camera using 3D position-sensitive scintillators

    Toru Nishiyama, Jun Kataoka, Aya Kishimoto, Takuya Fujita, Kenshiro Takeuchi, Shinji Ohsuka, Sigeyuki Nakamura, Syunsuke Adachi, Michito Hirayanagi, Tetsuya Uchiyama, Yoshitaka Ishikawa, Takuya Kato

    IEEE Nuclear Science Symposium Conference Record    2013年

    　概要を見る

    After the Japanese nuclear disaster in 2011, a large amount of radioactive isotopes was released and still remains a serious problem in Japan. To help identify radiation hotspots and ensure effective decontamination operation, we are developing a novel Compton camera weighing only 1.9 kg and measuring just 14×14×15 cm3 in size. Despite its compactness, the camera realizes a wide 180° field of vision, Δθ ∼ 10°(FWHM) angular resolution, and offers excellent sensitivity that can image a hotspot producing a 5 μSv/h dose at a distance of three meters, every 10 sec. Our key technology using 3D position-sensitive scintillators coupled with thin monolithic MPPC arrays has made this innovation possible for the first time. In this paper, we present the detailed optimization and simulation of the Compton camera currently under production with Hamamatsu Photonics. © 2013 IEEE.

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  • Gamma-ray visualization module

    H. Suzuki, S. Nakamura, M. Hirayanagi, S. Adachi, T. Uchiyama, S. Ohsuka, K. Nakamoto, J. Kataoka, T. Nishiyama, T. Fujita, K. Takeuchi

    IEEE Nuclear Science Symposium Conference Record    2013年

    　概要を見る

    Gamma ray cameras can easily locate radiation hotspots where decontamination is required. Among them, the Compton camera that utilizes the Compton scattering is compact and lightweight because no radiation shielding is required. We have developed a Compton camera for quick visualization of the radioactive contamination. It features high detection efficiency by utilizing gamma ray detectors which is a combination of Multi-Pixel Photon Counter (MPPC) array and Gadolinium Aluminum Gallium Garnet (GAGG) scintillator arrays. © 2013 IEEE.

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  • Stereo Compton cameras for the 3-D localization of radioactive isotopes optimized by Geant4

    K. Takeuchi, J. Kataoka, T. Nishiyama, T. Fujita, A. Kishimoto, S. Ohsuka, S. Nakamura, A. Adachi, M. Hirayanagi, T. Uchiyama, Y. Ishikawa, T. Kato

    IEEE Nuclear Science Symposium Conference Record    2013年

    　概要を見る

    The Compton camera is a convenient tool used to visualize the distribution of radioisotopes that emit gamma rays. Following the nuclear disaster in Fukushima in 2011, there is a particularly urgent need to develop 'gamma cameras', which can visualize the distribution of such radioisotopes. In response, we propose a portable Compton camera, which comprises 3-D position-sensitive GAGG scintillators coupled with thin monolithic MPPC arrays. We report on the detailed optimization of the detector design, based on Geant4 simulation. The results show that detection efficiency reaches up to 0.54%, or more than 10 times that of other cameras being tested in Fukushima, along with a moderate angular resolution of 8.1° (FWHM). By applying the triangular surveying method, we also propose a new concept for the 'stereo' measurement of gamma rays by using two Compton cameras, thus enabling the 3-D positional measurement of radioactive isotopes for the first time. From one point source simulation data, we ensured that the source position and the distance to the same could be determined typically to within 2 meters' accuracy and we also confirmed that more than two sources are clearly separated by the event selection from two point sources of simulation data. © 2013 IEEE.

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  • Development of the photomultiplier-tube readout system for the CTA large size telescope

    H. Kubo, R. Paoletti, Y. Awane, A. Bamba, M. Barcelo, J. A. Barrio, O. Blanch, J. Boix, C. Delgado, D. Fink, D. Gascon, S. Gunji, R. Hagiwara, Y. Hanabata, K. Hatanaka, M. Hayashida, M. Ikeno, S. Kabuki, H. Katagiri, J. Kataoka, Y. Konno, S. Koyama, T. Kishimoto, J. Kushida, G. Martínez, S. Masuda, J. M. Miranda, R. Mirzoyan, T. Mizuno, T. Nagayoshi, D. Nakajima, T. Nakamori, H. Ohoka, A. Okumura, R. Orito, T. Saito, A. Sanuy, H. Sasaki, M. Sawada, T. Schweizer, R. Sugawara, K. H. Sulanke, H. Tajima, M. Tanaka, S. Tanaka, L. A. Tejedor, Y. Terada, M. Teshima, F. Tokanai, Y. Tsuchiya, T. Uchida, H. Ueno, K. Umehara, T. Yamamoto

    Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013   2013-October  2013年

    　概要を見る

    We have developed a prototype of the photomultiplier tube (PMT) readout system for the Cherenkov Telescope Array (CTA) Large Size Telescope (LST). Two thousand PMTs along with their readout systems are arranged on the focal plane of each telescope, with one readout system per 7-PMT cluster. The Cherenkov light pulses generated by the air showers are detected by the PMTs and amplified in a compact, low noise and wide dynamic range gain block. The output of this block is then digitized at a sampling rate of the order of GHz using the Domino Ring Sampler DRS4, an analog memory ASIC developed at Paul Scherrer Institute. The sampler has 1,024 capacitors per channel and four channels are cascaded for increased depth. After a trigger is generated in the system, the charges stored in the capacitors are digitized by an external slow sampling ADC and then transmitted via Gigabit Ethernet. An onboard FPGA controls the DRS4, trigger threshold, and Ethernet transfer. In addition, the control and monitoring of the Cockcroft-Walton circuit that provides high voltage for the 7-PMT cluster are performed by the same FPGA. A prototype named Dragon has been developed that has successfully sampled PMT signals at a rate of 2 GHz, and generated single photoelectron spectra.

  • MAGIC and multi-wavelength observations of the radio galaxy NGC 1275

    Pierre Colin, Dorit Eisenacher, Dorothée Hildebrand, Elina Lindfors, Saverio Lombardi, Kari Nilsson, Serena Partini, Fabrizio Tavecchio, Fabio Zandanel, Barabara Balmaverde, Jun Kataoka, Rami Rekola, Yosuke Takahashi

    Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013   2013-October  2013年

    　概要を見る

    The massive radio galaxy NGC 1275 at the center of the Perseus cluster is regularly observed with the MAGIC telescopes since 2009. The observation campaign (in stereoscopic mode) between August 2010 and February 2011 leads to the first detection of the source in very high energy (VHE, >100 GeV) γ rays. NGC 1275 is one of the few non-Blazar AGNs detected in this domain which is highly dominated by BL Lac objects. The proximity and the relatively large angle between the jet axis and the line of sight allow to resolve inner-jet structures with radio interferometry and to test non-thermal emission model for larger viewing angles. NGC 1275 is then a good laboratory to locate the γ -ray emission region and understand acceleration process at work in AGNs. Here we present the long term monitoring of NGC 1275 with MAGIC as well as with Fermi-LAT (in GeV band), KVA (optical) and VLBA (15 GHz). The multiwavelength lightcurves show a correlation between γ - ray, optical and a radio component of the inner-jet. We reconstructed the broad band spectral energy distributions (SED) of the source during two separated MAGIC campaigns which both lead to the detection of NGC 1275 in VHE. We applied a one-zone Synchrotron Self Compton model with a small Doppler factor (2) which can fit the SEDs and reproduces the optical/gamma correlation. Finally, we will discuss the validity of this simple model and the implication of our results for the AGN physics.

  • Fermi -LAT and Suzaku observations of the radio galaxy Centaurus B

    J. Katsuta, Y. T. Tanaka, L. Stawarz, S. P. O'Sullivan, C. C. Cheung, J. Kataoka, S. Funk, T. Yuasa, H. Odaka, T. Takahashi, J. Svoboda

    Astronomy and Astrophysics   550  2013年

    　概要を見る

    Centaurus B is a nearby radio galaxy positioned in the southern hemisphere close to the Galactic plane. Here we present a detailed analysis of about 43 months of accumulated Fermi-LAT data of the γ-ray counterpart of the source initially reported in the 2nd Fermi-LAT catalog, and of newly acquired Suzaku X-ray data. We confirm its detection at GeV photon energies and analyze the extension and variability of the γ-ray source in the LAT dataset, in which it appears as a steady γ-ray emitter. The X-ray core of Centaurus B is detected as a bright source of a continuum radiation. We do not detect, however, any diffuse X-ray emission from the known radio lobes, with the provided upper limit only marginally consistent with the previously claimed ASCA flux. Two scenarios that connect the X-ray and γ-ray properties are considered. In the first one, we assume that the diffuse non-thermal X-ray emission component is not significantly below the derived Suzaku upper limit. In this case, modeling the inverse-Compton emission shows that the observed γ-ray flux of the source may in principle be produced within the lobes. This association would imply that efficient in-situ acceleration of the radiating electrons is occurring and that the lobes are dominated by the pressure from the relativistic particles. In the second scenario, with the diffuse X-ray emission well below the Suzaku upper limits, the lobes in the system are instead dominated by the magnetic pressure. In this case, the observed γ-ray flux is not likely to be produced within the lobes, but instead within the nuclear parts of the jet. By means of synchrotron self-Compton modeling, we show that this possibility could be consistent with the broad-band data collected for the unresolved core of Centaurus B, including the newly derived Suzaku spectrum. © ESO, 2013.

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  • Geometry dependence of the light collection efficiency of BGO crystal scintillators read out by avalanche photo diodes

    M. Sasano, H. Nishioka, S. Okuyama, K. Nakazawa, K. Makishima, S. Yamada, T. Yuasa, A. Okumura, J. Kataoka, Y. Fukazawa, Y. Hanabata, K. Hayashi

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   715   105 - 111  2013年

    　概要を見る

    Abstract Light collection efficiency from BGO crystal scintillators of various sizes and shapes was measured by reading them using 1×1 cm 2 avalanche photo diodes. When the crystals have simple geometry, the light collection efficiency was found to depend on their size, shape and the read-out position through a rather well-defined empirical scaling relation. The light collection efficiency of tapered crystals was seen to depend on both the position of γ-ray irradiation, and the read-out position of the avalanche photo diodes. Using optical Monte-Carlo simulations, the relation was reproduced assuming plausible proper parameters for surface conditions and the attenuation length. This results were reproduced with a reasonable accuracy by optical Monte-Carlo simulations. Simple physical explanations are given to these geometrical effects. © 2013 Elsevier B.V.

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  • Development of signal processing system of avalanche photo diode for space observations by Astro-H

    Ohno M, Goto K, Hanabata Y, Takahashi H, Fukazawa Y, Yoshino M, Saito T, Nakamori T, Kataoka J, Sasano M, Torii S, Uchiyama H, Nakazawa K, Watanabe S, Kokubun M, Ohta M, Sato T, Takahashi T, Tajima H

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   699   112 - 115  2013年  [査読有り]

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  • A novel gamma-ray detector with submillimeter resolutions using a monolithic MPPC array with pixelized Ce:LYSO and Ce:GGAG crystals

    T. Kato, J. Kataoka, T. Nakamori, T. Miura, H. Matsuda, A. Kishimoto, K. Sato, Y. Ishikawa, K. Yamamura, S. Nakamura, N. Kawabata, H. Ikeda, S. Yamamoto, K. Kamada

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   699   235 - 241  2013年01月  [査読有り]

    　概要を見る

    We have developed a large-area monolithic Multi-Pixel Photon Counter (MPPC) array consisting of 4 x 4 channels with a three-side buttable package. Each channel has a photosensitive area of 3 x 3 mm(2) and 3600 Geiger mode avalanche photodiodes (APDs). For typical operational gain of 7.5 x 10(5) at +20 degrees C, gain fluctuation over the entire MPPC device is only +/- 5.6%, and dark count rates (as measured at the 1 p.e. level) amount to &lt;= 400 kcps per channel. We first fabricated a gamma-ray camera consisting of the MPPC array with one-to-one coupling to a Ce-doped (Lu, Y)(2)(SiO4)O (Ce:LYSO) crystal array (4 x 4 array of 3 x 3 x 10 mm(3) crystals). Energy and time resolutions of 11.5 +/- 0.5% (FWHM at 662 keV) and 493 +/- 22 ps were obtained, respectively. When using the charge division resistor network, which compiles signals into four position-encoded analog outputs, the ultimate positional resolution is estimated as 0.19 mm in both X and Y directions, while energy resolution of 10.2 +/- 0.4% (FWHM) was obtained. Finally, we fabricated submillimeter Ce:LYSO and Ce-doped Gd3Ga3Al2O12 (Ce:GGAG) scintillator matrices each consisting of 1.0 x 1.0, 0.7 x 0.7 and 0.5 x 0.5 mm(2) pixels, to further improve the spatial resolution. In all types of Ce:LYSO and Ce:GGAG matrices, each crystal was clearly resolved in the position histograms when irradiated by a Cs-137 source. The energy resolutions for 662 keV gamma-rays for each Ce:LYSO and Ce:GGAG scintillator matrix were &lt;= 14.3%. These results suggest excellent potential for its use as a high spatial medical imaging device, particularly in positron emission tomography (PET). (C) 2012 Elsevier B.V. All rights reserved.

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  • Development of high performance Avalanche Photodiodes and dedicated analog systems for HXI/SGD detectors onboard the Astro-H mission

    T. Saito, T. Nakamori, M. Yoshino, H. Mizoma, J. Kataoka, K. Kawakami, Y. Yatsu, M. Ohno, K. Goto, Y. Hanabata, H. Takahashi, Y. Fukazawa, M. Sasano, S. Torii, H. Uchiyama, K. Nakazawa, K. Makishima, S. Watanabe, M. Kokubun, T. Takahashi, K. Mori, H. Tajima

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   699   230 - 234  2013年01月  [査読有り]

    　概要を見る

    Hard X-ray Imager and Soft Gamma-ray Detector are being developed as onboard instruments for the Astro-H mission, which is scheduled for launch in 2014. In both detectors, EGO scintillators play key roles in achieving high sensitivity in low Earth orbit (LEO), by generating active veto signals to reject cosmic-ray events and gamma-ray backgrounds from radio-activated detector materials. In order to maximize background rejection power, it is also important to minimize the energy threshold of this shield. As a readout sensor of weak scintillation light from a number of EGO crystals in a complicated detector system, high performance, reverse-type Avalanche Photodiodes (APDs), with an effective area of 10 x 10 mm(2) are being employed, instead of bulky photomultiplier tubes (PMTs). Another advantage of using APDs is their low power consumption, although the relatively low gain of APDs (compared to conventional PMTs) requires dedicated analog circuits for noise suppression. In this paper, we report on the development and performance of APD detectors specifically designed for the Astro-H mission. In addition to APD performance, various environmental tests, including radiation hardness and qualification thermal cycling, will be described in detail. Moreover, a dedicated charge sensitive amplifier and analog filters are newly developed and tested here to optimize the performance of APDs to activate fast veto signals within a few is from the EGO trigger. We will also report on overall performance testing of a prototype EGO detector system that mimics the data acquisition system onboard Astro-H. (C) 2012 Elsevier B.V. All rights reserved.

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    10
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  • Development of a dual-sided readout DOI-PET module using large-area monolithic mppc-arrays

    Aya Kishimoto, Jun Kataoka, Takuya Kato, Takamasa Miura, Takeshi Nakamori, Kei Kamada, Shigeyuki Nakamura, Kenichi Sato, Yoshitaka Ishikawa, Kazuhisa Yamamura, Nobuyuki Kawabata, Seiichi Yamamoto

    IEEE Transactions on Nuclear Science   60 ( 1 ) 38 - 43  2013年

    　概要を見る

    We are proposing a novel design for a module with depth of interaction (DOI) capability for gamma rays by measuring the pulse-height ratio of double-sided Multi-Pixel Photon Counters (MPPCs) coupled at both ends of a scintillation crystal block. Thanks to newly developed monolithic MPPC arrays consisting of 4 × 4 channels with a three-side buttable package, the module is very thin and compact, thereby enabling less dead space between each module when arranged into a fully designed gantry. To demonstrate our concept of a DOI measuring technique, we first made a 1-D crystal array consisting of five Ce-doped Gd3Al2Ga3O12 (Ce:GAGG) cubic crystals measuring 3× 3× 3\\mm3 in size, separated by a layer of air approximately 10 μ m-thick. When the light signals output from both ends are read with the 3× 3 mm2 MPPCs, the position of each crystal is clearly distinguished. The same measurements were also made using Ce-doped (Lu,Y)2(SiO4)O(Ce:LYSO), achieving a similarly good separation. We then fabricated thin Ce:GAGG 2-D crystal arrays consisting of two types: [A] 4 × 4 matrix of 3× 3× 3mm} 3 pixels, and [B] 10 × 10 matrix of 0.8× 0.8× 5 mm3 pixels, with each pixel divided by a BaSO4 reflector 0.2 mm-thick. Then four arrays are laid on top of each other facing the DOI direction through a layer of air 10 μm-thick. We demonstrated that the 3-D position of each Ce:GAGG pixel is clearly distinguished in both the 2-D and DOI directions for type A and B when illuminated by 662 keV gamma rays. Average energy resolutions of 9.8 ± 0.8% and 11.8 ± 1.3% were obtained for types A and B, respectively. These results suggest that our proposed method is simple and offers promise in achieving both excellent spatial and energy resolutions for future medical imaging, particularly in positron emission tomography (PET). © 1963-2012 IEEE.

    DOI

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    70
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  • Development of a dual-sided readout DOI-PET module using large-area monolithic mppc-arrays

    Aya Kishimoto, Jun Kataoka, Takuya Kato, Takamasa Miura, Takeshi Nakamori, Kei Kamada, Shigeyuki Nakamura, Kenichi Sato, Yoshitaka Ishikawa, Kazuhisa Yamamura, Nobuyuki Kawabata, Seiichi Yamamoto

    IEEE Transactions on Nuclear Science   60 ( 1 ) 38 - 43  2013年

    　概要を見る

    We are proposing a novel design for a module with depth of interaction (DOI) capability for gamma rays by measuring the pulse-height ratio of double-sided Multi-Pixel Photon Counters (MPPCs) coupled at both ends of a scintillation crystal block. Thanks to newly developed monolithic MPPC arrays consisting of 4 × 4 channels with a three-side buttable package, the module is very thin and compact, thereby enabling less dead space between each module when arranged into a fully designed gantry. To demonstrate our concept of a DOI measuring technique, we first made a 1-D crystal array consisting of five Ce-doped Gd3Al2Ga3O12 (Ce:GAGG) cubic crystals measuring 3× 3× 3\\mm3 in size, separated by a layer of air approximately 10 μ m-thick. When the light signals output from both ends are read with the 3× 3 mm2 MPPCs, the position of each crystal is clearly distinguished. The same measurements were also made using Ce-doped (Lu,Y)2(SiO4)O(Ce:LYSO), achieving a similarly good separation. We then fabricated thin Ce:GAGG 2-D crystal arrays consisting of two types: [A] 4 × 4 matrix of 3× 3× 3mm} 3 pixels, and [B] 10 × 10 matrix of 0.8× 0.8× 5 mm3 pixels, with each pixel divided by a BaSO4 reflector 0.2 mm-thick. Then four arrays are laid on top of each other facing the DOI direction through a layer of air 10 μm-thick. We demonstrated that the 3-D position of each Ce:GAGG pixel is clearly distinguished in both the 2-D and DOI directions for type A and B when illuminated by 662 keV gamma rays. Average energy resolutions of 9.8 ± 0.8% and 11.8 ± 1.3% were obtained for types A and B, respectively. These results suggest that our proposed method is simple and offers promise in achieving both excellent spatial and energy resolutions for future medical imaging, particularly in positron emission tomography (PET). © 1963-2012 IEEE.

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    70
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  • Binary Millisecond Pulsar Discovery via Gamma-Ray Pulsations

    Pletsch H. J, Guillemot L, Fehrmann H, Allen B, Kramer M, Aulbert C, Ackermann M, Ajello M, de Angelis A, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Borgland A. W, Bottacini E, Brandt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chaves R. C. G, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, D'Ammando F, Dermer C. D, Digel S. W, Drell P. S, Drlica-Wagner A, Dubois R, Dumora D, Favuzzi C, Ferrara E. C, Franckowiak A, Fukazawa Y, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, den Hartog P. R, Hayashida M, Hays E, Hill A. B, Hou X, Hughes R. E, Johannesson G, Jackson M. S, Jogler T, Johnson A. S, Johnson W. N, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Massaro F, Mayer M, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mitthumsiri W, Mizuno T, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nemmen R, Nuss E, Ohno M, Ohsugi T, Omodei N, Orienti M, Orlando E, de Palma F, Paneque D, Perkins J. S, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Ray P. S, Razzano M, Reimer A, Reimer O, Reposeur T, Ritz S, Romani R. W, Romoli C, Sanchez D. A, Parkinson P, M. Saz, Schulz A, Sgro C, do Couto e, Silva E, Siskind E. J, Smith D. A, Spandre G, Spinelli P, Suson D. J, Takahashi H, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Tinivella M, Troja E, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Winer B. L, Wood K. S, Wood M, Yang Z, Zimmer S

    SCIENCE   338 ( 6112 ) 1314 - 1317  2012年12月  [査読有り]

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  • The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars

    Ackermann M, Ajello M, Allafort A, Schady P, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Blandford R. D, Bloom E. D, Borgland A. W, Bottacini E, Bouvier A, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Cavazzuti E, Cecchi C, Charles E, Chaves R. C. G, Chekhtman A, Cheung C. C, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, D'Ammando F, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Domnguez A, Drell P. S, Drlica-Wagner A, Favuzzi C, Fegan S. J, Focke W. B, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grove J. E, Guiriec S, Gustafsson M, Hadasch D, Hayashida M, Hays E, Jackson M. S, Jogler T, Kataoka J, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Longo F, Loparco F, Lovellette M. N, Lubrano P, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Tramacere A, Nuss E, Greiner J, Ohno M, Ohsugi T, Omodei N, Orienti M, Orlando E, Ormes J. F, Paneque D, Perkins J. S, Pesce-Rollins M, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reyes L. C, Ritz S., Rau A, Romoli C, Roth M, Sanchez-Conde M, Sanchez D. A, Scargle J. D, Sgro C, Siskind E. J, Spandre G, Spinelli P, Stawarz Lukasz, Suson D. J, Takahashi H, Tanaka T, Thayer J. G, Thompson D. J, Tibaldo L, Tinivella M, Torres D. F, Tosti G, Troja E, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Winer B. L, Wood K. S, Wood M

    SCIENCE   338 ( 6111 ) 1190 - 1192  2012年11月  [査読有り]

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  • The fermi large area telescope on orbit: Event classification, instrument response functions, and calibration

    M. Ackermann, M. Ajello, A. Albert, A. Allafort, W. B. Atwood, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, J. R. Bogart, E. Bonamente, A. W. Borgland, E. Bottacini, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, Ö Çelik, E. Charles, R. C.G. Chaves, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, R. Corbet, S. Cutini, F. D'Ammando, D. S. Davis, A. De Angelis, M. Deklotz, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, P. Fortin, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, B. Giebels, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, S. Guiriec, D. Hadasch, M. Hayashida, E. Hays, D. Horan, X. Hou, R. E. Hughes, M. S. Jackson, T. Jogler, G. Jóhannesson, R. P. Johnson, T. J. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, C. Lavalley, M. Lemoine-Goumard, F. Longo

    Astrophysical Journal, Supplement Series   203 ( 1 )  2012年11月

    　概要を見る

    The Fermi Large Area Telescope (Fermi-LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view, high-energy γ-ray telescope, covering the energy range from 20MeV to more than 300GeV. During the first years of the mission, the LAT team has gained considerable insight into the in-flight performance of the instrument. Accordingly, we have updated the analysis used to reduce LAT data for public release as well as the instrument response functions (IRFs), the description of the instrument performance provided for data analysis. In this paper, we describe the effects that motivated these updates. Furthermore, we discuss how we originally derived IRFs from Monte Carlo simulations and later corrected those IRFs for discrepancies observed between flight and simulated data. We also give details of the validations performed using flight data and quantify the residual uncertainties in the IRFs. Finally, we describe techniques the LAT team has developed to propagate those uncertainties into estimates of the systematic errors on common measurements such as fluxes and spectra of astrophysical sources. © 2012 The American Astronomical Society. All rights reserved.

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  • Development of a MPPC-based DOI-PET module with submillimeter 3-D resolution

    Kishimoto, A, Kataoka, J, Kato, T, Miura, T, Nakamori, T, Kamada, K, Nakamura, S, Sato, K, Ishikawa, Y, Ymamura, K, Yamamoto, S

    2012 IEEE NSS/MIC Conference Record     3128 - 3133  2012年10月

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  • High position resolution gamma-ray imagers consisting of a monolithic MPPC array with submillimeter pixelized scintillator crystals

    Kato, T, Kataoka, J, Nakamori, T, Kishimoto, A, Yamamoto, S, Sato, K, Ishikawa, Y, Yamamura, K, Nakamura, S, Kawabata, N, Ikeda, H, Kamada, K

    2012 IEEE NSS/MIC Conference Record     3146 - 3152  2012年10月

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  • FERMI OBSERVATIONS OF gamma-RAY EMISSION FROM THE MOON

    Abdo A. A, Ackermann M, Ajello M, Atwoo W. B, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bonamente E, Borgland A. W, Bottacini E, Bouvier A, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, D'Ammando F, de Angelis A, de Palma F, Dermer C. D, Digel S. W, Silva E. do Couto E, Drell P. S, Drlica-Wagner A, Dubois R, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Gomez-Vargas G. A, Grenier I. A, Grove J. E, Guiriec S, Hadasch D, Hays E, Hill A. B, Horan D, Hou X, Hughes R. E, Iafrate G, Jackson M. S, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orienti M, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Poon H, Porter T. A, Prokhorov D, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Rochester L. S, Roth M, Sadrozinski H. F. -W, Sanchez D. A, Sbarra C, Schalk T. L, Sgro C, Share G. H, Siskind E. J, Spandre G, Spinelli P, Stawarz L, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tinivella M, Torres D. F, Tosti G, Troja E, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Wang P, Winer B. L, Wood D. L, Wood K. S, Yang Z, Zimmer S

    ASTROPHYSICAL JOURNAL   758 ( 2 )  2012年10月  [査読有り]

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  • 未同定ガンマ線天体1FGL J1311.7-3429 のX線・可視光観測

    J.Kataoka

    The Astrophysical Journal   757 ( 2 ) 176 - 184  2012年10月  [査読有り]

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  • TOWARD IDENTIFYING THE UNASSOCIATED GAMMA-RAY SOURCE 1FGL J1311.7-3429 WITH X-RAY AND OPTICAL OBSERVATIONS

    J. Kataoka, Y. Yatsu, N. Kawai, Y. Urata, C. C. Cheung, Y. Takahashi, K. Maeda, T. Totani, R. Makiya, H. Hanayama, T. Miyaji, A. Tsai

    ASTROPHYSICAL JOURNAL   757 ( 2 )  2012年10月

    　概要を見る

    We present deep optical and X-ray follow-up observations of the bright unassociated Fermi-LAT gamma-ray source 1FGL J1311.7-3429. The source was already known as an unidentified EGRET source (3EG J1314-3431, EGR J1314-3417), hence its nature has remained uncertain for the past two decades. For the putative counterpart, we detected a quasi-sinusoidal optical modulation of Delta m similar to 2 mag with a period of similar or equal to 1.5 hr in the Rc, r', and g' bands. Moreover, we found that the amplitude of the modulation and peak intensity changed by greater than or similar to 1 mag and similar to 0.5 mag, respectively, over our total six nights of observations from 2012 March to May. Combined with Swift UVOT data, the optical-UV spectrum is consistent with a blackbody temperature, kT similar or equal to 1 eV and the emission volume radius R-bb similar or equal to 1.5 x 10(4) d(kpc) km (d(kpc) is the distance to the source in units of 1 kpc). In contrast, deep Suzaku observations conducted in 2009 and 2011 revealed strong X-ray flares with a light curve characterized with a power spectrum density of P(f) proportional to f(-2.0 +/- 0.4), but the folded X-ray light curves suggest an orbital modulation also in X-rays. Together with the non-detection of a radio counterpart, and significant curved spectrum and non-detection of variability in gamma-rays, the source may be the second "radio-quiet" gamma-ray emitting millisecond pulsar candidate after 1FGL J2339.7-0531, although the origin of flaring X-ray and optical variability remains an open question.

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  • GAMMA-RAY OBSERVATIONS OF THE ORION MOLECULAR CLOUDS WITH THE FERMI LARGE AREA TELESCOPE

    Ackermann M, Ajello M, Allafort A, Antolini E, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bottacini E, Brandt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Cecchi C, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, D'Ammando F, de Angelis A, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Enoto T, Falletti L, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fukazawa Y, Fukui Y, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hayashi K, Horan D, Hou X, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Kerr M, Knodlseder J, Kuss M, Lande J, Larsson S, Lee S. -H, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makishima K, Mazziotta M. N, Mehault J, Mitthumsiri W, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nishino S, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Orienti M, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Porter T. A, Raino S, Razzano M, Reimer A, Reimer O, Roth M, Sadrozinski H. F. -W, Sgro C, Siskind E. J, Spandre G, Spinelli P, Strong A. W, Takahashi H, Takahashi T, Tanaka T, Thayer J. G, Thayer J. B, Tibolla O, Tinivella M, Torres D. F, Tramacere A, Troja E, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Zimmer S

    ASTROPHYSICAL JOURNAL   756 ( 1 )  2012年09月  [査読有り]

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  • Development of a micro-satellite TSUBAME for X-ray polarimetry of GRBs

    Yatsu, Y, Hayashi, M, Kawakami, K, Tokoyoda, K, Enomoto, T, Toizumi, T, Kawai, N, Ishizaka, K, Muta, A, Morishita, H, Matsunaga, S, Nakamori, T, Kataoka, J, Kubo, S

    Proceedings of the International Astronomical Union   279 ( S279 ) 423 - 424  2012年09月

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  • GeV OBSERVATIONS OF STAR-FORMING GALAXIES WITH THE FERMI LARGE AREA TELESCOPE

    Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Cheung C. C, Chiang J, Cillis A. N, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Favuzzi C, Fegan S. J, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Guiriec S, Gustafsson M, Hadasch D, Hayashida M, Hays E, Hughes R. E, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Martin P, Mazziotta M. N, McEnery J. E, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nishino S, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ozaki M, Parent D, Persic M, Pesce-Rollins M, Petrosian V, Pierbattista M, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Roth M, Sbarra C, Sgro C, Siskind E. J, Spandre G, Spinelli P, Stawarz Lukasz, Strong A. W, Takahashi H, Tanaka T, Thayer J. B, Tibaldo L, Tinivella M, Torres D. F, Tosti G, Troja E, Uchiyama Y, Vandenbroucke J, Vianello G, Vitale V, Waite A. P, Wood M, Yang Z

    ASTROPHYSICAL JOURNAL   755 ( 2 )  2012年08月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE STUDY OF COSMIC RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS

    Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bottacini E, Brandt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Busetto G, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, D'Ammando F, de Angelis A, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Falletti L, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fukazawa Y, Fukui Y, Funk S, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashi K, Horan D, Hou X, Hughes R. E, Itoh R, Jackson M. S, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Larsson S, Lee S. -H, Lemoine-Goumard M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Martin P, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nemmen R, Nishino S, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Romoli C, Roth M, Sada T, Sadrozinski H. F. -W, Sanchez D. A, Sbarra C, Sgro C, Siskind E. J, Spandre G, Spinelli P, Strong A. W, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tibolla O, Tinivella M, Torres D. F, Tosti G, Tramacere A, Troja E, Uchiyama Y, Uehara T, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yamamoto H, Yang Z, Zimmer S

    ASTROPHYSICAL JOURNAL   755 ( 1 )  2012年08月  [査読有り]

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  • CONSTRAINING THE HIGH-ENERGY EMISSION FROM GAMMA-RAY BURSTS WITH FERMI

    ASTROPHYSICAL JOURNAL   754 ( 2 )  2012年08月  [査読有り]

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  • Large size single crystal growth of Lu3Al5O12:Pr and their uniformity of scintillation properties

    Kei Kamada, Takayuki Yanagida, Takanori Endo, Kousuke Tsutumi, Masao Yoshino, Jun Kataoka, Yoshiyuki Usuki, Yutaka Fujimoto, Akihiro Fukabori, Akira Yoshikawa

    JOURNAL OF CRYSTAL GROWTH   352 ( 1 ) 91 - 94  2012年08月  [査読有り]

    　概要を見る

    Pr-doped Lu3Al5O12 (Pr:LuAG) single crystals were grown by the Czochralski method. The crystal was seeded-grown in the [100] direction. Dimensions up to 100 mm in length and 92 mm in diameter were achieved without cracking. Using 10 x 10 x 10 mm size sample coupled with photomultiplier (Hamamatsu R3998), energy resolution of 4.6% at 662 keV was achieved. Uniformity of light yield and energy resolution was also evaluated in whole crystal. The deviations of light output, energy resolution, and decay time were +/- 7.9%, 7.2%, and 4.8%, respectively. (C) 2011 Elsevier B.V. All rights reserved.

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  • A STATISTICAL APPROACH TO RECOGNIZING SOURCE CLASSES FOR UNASSOCIATED SOURCES IN THE FIRST FERMI-LAT CATALOG

    Ackermann M, Ajello M, Allafort A, Antolini E, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cavazzuti E, Cecchi C, Celik O, Charles E, Chekhtman A, Chen A. W, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, de Angelis A, DeCesar M. E, De Luca A, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Dubois R, Enoto T, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Gustafsson M, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hays E, Healey S. E, Hill A. B, Horan D, Hou X, Johannesson G, Johnson A. S, Johnson T. J, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mignani R. P, Mitthumsiri W, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Ray P. S, Razzano M, Reimer A, Reimer O, Reposeur T, Romani R. W, Sadrozinski H. F. -W, Salvetti D, Parkinson P, M. Saz, Schalk T. L, Sgro C, Shaw M. S, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Suson D. J, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Troja E, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vilchez N, Vitale V, Waite A. P, Wallace E, Wang P, Winer B. L, Wolff M. T, Wood D. L, Wood K. S, Yang Z, Zimmer S

    ASTROPHYSICAL JOURNAL   753 ( 1 )  2012年07月  [査読有り]

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  • VLBI and single-dish monitoring of 3C 84 for the period 2009-2011

    H. Nagai, M. Orienti, M. Kino, K. Suzuki, G. Giovannini, A. Doi, K. Asada, M. Giroletti, J. Kataoka, F. D'Ammando, M. Inoue, A. Lähteenmäki, M. Tornikoski, J. Léon-Tavares, S. Kameno, U. Bach

    Monthly Notices of the Royal Astronomical Society: Letters   423 ( 1 )  2012年06月

    　概要を見る

    The radio galaxy 3C 84 is a representative of γ -ray-bright misaligned active galactic nuclei (AGNs) and one of the best laboratories to study the radio properties of the subparsec jet in connection with the γ -ray emission. In order to identify possible radio counterparts of γ -ray emissions in 3C 84, we study the change in structure within the central 1 pc and the light curve of subparsec-sized components C1, C2 and C3. We search for any correlation between changes in the radio components and the γ -ray flares by making use of the Very Long Baseline Interferometry (VLBI) and single-dish data. Throughout the radio monitoring spanning over two GeV γ -ray flares detected by the Fermi Large Area Telescope and theMAGIC Cherenkov Telescope during 2009 April-May and 2010 June-August, the total flux density in the radio band increases on average. This flux increase mostly originates in C3. Although γ -ray flares span the time-scale of days to weeks, no clear correlation with the radio light curve on this time-scale is found. No new prominent components and change in morphology associated with the γ -ray flares are found on VLBI images. © 2012 The Authors. Monthly Notices of the Royal Astronomical Society. © 2012 RAS.

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  • MULTI-WAVELENGTH OBSERVATIONS OF BLAZAR AO 0235+164 IN THE 2008-2009 FLARING STATE

    ASTROPHYSICAL JOURNAL   751 ( 2 )  2012年06月  [査読有り]

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  • Expected radiation damage of reverse-type APDs for the Astro-H mission

    J. Kataoka, T. Saito, M. Yoshino, H. Mizoma, T. Nakamori, Y. Yatsu, Y. Ishikawa, Y. Matsunaga, H. Tajima, M. Kokubun, P. G. Edwards

    JOURNAL OF INSTRUMENTATION   7 ( 6 )  2012年06月  [査読有り]

    　概要を見る

    Scheduled for launch in 2014, Astro-H is the sixth Japanese X-ray astronomy satellite mission. More than 60 silicon avalanche photodiodes (Si-APDs; hereafter APDs) will be used to read out BGO scintillators, which are implemented to generate a veto signal to reduce background contamination for the hard X-ray imager (HXI) and a soft gamma-ray detector (SGD). To date, however, APDs have rarely been used in space experiments. Moreover, strict environmental tests are necessary to guarantee APD performance for missions expected to extend beyond five years. The radiation hardness of APDs, as for most semiconductors, is particularly crucial, since radiation in the space environment is severe. In this paper, we present the results of radiation tests conducted on reverse-type APDs (provided by Hamamatsu Photonics) irradiated by gamma rays (Co-60) and 150 MeV protons. We show that, even under the same 100 Gy dose, high energy protons can cause displacement (bulk) damage in the depletion region and possibly change the activation energy, whereas gamma-ray irradiation is less prone to cause damage, because ionization damage dominates only the surface region. We also present quantitative guidance on how to estimate APD noise deterioration over a range of temperatures and radiation doses. As a practical example, we discuss the expected degradation of the BGO energy threshold for the generation of veto signals, following several years of Astro-H operation in Low Earth Orbit (LEO), and directly compare it to experimental results obtained using a small BGO crystal.

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    9
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  • Astro-H衛星搭載のAPD検出器の放射線耐性

    J.Kataoka

    Journal of Instrumentation   7 ( 6 )  2012年06月  [査読有り]

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  • Discovery of the millisecond pulsar PSR J2043+1711 in a Fermi source with the Nançay Radio Telescope

    L. Guillemot, P. C.C. Freire, I. Cognard, T. J. Johnson, Y. Takahashi, J. Kataoka, G. Desvignes, F. Camilo, E. C. Ferrara, A. K. Harding, G. H. Janssen, M. Keith, M. Kerr, M. Kramer, D. Parent, S. M. Ransom, P. S. Ray, P. M. Saz Parkinson, D. A. Smith, B. W. Stappers, G. Theureau

    Monthly Notices of the Royal Astronomical Society   422 ( 2 ) 1294 - 1305  2012年05月

    　概要を見る

    We report the discovery of the millisecond pulsar PSR J2043+1711 in a search of a Fermi Large Area Telescope (LAT) source with no known associations, with the Nançay Radio Telescope. The new pulsar, confirmed with the Green Bank Telescope, has a spin period of 2.38ms, is relatively nearby (kpc) and is in a 1.48-d orbit around a low-mass companion, probably an He-type white dwarf. Using an ephemeris based on Arecibo, Nançay and Westerbork timing measurements, pulsed gamma-ray emission was detected in the data recorded by the Fermi LAT. The gamma-ray light curve and spectral properties are typical of other gamma-ray millisecond pulsars seen with Fermi. X-ray observations of the pulsar with Suzaku and the Swift X-ray Telescope yielded no detection. At 1.4GHz, we observe strong flux density variations because of interstellar diffractive scintillation; however, a sharp peak can be observed at this frequency during bright scintillation states. At 327MHz, the pulsar is detected with a much higher signal-to-noise ratio and its flux density is far more steady. However, at that frequency the Arecibo instrumentation cannot yet fully resolve the pulse profile. Despite that, our pulse time-of-arrival measurements have a post-fit residual rms of 2s. This and the expected stability of this system have made PSR J2043+1711 one of the first new Fermi-selected millisecond pulsars to be added to pulsar gravitational wave timing arrays. It has also allowed a significant measurement of relativistic delays in the times of arrival of the pulses due to the curvature of space-time near the companion, but not yet with enough precision to derive useful masses for the pulsar and the companion. Nevertheless, a mass for the pulsar between 1.7 and 2.0M ⊙ can be derived if a standard millisecond pulsar formation model is assumed. In this paper, we also present a comprehensive summary of pulsar searches in Fermi LAT sources with the Nançay Radio Telescope to date. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.

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  • FERMI-LAT OBSERVATIONS OF THE DIFFUSE gamma-RAY EMISSION: IMPLICATIONS FORCOSMIC RAYS AND THE INTERSTELLAR MEDIUM

    Ackermann M, Ajello M, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgla, A. W, Brandt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, de Angelis A, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Falletti L, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fortin P, Fukazawa Y, Funk S, Fusco P, Gaggero D, Gargano F, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grove J. E, Guiriec S, Gustafsson M, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hays E, Horan D, Hou X, Hughes R. E, Johannesson G, Johnson A. S, Johnson R. P, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Mazziotta M. N, McEnery J. E, Michelson P. F, Mitthumsiri W, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Paneque D, Panetta J. H, Parent D, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Sadrozinski H. F. -W, Sgro C, Siskind E. J, Spandre G, Spinelli P, Strong A. W, Suson D. J, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tinivella M, Torres D. F, Tosti G, Troja E, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Wood M, Yang Z, Ziegler M, Zimmer S

    ASTROPHYSICAL JOURNAL   750 ( 1 )  2012年05月  [査読有り]

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  • Fermi large area telescope second source catalog

    P. L. Nolan, A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, E. Antolini, W. B. Atwood, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, A. Belfiore, R. Bellazzini, B. Berenji, G. F. Bignami, R. D. Blandford, E. D. Bloom, E. Bonamente, J. Bonnell, A. W. Borgland, E. Bottacini, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, R. Campana, B. Cañadas, A. Cannon, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, M. Ceccanti, C. Cecchi, Ö Çelik, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, R. Chipaux, S. Ciprini, R. Claus, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, R. Corbet, S. Cutini, F. D'Ammando, D. S. Davis, A. De Angelis, M. E. Decesar, M. Deklotz, A. De Luca, P. R. Den Hartog, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, D. Dumora, T. Enoto, L. Escande, D. Fabiani, L. Falletti, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, P. Fortin, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, B. Giebels, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, M. Gustafsson, D. Hadasch

    Astrophysical Journal, Supplement Series   199 ( 2 )  2012年04月

    　概要を見る

    We present the second catalog of high-energy γ-ray sources detected by the Large Area Telescope (LAT), the primary science instrument on the Fermi Gamma-ray Space Telescope (Fermi), derived from data taken during the first 24months of the science phase of the mission, which began on 2008 August 4. Source detection is based on the average flux over the 24month period. The second Fermi-LAT catalog (2FGL) includes source location regions, defined in terms of elliptical fits to the 95% confidence regions and spectral fits in terms of power-law, exponentially cutoff power-law, or log-normal forms. Also included are flux measurements in five energy bands and light curves on monthly intervals for each source. Twelve sources in the catalog are modeled as spatially extended. We provide a detailed comparison of the results from this catalog with those from the first Fermi-LAT catalog (1FGL). Although the diffuse Galactic and isotropic models used in the 2FGL analysis are improved compared to the 1FGL catalog, we attach caution flags to 162 of the sources to indicate possible confusion with residual imperfections in the diffuse model. The 2FGL catalog contains 1873 sources detected and characterized in the 100MeV to 100GeV range of which we consider 127 as being firmly identified and 1171 as being reliably associated with counterparts of known or likely γ-ray-producing source classes. © 2012 The American Astronomical Society. All rights reserved.

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  • SUZAKU X-RAY IMAGING OF THE EXTENDED LOBE IN THE GIANT RADIO GALAXY NGC 6251 ASSOCIATED WITH THE FERMI-LAT SOURCE 2FGL J1629.4+8236

    Y. Takeuchi, J. Kataoka, L. Stawarz, Y. Takahashi, K. Maeda, T. Nakamori, C. C. Cheung, A. Celotti, Y. Tanaka, T. Takahashi

    ASTROPHYSICAL JOURNAL   749 ( 1 ) 66  2012年04月  [査読有り]

    　概要を見る

    We report the results of a Suzaku X-ray imaging study of NGC 6251, a nearby giant radio galaxy with intermediate FR I/II radio properties. Our pointing direction was centered on the gamma-ray emission peak recently discovered with the Fermi Large Area Telescope (LAT) around the position of the northwest (NW) radio lobe 15 arcmin offset from the nucleus. After subtracting two "off-source" pointings adjacent to the radio lobe and removing possible contaminants in the X-ray Imaging Spectrometer field of view, we found significant residual X-ray emission most likely diffuse in nature. The spectrum of the excess X-ray emission is well fitted by a power law with a photon index Gamma = 1.90 +/- 0.15 and a 0.5-8 keV flux of 4x10(-13) erg cm(-2) s(-1). We interpret this diffuse X-ray emission component as being due to inverse Compton upscattering of the cosmic microwave background photons by ultrarelativistic electrons within the lobe, with only a minor contribution from the beamed emission of the large-scale jet. Utilizing archival radio data for the source, we demonstrate by means of broadband spectral modeling that the gamma-ray flux of the Fermi-LAT source 2FGL J1629.4+8236 may well be accounted for by the high-energy tail of the inverse Compton continuum of the lobe. Thus, this claimed association of gamma-rays from the NW lobe of NGC 6251, together with the recent Fermi-LAT imaging of the extended lobes of Centaurus A, indicates that particles may be efficiently (re-)accelerated up to ultrarelativistic energies within extended radio lobes of nearby radio galaxies in general.

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  • Development of X-ray/gamma-ray imaging spectrometers using reach-through APD arrays

    Nakamori, T, Enomoto, T, Toizumi, T, Tokoyoda, K, Yatsu, Y, Kawai, N, Kataoka, J, Ishikawa, Y, Kawai, T, Kawabata, N, Matsunaga, Y

    Journal of Instrumentaion   7 ( 3 ) C03038 - 10pp  2012年03月  [査読有り]

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  • SEARCH FOR GAMMA-RAY EMISSION FROM X-RAY-SELECTED SEYFERT GALAXIES WITH FERMI-LAT

    Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom E. D, Bonamente E, Borgland A. W, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, D'Ammando F, de Angelis A, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Enoto T, Favuzzi C, Fegan S. J, Ferrara E. C, Fortin P, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Godfrey G, Grove J. E, Guiriec S, Hadasch D, Hayashida M, Hays E, Hughes R. E, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Mazziotta M. N, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nishino S, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Orlando E, Ozaki M, Paneque D, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Roth M, Sanchez D. A, Sbarra C, Sgro C, Siskind E. J, Spandre G, Spinelli P, Stawarz L, Strong A. W, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thompson D. J, Tibaldo L, Tinivella M, Torres D. F, Tosti G, Troja E, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Winer B. L, Wood K. S, Wood M, Yang Z, Zimmer S

    ASTROPHYSICAL JOURNAL   747 ( 2 )  2012年03月  [査読有り]

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  • SEARCH FOR DARK MATTER SATELLITES USING FERMI-LAT

    Ackermann M, Albert A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bottacini E, Brandt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Burnett T. H, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Essig R, Falletti L, Favuzzi C, Fegan S. J, Focke W. B, Fukazawa Y, Funk S, Fusco P, Gargano F, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Guiriec S, Gustafsson M, Hadasch D, Hayashida M, Hou X, Hughes R. E, Johnson R. P, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lionetto A. M, Garde M. Llena, Longo F, Loparco F, Lovellette M. N, Lubrano P, Mazziotta M. N, McEnery J. E, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Norris J. P, Nuss E, Ohsugi T, Okumura A, Orlando E, Ormes J. F, Ozaki M, Paneque D, Pelassa V, Pierbattista M, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Sadrozinski H. F. -W, Sehgal N, Sgro C, Siskind E. J, Spinelli P, Strigari L, Suson D. J, Tajima H, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Tibaldo L, Tinivella M, Torres D. F, Troja E, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Zalewski S, Zimmer S

    ASTROPHYSICAL JOURNAL   747 ( 2 )  2012年03月  [査読有り]

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  • Discovery of an unidentified Fermi object as a black widow-like millisecond pulsar

    A. K.H. Kong, R. H.H. Huang, K. S. Cheng, J. Takata, Y. Yatsu, C. C. Cheung, D. Donato, L. C.C. Lin, J. Kataoka, Y. Takahashi, K. Maeda, C. Y. Hui, P. H.T. Tam

    Astrophysical Journal Letters   747 ( 1 )  2012年03月

    　概要を見る

    The Fermi γ-ray Space Telescope has revolutionized our knowledge of the γ-ray pulsar population, leading to the discovery of almost 100 γ-ray pulsars and dozens of γ-ray millisecond pulsars (MSPs). Although the outer-gap model predicts different sites of emission for the radio and γ-ray pulsars, until now all of the known γ-ray MSPs have been visible in the radio. Here we report the discovery of a "radio-quiet" γ-ray-emitting MSP candidate by using Fermi, Chandra, Swift, and optical observations. The X-ray and γ-ray properties of the source are consistent with known γ-ray pulsars. We also found a 4.63 hr orbital period in optical and X-ray data. We suggest that the source is a black widow-like MSP with a 0.1 M ⊙ late-type companion star. Based on the profile of the optical and X-ray light curves, the companion star is believed to be heated by the pulsar while the X-ray emissions originate from pulsar magnetosphere and/or from intrabinary shock. No radio detection of the source has been reported yet, and although no γ-ray/radio pulsation has been found we estimate that the spin period of the MSP is 3-5 ms based on the inferred γ-ray luminosity. © 2012 The American Astronomical Society. All rights reserved.

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  • SUZAKU X-RAY FOLLOW-UP OBSERVATIONS OF SEVEN UNASSOCIATED FERMI-LAT GAMMA-RAY SOURCES AT HIGH GALACTIC LATITUDES

    Y. Takahashi, J. Kataoka, T. Nakamori, K. Maeda, R. Makiya, T. Totani, C. C. Cheung, L. Stawarz, L. Guillemot, P. C. C. Freire, I. Cognard

    ASTROPHYSICAL JOURNAL   747 ( 1 ) 64 - 79  2012年03月  [査読有り]

    　概要を見る

    We report on our second-year campaign of X-ray follow-up observations of unidentified Fermi Large Area Telescope (LAT) gamma-ray sources at high Galactic latitudes (vertical bar b vertical bar &gt; 10 degrees) using the X-ray Imaging Spectrometer on board the Suzaku X-ray Observatory. In this second year of the project, seven new targets were selected from the First Fermi-LAT Catalog, and studied with 20-40 ks effective Suzaku exposures. We detected an X-ray point source coincident with the position of the recently discovered millisecond pulsar (MSP) PSR J2302+4442 within the 95% confidence error circle of 1FGL J2302.8+4443. The X-ray spectrum of the detected counterpart was well fit by a blackbody model with temperature of kT similar or equal to 0.3 keV, consistent with an origin of the observed X-ray photons from the surface of a rotating magnetized neutron star. For four other targets that were also recently identified with a normal pulsar (1FGL J0106.7+4853) and MSPs (1FGL J1312.6+0048, J1902.0-5110, and J2043.2+1709), only upper limits in the 0.5-10 keV band were obtained at the flux levels of similar or equal to 10(-14) erg cm(-2) s(-1). A weak X-ray source was found in the field of 1FGL J1739.4+8717, but its association with the variable gamma-ray emitter could not be confirmed with the available Suzaku data alone. For the remaining Fermi-LAT object 1FGL J1743.8-7620 no X-ray source was detected within the LAT 95% error ellipse. We briefly discuss the general properties of the observed high Galactic-latitude Fermi-LAT objects by comparing their multiwavelength properties with those of known blazars and MSPs.

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  • Limits on large extra dimensions based on observations of neutron stars with the Fermi-LAT

    M. Ajello, L. Baldini, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, E. D. Bloom, E. Bonamente, A. W. Borgland, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, A. De Angelis, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, T. Enoto, C. Favuzzi, S. J. Fegan, E. C. Ferrara, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, P. Graham, I. A. Grenier, S. Guiriec, M. Gustafsson, D. Hadasch, M. Hayashida, R. E. Hughes, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, A. M. Lionetto, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, M. Pesce-Rollins, M. Pierbattista, F. Piron, G. Pivato, S. Rainò, M. Razzano, S. Ritz, M. Roth, P. M. Saz Parkinson, J. D. Scargle, T. L. Schalk, C. Sgrò, E. J. Siskind, G. Spandre, P. Spinelli

    Journal of Cosmology and Astroparticle Physics   2012 ( 2 )  2012年02月

    　概要を見る

    We present limits for the compactification scale in the theory of Large Extra Dimensions (LED) proposed by Arkani-Hamed, Dimopoulos, and Dvali. We use 11 months of data from the Fermi Large Area Telescope (Fermi-LAT) to set gamma ray flux limits for 6 gamma-ray faint neutron stars (NS). To set limits on LED we use the model of Hannestad and Raffelt (HR) that calculates the Kaluza-Klein (KK) graviton production in supernova cores and the large fraction subsequently gravitationally bound around the resulting NS. The predicted decay of the bound KK gravitons to γγ should contribute to the flux from NSs. Considering 2 to 7 extra dimensions of the same size in the context of the HR model, we use Monte Carlo techniques to calculate the expected differential flux of gamma-rays arising from these KK gravitons, including the effects of the age of the NS, graviton orbit, and absorption of gamma-rays in the magnetosphere of the NS. We compare our Monte Carlo-based differential flux to the experimental differential flux using maximum likelihood techniques to obtain our limits on LED. Our limits are more restrictive than past EGRET-based optimistic limits that do not include these important corrections. Additionally, our limits are more stringent than LHC based limits for 3 or fewer LED, and comparable for 4 LED. We conclude that if the effective Planck scale is around a TeV, then for 2 or 3 LED the compactification topology must be more complicated than a torus. © 2012 IOP Publishing Ltd and SISSA.

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  • Development of a scintillation detector using a MPPC as an alternative to an APD

    T. Miura, T. Nakamori, J. Kataoka, T. Kato, K. Sato, Y. Ishikawa, K. Yamamura, N. Kawabata

    JOURNAL OF INSTRUMENTATION   7 ( 2 ) C020306  2012年02月  [査読有り]

    　概要を見る

    We conducted a study to examine the performance of the multi-pixel photon counter(MPPC). The MPPC is a novel type of semiconductor photodetector consisting of multiple avalanche photodiode (APD) pixels operated in Geiger mode. Whereas the MPPC offers a great advantage in signal multiplication comparable to that achieved by the photomultiplier tube (PMT), the detection of weak scintillation light signals is difficult due to the severe contamination of dark counts. In this study, we first compared the energy resolutions and energy thresholds of a 3x3 mm(2) MPPC with those of a 3x3 mm(2) APD as scintillation detectors. The MPPC and APD were optically coupled with 5x5x5 mm(3) scintillation crystals of BGO, Tl:CsI, Pr:LuAG, and YAG. It turned out that the APD had better energy resolutions for 662 keV gamma-rays, while the MPPC had lower energy thresholds as measured using a test pulse. Despite the low energy thresholds, it is difficult for the MPPC to detect low energy gamma-rays due to the contamination of dark counts. Secondly, we applied a coincidence technique to discriminate weak gamma-ray signals from dark counts by using scintillation detectors that consisted of a 2x2 MPPC-array optically coupled with 10x10x10 mm(3) crystals of GSO, BGO, and Pr: LuAG. With this technique, we demonstrated that dark counts achieved a rejection efficiency of more than 99.8%. As a result, 22.2 keV gamma-rays were successfully detected with a GSO scintillator as measured at + 20 degrees C.

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  • EXPLORING THE CENTRAL SUB-PARSEC REGION OF THE gamma-RAY BRIGHT RADIO GALAXY 3C 84 WITH VLBA AT 43 GHz IN THE PERIOD OF 2002-2008

    Kenta Suzuki, Hiroshi Nagai, Motoki Kino, Jun Kataoka, Keiichi Asada, Akihiro Doi, Makoto Inoue, Monica Orienti, Gabriele Giovannini, Marcello Giroletti, Anne Lahteenmaki, Merja Tornikoski, Jonathan Leon-Tavares, Uwe Bach, Seiji Kameno, Hideyuki Kobayashi

    ASTROPHYSICAL JOURNAL   746 ( 2 )  2012年02月  [査読有り]

    　概要を見る

    Following the discovery of a new radio component right before the GeV gamma-ray detection since 2008 August by the Fermi Gamma-ray Space Telescope, we present a detailed study of the kinematics and light curve on the central sub-parsec scale of 3C 84 using the archival Very Long Baseline Array 43 GHz data covering the period between 2002 January and 2008 November. We find that the new component "C3," previously reported by the observations with the Very Long Baseline Interferometer Exploration of Radio Astrometry, was already formed in 2003. The flux density of C3 increases moderately until 2008, and then it becomes brighter rapidly after 2008. The radio core, C1, also shows a similar trend. The apparent speed of C3 with reference to the core C1 shows moderate acceleration from 0.10c to 0.47c between 2003 November and 2008 November, but is still sub-relativistic. We further try to fit the observed broadband spectrum by the one-zone synchrotron self-Compton model using the measured apparent speed of C3. The fit can reproduce the observed gamma-ray emission, but does not agree with the observed radio spectral index between 22 and 43 GHz.

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  • Development of a gamma-ray imager using a large area monolithic 4× 4 MPPC array for a future PET scanner

    Nakamori, T, Kato, T, Kataoka, J, Miura, T, Matsuda, H, Sato, K, Ishikawa, Y, Yamamura, K, Kawabata, N, Ikeda, H, Sato, G, Kamada, K

    Journal of Instrumentaion   7 ( 1 ) C01083 - 13pp  2012年01月  [査読有り]

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  • Periodic Emission from the Gamma-Ray Binary 1FGL J1018.6-5856

    SCIENCE   335 ( 6065 ) 189 - 193  2012年01月  [査読有り]

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  • 13pSP-1 CTA報告38 : 全体報告(13pSP 高エネルギーガンマ線(CTA等),宇宙線・宇宙物理領域)

    手嶋 政廣, 窪 秀利, 戸谷 友則, 浅野 勝晃, 粟根 悠介, 井岡 邦仁, 井上 進, 井上 芳幸, 上野 遥, 梅原 克典, 大石 理子, 大岡 秀行, 大平 豊, 奥田 武志, 奥村 曉, 折戸 玲子, 加賀谷 美佳, 格和 純, 片岡 淳, 片桐 秀明, 株木 重人, 川中 宣太, 岸本 哲朗, 北本 兼続, 櫛田 淳子, 郡司 修一, 郡 和範, 小谷 一仁, 小山 志勇, 今野 裕介, 齋藤 浩二, 斎藤 雄太朗, 榊 直人, 峪中 良介, 佐々木 浩人, 澤田 真理, 柴田 徹, 渋谷 明伸, 周 小渓, 菅原 隆希, 高橋 慶太郎, 高橋 弘充, 高見 一, 田島 宏康, 田中 駿也, 田中 真伸, 千川 道幸, 寺田 幸功, 當真 賢二, 門叶 冬樹, 鳥居 和史, 内藤 統也, 中嶋 大輔, 長滝 重博, 中森 健之, 中山 和則, 西嶋 恭司, 野里 明香, 萩原 亮太, 畑中 謙一郎, 馬場 浩則, 早川 貴敬, 林田 将明, 原 敏, 馬場 彩, 日高 直哉, 深沢 泰司, 福井 康雄, 藤田 裕, 松本 浩典, 水野 恒史, 村石 浩, 村瀬 孔大, 森 浩二, 柳田 昭平, 山崎 了, 山本 常夏, 山本 宏昭, 吉越 貴紀, 吉田 篤正, 吉田 龍生, 李 兆衡

    日本物理学会講演概要集   67.2.1   114  2012年

    DOI CiNii

  • Development of a MPPC-based DOI-PET module with submillimeter 3-D resolution

    Aya Kishimoto, Jun Kataoka, Takuya Kato, Takamasa Miura, Takeshi Nakamori, Kei Kamada, Shigeyuki Nakamura, Kenichi Sato, Yoshitaka Ishikawa, Kazuhisa Yamamura, Seiichi Yamamoto

    2012 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE RECORD (NSS/MIC)     3128 - 3133  2012年  [査読有り]

    　概要を見る

    We are proposing a novel design for a module with depth of interaction (DOI) capability for gamma rays by measuring the pulse-height ratio of double-sided Multi-Pixel Photon Counters (MPPCs) coupled at both ends of a scintillation crystal block. Thanks to newly developed monolithic MPPC arrays consisting of 4 x 4 channels with a three-side buttable package, the module is very thin and compact, thereby enabling less dead space between each module when arranged into a fully designed gantry. To demonstrate our concept of a DOI measuring technique, we first made a 1-D crystal array consisting of five Ce-doped Gd3Al2Ga3O12 (Ce:GAGG) cubic crystals measuring 3 x 3 x 3 mm(3) in size, separated by a layer of air. When the light signals output from both ends are read with the MPPCs, the position of each crystal is clearly distinguished with a spatial uncertainty of 0.48 +/- 0.03 mm. For 3-D measurements, we then fabricated three different type arrays: [A] 4 x 4 x 4 matrix of 3 x 3 x 3 mm(3) pixels, [B] 5 x 5 x 5 matrix of 2 x 2 x 2 mm(3) pixels, and [C] 10 x 10 x 10 matrix of 1 x 1 x 1 mm(3) pixels, with each pixel divided by a BaSO4 reflector in the 2-D direction and by a layer of air in the DOI direction. We demonstrated that the 3-D position of each Ce:GAGG pixel was clearly distinguished when illuminated by 662 keV gamma rays uniformly. Average energy resolutions of 9.8 +/- 0.8 %, 9.8 +/- 0.9 %, and 13.2 +/- 1.7 % were obtained for types A, B and C, respectively. These results suggest that our proposed method is simple and offers promise in achieving 1 mm 3-D spatial resolution for future medical imaging, particularly in positron emission tomography (PET).

  • The cosmic-ray and gas content of the Cygnus region as measured in γ-rays by the Fermi Large Area Telescope

    M. Ackermann, M. Ajello, A. Allafort, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, A. Belfiore, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, E. Bottacini, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, A. Chekhtman, S. Ciprini, R. Claus, J. Cohen-Tanugi, A. De Angelis, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, D. Dumora, C. Favuzzi, S. J. Fegan, W. B. Focke, P. Fortin, Y. Fukazawa, P. Fusco, F. Gargano, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, L. Guillemot, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, M. Hayashida, K. Hayashi, E. Hays, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, S. H. Lee, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, P. Martin, M. N. Mazziotta, J. E. McEnery, J. Mehault, P. F. Michelson, W. Mitthumsiri, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, D. Parent, M. Pesce-Rollins, M. Pierbattista, F. Piron

    Astronomy and Astrophysics   538  2012年

    　概要を見る

    Context. The Cygnus region hosts a giant molecular-cloud complex that actively forms massive stars. Interactions of cosmic rays with interstellar gas and radiation fields make it shine at γ-ray energies. Several γ-ray pulsars and other energetic sources are seen in this direction. Aims. In this paper we analyze the γ-ray emission measured by the Fermi Large Area Telescope (LAT) in the energy range from 100 MeV to 100 GeV in order to probe the gas and cosmic-ray content on the scale of the whole Cygnus complex. The γ-ray emission on the scale of the central massive stellar clusters and from individual sources is addressed elsewhere. Methods. The signal from bright pulsars is greatly reduced by selecting photons in their off-pulse phase intervals. We compare the diffuse γ-ray emission with interstellar gas maps derived from radio/mm-wave lines and visual extinction data. A general model of the region, including other pulsars and γ-ray sources, is sought. Results. The integral H i emissivity above 100 MeV averaged over the whole Cygnus complex amounts to [2.06 ± 0.11 (stat.) -0.84+0.15(syst.)] × 10 -26 photons s -1 sr -1 H-atom -1, where the systematic error is dominated by the uncertainty on the H i opacity to calculate its column densities. The integral emissivity and its spectral energy distribution are both consistent within the systematics with LAT measurements in the interstellar space near the solar system. The average X CO = N(H 2)/W CO ratio is found to be [1.68 ± 0.05 (stat.) -0.10+0.87(HI opacity)] × 10 20 molecules cm -2 (K km s -1) -1, consistent with other LAT measurements in the Local Arm. We detect significant γ-ray emission from dark neutral gas for a mass corresponding to ~40% of what is traced by CO. The total interstellar mass in the Cygnus complex inferred from its γ-ray emission amounts to 8 -1+5 × 10 6 M ⊙ at a distance of 1.4 kpc. Conclusions. Despite the conspicuous star formation activity and high masses of the interstellar clouds, the cosmic-ray population in the Cygnus complex averaged over a few hundred parsecs is similar to that of the local interstellar space. © 2012 ESO.

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  • The ASTRO-H X-ray observatory

    Tadayuki Takahashi, Kazuhisa Mitsuda, Richard Kelley, Henri Aarts, Felix Aharonian, Hiroki Akamatsu, Fumie Akimotoe, Steve Allen, Naohisa Anabuki, Lorella Angelini, Keith Arnaud, Makoto Asai, Marc Audard, Hisamitsu Awaki, Philipp Azzarello, Chris Baluta, Aya Bamba, Nobutaka Bando, Mark Bautz, Roger Blandford, Kevin Boyce, Greg Brown, Ed Cackett, Maria Chernyakova, Paolo Coppi, Elisa Costantini, Jelle De Plaa, Jan Willem Den Herder, Michael DiPirro, Chris Done, Tadayasu Dotani, John Doty, Ken Ebisawa, Megan Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew Fabian, Carlo Ferrigno, Adam Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Stefan Funk, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi Gallo, Poshak Gandhi, Keith Gendreau, Kirk Gilmore, Daniel Haas, Yoshito Haba, Kenji Hamaguchi, Isamu Hatsukade, Takayuki Hayashi, Kiyoshi Hayashida, Junko Hiraga, Kazuyuki Hirose, Ann Hornschemeier, Akio Hoshino, John Hughes, Una Hwang, Ryo Iizuka, Yoshiyuki Inoue, Kazunori Ishibashi, Manabu Ishida, Kosei Ishimura, Yoshitaka Ishisaki, Masayuki Ito, Naoko Iwat, Naoko Iyomoto, Jelle Kaastr, Timothy Kallman, Tuneyoshi Kamae, Jun Kataoka, Satoru Katsuda, Hajime Kawahara, Madoka Kawaharada, Nobuyuki Kawai, Shigeo Kawasaki, Dmitry Khangaluyan, Caroline Kilbourne, Masashi Kimura, Kenzo Kinugasaa, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, Motohide Kokubun, Tatsuro Kosaka, Alex Koujelev, Katsuji Koyama, Hans Krimm, Aya Kubota, Hideyo Kunieda, Stephanie LaMass, Philippe Laurent, Francois Lebrun, Maurice Leutenegger, Olivier Limousin, Michael Loewenstein, Knox Long, David Lumb

    Proceedings of SPIE - The International Society for Optical Engineering   8443  2012年

    　概要を見る

    The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by the Institute of Space and Astronautical Science (ISAS). ASTRO-H will investigate the physics of the highenergy universe via a suite of four instruments, covering a very wide energy range, from 0.3 keV to 600 keV. These instruments include a high-resolution, high-Throughput spectrometer sensitive over 0.3-12 keV with high spectral resolution of ?E 5 7 eV, enabled by a micro-calorimeter array located in the focal plane of thin-foil X-ray optics; hard X-ray imaging spectrometers covering 5-80 keV, located in the focal plane of multilayer-coated, focusing hard X-ray mirrors; a wide-field imaging spectrometer sensitive over 0.4-12 keV, with an X-ray CCD camera in the focal plane of a soft X-ray telescope; and a non-focusing Compton-camera type soft gamma-ray detector, sensitive in the 40-600 keV band. The simultaneous broad bandpass, coupled with high spectral resolution, will enable the pursuit of a wide variety of important science themes. © 2012 SPIE.

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  • Γ-ray emission from the Perseus cluster of galaxies observed with the MAGIC telescopes

    P. Colin, D. Eisenacher, D. Hildebrand, S. Lombardi, E. Lindfors, D. Paneque, S. Partini, F. Prada, J. Sitarek, F. Zandanel, Magic Collaboration, T. Dauser, M. Kadler, F. Krauss, J. Kataoka, C. Pfrommer, A. Pinzke, Y. Takahashi, S. Wilbert, J. Wilms

    AIP Conference Proceedings   1505   578 - 581  2012年

    　概要を見る

    The Perseus cluster of galaxies is a nearby cool-core cluster with an intra-clustermedium (ICM) characterized by very high central densities. The observation of the Perseus cluster with the MAGIC telescopes, during 85 h from 2009 to 2011, resulted in the discovery of 2 point-like sources at very high energy (>100 GeV, VHE) coinciding with the central radio galaxy NGC1275 and the radio galaxy IC310. The γ-ray properties of these 2 sources are presented, taking into account contemporaneous Fermi-LAT as well as multi-wavelength data. Flux variability and spectral energy distribution shapes indicate that the VHE γ-rays do not originate from large-scale interaction of the radio galaxies with ICM but more likely from the active nuclei of these two galaxies. They could be both misaligned version of BL Lac objects, the most common TeV AGN. Our results provide vital clues to understand emission mechanisms of such misaligned objects, and how they may be related to the beamed emission seen in BL Lacs. No evidence of large-scale VHE γ-ray emission from hadronic cosmic ray (CR) interactions with the ICM has been found. The flux upper limit above 1 TeV reaches the signal expected by some theoretical models, constraining the cluster CR physics. In the framework of the hadronicmodel of the radiomini-halos, this limit implies aminimal magnetic field ranging from 4-9μG for the central cluster region. © 2012 American Institute of Physics.

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  • Sub-geiger mode single-photon detector using a low-darkcurrent InGaAs avalanche photodiode

    Yoshito Miyamoto, Kenji Tsujino, Jun Kataoka, Akihisa Tomita

    European Conference on Optical Communication, ECOC    2012年

    　概要を見る

    We have developed a single-photon detector that uses an InGaAs avalanche photodiode (APD) operating in sub-Geiger mode. Sub-Geiger mode operation is a technique in which an APD is operated at a bias voltage that is lower than the breakdown voltage. This mode considerably reduces afterpulse probability, and single photons that arrive randomly can be detected. In the present study, we reduced the dark count rate of the sub-Geiger mode single-photon detector by using a low-darkcurrent InGaAs APD. Consequently, we obtained a dark count rate (DCR) of 5.6 counts per second (cps) with single-photon detection efficiency (SPDE) of 0.2%. Our single-photon detector is comparable in DCR to that of superconducting nanowire single-photon detectors. © 2012 OSA.

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  • In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope

    Ackermann M, Ajello M, Allafort A, Atwood W. B, Axelsson M, Baldini L, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Cutini S, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Dubois R, Enoto T, Falletti L, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grove J. E, Guiriec S, Hadasch D, Hayashida M, Hays E, Hughes R. E, Johannesson G, Johnson A. S, Johnson T. J, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Longo F, Loparco F, Lovellette M. N, Lubrano P, Madejski G. M, Mazziotta M. N, McEnery J. E, Michelson P. F, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pesce-Rollins M, Pierbattista M, Piron F, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Ritz S, Rochester L. S, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Suson D. J, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tosti G, Troja E, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vilchez N, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Zimmer S

    ASTROPARTICLE PHYSICS   35 ( 6 ) 346 - 353  2012年01月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT G8.7-0.1

    Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Ciprini S, Claus R, Cohen-Tanugi J, Cutini S, de Angelis A, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Dubois R, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Frailis M, Fukazawa Y, Fukui Y, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grove J. E, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashi K, Hays E, Itoh R, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kubo H, Kuss M, Lande J, Latronico L, Lee S. -H, Lionetto A. M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Mazziotta M. N, Mehault J, Michelson P. F, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nishino S, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Paneque D, Parent D, Pelassa V, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Rando R, Reimer A, Reimer O, Reposeur T, Roth M, Sadrozinski H. F. -W, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Suson D. J, Tajima H, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Troja E, Uchiyama Y, Uehara T, Usher T. L, Vandenbroucke J, Van Etten A, Vasileiou V, Vianello G, Vilchez N, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yamamoto H, Yamazaki R, Yang Z, Yasuda H, Ziegler M, Zimmer S

    ASTROPHYSICAL JOURNAL   744 ( 1 )  2012年01月  [査読有り]

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  • Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope

    M. Ackermann, M. Ajello, A. Allafort, W.B. Atwood, L. Baldini, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R.D. Blandford, E.D. Bloom, E. Bonamente, A.W. Borgland, A. Bouvier, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G.A. Caliandro, R.A. Cameron, P.A. Caraveo, J.M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, C.C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, A. De Angelis, F. De Palma, C.D. Dermer, S.W. Digel, E. Do Couto E Silva, P.S. Drell, A. Drlica-Wagner, C. Favuzzi, S.J. Fegan, E.C. Ferrara, W.B. Focke, P. Fortin, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I.A. Grenier, J.E. Grove, S. Guiriec, M. Gustafsson, D. Hadasch, A.K. Harding, M. Hayashida, R.E. Hughes, G. Jóhannesson, A.S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, M. Lemoine-Goumard, M. Llena Garde, F. Longo, F. Loparco, M.N. Lovellette, P. Lubrano, G.M. Madejski, M.N. Mazziotta, J.E. McEnery, P.F. Michelson, W. Mitthumsiri, T. Mizuno, A.A. Moiseev, C. Monte, M.E. Monzani, A. Morselli, I.V. Moskalenko, S. Murgia, T. Nakamori, P.L. Nolan, J.P. Norris, E. Nuss, M. Ohno, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J.F. Ormes, M. Ozaki, D. Paneque, D. Parent, M. Pesce-Rollins, M. Pierbattista, F. Piron, G. Pivato, T.A. Porter, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, S. Ritz, R.W. Romani, M. Roth, H.F.-W. Sadrozinski, C. Sbarra, T.L. Schalk, C. Sgrò, E.J. Siskind, G. Spandre, P. Spinelli, A.W. Strong, H. Takahashi, T. Takahashi, T. Tanaka, J.G. Thayer, J.B. Thayer, L. Tibaldo, M. Tinivella, D.F. Torres, G. Tosti, E. Troja, Y. Uchiyama, T.L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A.P. Waite, B.L. Winer, K.S. Wood, M. Wood, Z. Yang, S. Zimmer

    Physical Review Letters   108 ( 1 )  2012年  [査読有り]

    　概要を見る

    We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 GeV. We confirm that the fraction rises with energy in the 20-100 GeV range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy. © 2012 American Physical Society.

    DOI

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    563
    被引用数
    (Scopus)

  • Soft Gamma-ray Detector for the ASTRO-H mission

    Watanabe Shin, Talima Hiroyasu, Fukazawa Yasushi, Blandford Roger, Enoto Teruaki, Kataoka Jun, Kawaharada Madoka, Kokubun Motohide, Laurent Philippe, Lebrun Francois, Limousin Olivier, Madejski Greg, Makishima Kazuo, Mizuno Tsunefumi, Nakamori Takeshi, Nakazawa Kazuhiro, Mori Kunishiro, Odaka Hirokazu, Ohno Masanori, Ohta Masayuki, Sato Goro, Sato Rie, Takeda Shin'ichiro, Takahashi Hiromitsu, Takahashi Tadayuki, Tanaka Takaaki, Tashiro Makoto, Terada Yukikatsu, Uchiyama Hideki, Uchiyama Yasunobu, Yamada Shinya, Yatsu Yoichi, Yonetoku Daisuke, Yuasa Takayuki

    SPACE TELESCOPES AND INSTRUMENTATION 2012: ULTRAVIOLET TO GAMMA RAY   8443  2012年  [査読有り]

    DOI

    Scopus

    34
    被引用数
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  • フェルミ・バブルから探る銀河系中心の過去の活動性

    片岡 淳, 戸谷 友則, 井岡 邦仁

    日本天文学会誌   105 ( 9 ) 542 - 553  2012年

    CiNii

  • THE SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE

    Ackermann M, Ajello M, Allafort A, Antolini E, Atwood W. B, Axelsson M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bottacini E, Bouvier A, Bregeon J, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cavazzuti E, Cecchi C, Charles E, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Costamante L, Cutini S, de Angelis A, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Escande L, Favuzzi C, Fegan S. J, Ferrara E. C, Finke J, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giebels B, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grove J. E, Guiriec S, Gustafsson M, Hadasch D, Hayashida M, Hays E, Healey S. E, Horan D, Hou X, Hughes R. E, Iafrate G, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knodlseder J, Kuss M, Lande J, Larsson S, Latronico L, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Mazziotta M. N, McConville W, McEnery J. E, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Moretti E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orienti M, Orlando E, Ormes J. F, Ozaki M, Paneque D, Parent D, Pesce-Rollins M, Pierbattista M, Piranomonte S, Piron F, Pivato G, Porter T. A, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Ritz S, Rochester L. S, Romani R. W, Roth M, Sanchez D. A, Sbarra C, Scargle J. D, Schalk T. L, Sgro C, Shaw M. S, Siskind E. J, Spandre G, Spinelli P, Strong A. W, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tinivella M, Torres D. F, Tosti G, Troja E, Uchiyama Y, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Wallace E, Wang P, Winer B. L, Wood D. L, Wood K. S, Zimmer S

    ASTROPHYSICAL JOURNAL   743 ( 2 )  2011年12月  [査読有り]

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    557
    被引用数
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  • Constraining dark matter models from a combined analysis of Milky Way satellites with the Fermi Large Area Telescope

    M. Ackermann, M. Ajello, A. Albert, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, B. Cañadas, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, L. Falletti, C. Favuzzi, S. J. Fegan, E. C. Ferrara, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, S. Guiriec, M. Gustafsson, D. Hadasch, M. Hayashida, E. Hays, R. E. Hughes, T. E. Jeltema, G. Jóhannesson, R. P. Johnson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, A. M. Lionetto, M. Llena Garde, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, M. N. Mazziotta, J. E. McEnery, J. Mehault, P. F. Michelson, W. Mitthumsiri, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura

    Physical Review Letters   107 ( 24 )  2011年12月

    　概要を見る

    Satellite galaxies of the Milky Way are among the most promising targets for dark matter searches in gamma rays. We present a search for dark matter consisting of weakly interacting massive particles, applying a joint likelihood analysis to 10 satellite galaxies with 24 months of data of the Fermi Large Area Telescope. No dark matter signal is detected. Including the uncertainty in the dark matter distribution, robust upper limits are placed on dark matter annihilation cross sections. The 95% confidence level upper limits range from about 10-26cmm3s-1 at 5 GeV to about 5×10-23cm3s-1 at 1 TeV, depending on the dark matter annihilation final state. For the first time, using gamma rays, we are able to rule out models with the most generic cross section (∼3×10-26cm3s-1 for a purely s-wave cross section), without assuming additional boost factors. © 2011 American Physical Society.

    DOI

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    519
    被引用数
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  • シンポジウム「二次元放射線検出器の最前線」開催への思い

    片岡 淳

    放射線   37 ( 4 ) 215 - 215  2011年12月

    CiNii

  • Gas slit camera (GSC) onboard MAXI on ISS

    Tatehiro Mihara, Motoki Nakajima, Mutsumi Sugizaki, Motoko Serino, Masaru Matsuoka, Mitsuhiro Kohama, Kazuyoshi Kawasaki, Hiroshi Tomida, Shiro Ueno, Nobuyuki Kawai, Jun Kataoka, Mikio Morii, Atsumasa Yoshida, Kazutaka Yamaoka, Satoshi Nakahira, Hitoshi Negoro, Naoki Isobe, Makoto Yamauchi, Ikuya Sakurai

    Publications of the Astronomical Society of Japan   63 ( SPEC. ISSUE 3 )  2011年11月

    　概要を見る

    The Gas Slit Camera (GSC) is an X-ray instrument on the MAXI (Monitor of All-sky X-ray Image) mission aboard the International Space Station. It is designed to scan the entire sky every 92-minute orbital period in the 2-30 keV band and to achieve the highest sensitivity among the X-ray all-sky monitors ever flown so far. The GSC employs large-area position-sensitive proportional counterswith a total detector area of 5350cm2. The on-board data processor has functions to format telemetry data as well as to control the high voltage of the proportional counters so as to protect them from particle irradiation. This paper describes the instruments, on-board data processing, telemetry data formats, and performance specifications expected from ground calibration tests. © 2011. Astronomical Society of Japan.

    DOI

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    147
    被引用数
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  • A Cocoon of Freshly Accelerated Cosmic Rays Detected by Fermi in the Cygnus Superbubble

    Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Belfiore A, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bottacini E, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, de Angelis A, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Dumora D, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Fukazawa Y, Fusco P, Gargano F, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Guillemot L, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hayashi K, Hays E, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Martin P, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mitthumsiri W, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Orlando E, Ormes J. F, Ozaki M, Paneque D, Parent D, Pesce-Rollins M, Pierbattista M, Piron F, Pohl M, Prokhorov D, Raino S, Rando R, Razzano M, Reposeur T, Ritz S, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith P. D, Spinelli P, Strong A. W, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Troja E, Uchiyama Y, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Zimmer S, Bontemps S

    SCIENCE   334 ( 6059 ) 1103 - 1107  2011年11月  [査読有り]

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    268
    被引用数
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  • Fermi Detection of a Luminous gamma-Ray Pulsar in a Globular Cluster

    SCIENCE   334 ( 6059 ) 1107 - 1110  2011年11月  [査読有り]

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    69
    被引用数
    (Scopus)

  • γ -Ray and parsec-scale jet properties of a complete sample of blazars from the mojave program

    M. L. Lister, M. Aller, H. Aller, T. Hovatta, K. I. Kellermann, Y. Y. Kovalev, E. T. Meyer, A. B. Pushkarev, E. Ros, M. Ackermann, E. Antolini, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, M. Boeck, E. Bonamente, A. W. Borgland, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, C. S. Chang, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, C. Favuzzi, S. J. Fegan, E. C. Ferrara, J. Finke, W. B. Focke, P. Fortin, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, S. Guiriec, D. Hadasch, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, G. Jóhannesson, A. S. Johnson, M. Kadler, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, M. N. Mazziotta, W. McConville, J. E. McEnery, J. Mehault, P. F. Michelson, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, S. Nishino

    Astrophysical Journal   742 ( 1 )  2011年11月

    　概要を見る

    We investigate the Fermi Large Area Telescope γ -ray and 15 GHz Very Long Baseline Array radio properties of a joint γ -ray and radio-selected sample of active galactic nuclei (AGNs) obtained during the first 11 months of the Fermi mission (2008 August 4-2009 July 5). Our sample contains the brightest 173 AGNs in these bands above declination -30° during this period, and thus probes the full range of γ -ray loudness (γ -ray to radio band luminosity ratio) in the bright blazar population. The latter quantity spans at least 4 orders of magnitude, reflecting a wide range of spectral energy distribution (SED) parameters in the bright blazar population. The BL Lac objects, however, display a linear correlation of increasing γ -ray loudness with synchrotron SED peak frequency, suggesting a universal SED shape for objects of this class. The synchrotron self-Compton model is favored for the γ -ray emission in these BL Lac objects over external seed photon models, since the latter predict a dependence of Compton dominance on Doppler factor that would destroy any observed synchrotron SED-peak-γ -ray-loudness correlation. The high-synchrotron peaked (HSP) BL Lac objects are distinguished by lower than average radio core brightness temperatures, and none display large radio modulation indices or high linear core polarization levels. No equivalent trends are seen for the flat-spectrum radio quasars (FSRQs) in our sample. Given the association of such properties with relativistic beaming, we suggest that the HSP BL Lac objects have generally lower Doppler factors than the lower-synchrotron peaked BL Lac objects or FSRQs in our sample.

    DOI

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    107
    被引用数
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  • THE RADIO/GAMMA-RAY CONNECTION IN ACTIVE GALACTIC NUCLEI IN THE ERA OF THE FERMI LARGE AREA TELESCOPE

    Ackermann M, Ajello M, Allafort A, Angelakis E, Axelsson M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Cannon A, Caraveo P. A, Casandjian J. M, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Cheung C. C, Ciprini S, Claus R, Cohen-Tanugi J, Cutini S, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Escande L, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Frailis M, Fuhrmann L, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grandi P, Grenier I. A, Guiriec S, Hadasch D, Hayashida M, Hays E, Healey S. E, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Lee S. -H, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Max-Moerbeck W, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nishino S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Pavlidou V, Pelassa V, Pepe M, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Razzano M, Readhead A, Reimer A, Reimer O, Richards J. L, Romani R. W, Sadrozinski H. F. -W, Scargle J. D, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Tanaka T, Taylor G. B, Thayer J. G, Thayer J. B, Thompson D. J, Torres D. F, Tosti G, Tramacere A, Troja E, Vandenbroucke J, Vianello G, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ziegler M

    ASTROPHYSICAL JOURNAL   741 ( 1 )  2011年11月  [査読有り]

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    124
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  • Broad-line radio galaxies observed with fermi-lat: The origin of the GeV γ-ray emission

    Kataoka, J, Stawarz, Stawarz, Takahashi, Y, Cheung, C. C, Cheung, C. C, Hayashida, M, Grandi, P, Burnett, T. H, Celotti, A, Fegan, S. J, Fortin, P, Maeda, K, Nakamori, T, Taylor, G. B, Tosti, G, Tosti, G, Digel, S. W, McConville, W, McConville, W, Finke, J, D'Ammando, F, D'Ammando, F

    Astrophysical Journal   740 ( 1 )  2011年10月

    　概要を見る

    We report on a detailed investigation of the γ-ray emission from 18 broad-line radio galaxies (BLRGs) based on two years of Fermi Large Area Telescope data. We confirm the previously reported detections of 3C 120 and 3C 111 in the GeV photon energy range; a detailed look at the temporal characteristics of the observed γ-ray emission reveals in addition possible flux variability in both sources. No statistically significant γ-ray detection of the other BLRGs was found, however, in the considered data set. Though the sample size studied is small, what appears to differentiate 3C 111 and 3C 120 from the BLRGs not yet detected in γ-rays is the particularly strong nuclear radio flux. This finding, together with the indications of the γ-ray flux variability and a number of other arguments presented, indicates that the GeV emission of BLRGs is most likely dominated by the beamed radiation of relativistic jets observed at intermediate viewing angles. In this paper we also analyzed a comparison sample of high-accretion-rate Seyfert 1 galaxies, which can be considered radio-quiet counterparts of BLRGs, and found that none were detected in γ-rays. A simple phenomenological hybrid model

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    74
    被引用数
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  • フェルミ衛星による広輝線電波銀河の観測：GeVガンマ線放射の起源

    J.Kataoka

    The Astrophysical Journal   740 ( 1 ) 29 - 44  2011年10月  [査読有り]

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    74
    被引用数
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  • Development micro-satellite TSUBAME for polarimetry of gamma-ray bursts

    Yatsu, Y, Enomoto, T, Kawakami, K, Tokoyoda, K, Toizumi, T, Kawai, N, Ishizaka, K, Matsunaga, S, Nakamori, T, Kataoka, J, Kubo, S

    Proc. of SPIE   8145   814508  2011年09月

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    4
    被引用数
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  • Improvement of Energy Thresholds for Scintillation Detectors Using a Monolithic 2 x 2 Multi-Pixel Photon Counter Array with a Coincidence Technique

    Takamasa Miura, Takeshi Nakamori, Jun Kataoka, Takuya Kato, Kenichi Sato, Yoshitaka Ishikawa, Kazuhisa Yamamura, Nobuyuki Kawabata

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 9 )  2011年09月

    　概要を見る

    The performance of a large-area, monolithic Hamamatsu multi-pixel photon counter (MPPC) was tested consisting of a 2 x 2 array of 3 x 3 mm(2) pixels. MPPC is a novel type of semiconductor photodetector comprising multiple avalanche photodiode (APD) pixels operated in Geiger mode. Despite its great advantage of signal multiplication comparable to that achieved with the photomultiplier tube (PMT), the detection of weak scintillation light signals is quite difficult due to the severe contamination of dark counts, which typically amounts to similar or equal to 1 Mcps/3 x 3 mm(2) at room temperature. In this study, a coincidence technique was applied for scintillation detectors to improve the detection efficiency for low energy gamma-rays. The detector consisted of a 10 x 10 x 10 mm(3) crystals of GSO, BGO, and Pr:LuAG optically coupled with the 2 x 2 MPPC-array. With this technique, we demonstrated that the contamination of dark counts was reduced with a rejection efficiency of more than 99.8%. As a result, 22.2 keV gamma-rays were successfully detected with a GSO scintillator as measured at +20 degrees C.

    DOI

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  • Improvement of Energy Thresholds for Scintillation Detectors Using a Monolithic 2 x 2 Multi-Pixel Photon Counter Array with a Coincidence Technique

    Takamasa Miura, Takeshi Nakamori, Jun Kataoka, Takuya Kato, Kenichi Sato, Yoshitaka Ishikawa, Kazuhisa Yamamura, Nobuyuki Kawabata

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 9 ) 094203  2011年09月  [査読有り]

    　概要を見る

    The performance of a large-area, monolithic Hamamatsu multi-pixel photon counter (MPPC) was tested consisting of a 2 x 2 array of 3 x 3 mm(2) pixels. MPPC is a novel type of semiconductor photodetector comprising multiple avalanche photodiode (APD) pixels operated in Geiger mode. Despite its great advantage of signal multiplication comparable to that achieved with the photomultiplier tube (PMT), the detection of weak scintillation light signals is quite difficult due to the severe contamination of dark counts, which typically amounts to similar or equal to 1 Mcps/3 x 3 mm(2) at room temperature. In this study, a coincidence technique was applied for scintillation detectors to improve the detection efficiency for low energy gamma-rays. The detector consisted of a 10 x 10 x 10 mm(3) crystals of GSO, BGO, and Pr:LuAG optically coupled with the 2 x 2 MPPC-array. With this technique, we demonstrated that the contamination of dark counts was reduced with a rejection efficiency of more than 99.8%. As a result, 22.2 keV gamma-rays were successfully detected with a GSO scintillator as measured at +20 degrees C.

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  • The Small Satellite ``Tsubame'' for Polarimetry of GRBs

    Toizumi, T, Kawakami, K, Tokoyoda, K, Enomoto, T, Yatsu, Y, Kawai, N, Nakamori, T, Kataoka, J, Kubo, S

    AIP Conference Proceedings   1357   355 - 357  2011年08月

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  • Constraints on dark matter models from a Fermi LAT search for high-energy cosmic-ray electrons from the Sun

    M. Ajello, W. B. Atwood, L. Baldini, G. Barbiellini, D. Bastieri, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, E. Bottacini, A. Bouvier, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, C. Cecchi, E. Charles, A. Chekhtman, S. Ciprini, R. Claus, J. Cohen-Tanugi, S. Cutini, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, C. Favuzzi, S. J. Fegan, W. B. Focke, Y. Fukazawa, P. Fusco, F. Gargano, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, S. Guiriec, M. Gustafsson, D. Hadasch, G. Iafrate, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kuss, L. Latronico, A. M. Lionetto, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, J. P. Norris, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, J. H. Panetta, M. Pesce-Rollins, M. Pierbattista, F. Piron, S. Rainò, R. Rando, M. Razzano, A. Reimer, O. Reimer, S. Ritz, T. L. Schalk, C. Sgrò, J. Siegal-Gaskins, E. J. Siskind, P. D. Smith, G. Spandre, P. Spinelli, D. J. Suson

    Physical Review D - Particles, Fields, Gravitation and Cosmology   84 ( 3 )  2011年08月

    　概要を見る

    During its first year of data taking, the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope has collected a large sample of high-energy cosmic-ray electrons and positrons (CREs). We present the results of a directional analysis of the CRE events, in which we searched for a flux excess correlated with the direction of the Sun. Two different and complementary analysis approaches were implemented, and neither yielded evidence of a significant CRE flux excess from the Sun. We derive upper limits on the CRE flux from the Sun's direction, and use these bounds to constrain two classes of dark matter models which predict a solar CRE flux: (1) models in which dark matter annihilates to CREs via a light intermediate state, and (2) inelastic dark matter models in which dark matter annihilates to CREs. © 2011 American Physical Society.

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  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF MARKARIAN 421: THE MISSING PIECE OF ITS SPECTRAL ENERGY DISTRIBUTION

    ASTROPHYSICAL JOURNAL   736 ( 2 )  2011年08月  [査読有り]

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  • The Small Satellite ``Tsubame'' for Polarimetry of GRBs

    Toizumi, T, Kawakami, K, Tokoyoda, K, Enomoto, T, Yatsu, Y, Kawai, N, Nakamori, T, Kataoka, J, Kubo, S

    AIP Conference Proceedings   1358   435 - 437  2011年08月

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  • Discovery of high-energy gamma-ray emission from the binary system PSR B1259-63/LS 2883 around periastron with Fermi

    A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. Bonamente, A. W. Borgland, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, F. Camilo, P. A. Caraveo, C. Cecchi, E. Charles, S. Chaty, A. Chekhtman, M. Chernyakova, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, L. R. Cominsky, S. Corbel, S. Cutini, F. D'Ammando, A. De Angelis, P. R. Den Hartog, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, M. Dormody, P. S. Drell, A. Drlica-Wagner, R. Dubois, G. Dubus, D. Dumora, T. Enoto, C. M. Espinoza, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, P. Fortin, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, E. Grundstrom, S. Guiriec, C. Gwon, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, G. Jóhannesson, A. S. Johnson, T. J. Johnson, S. Johnston, T. Kamae, H. Katagiri, J. Kataoka, M. Keith, M. Kerr, J. Knödlseder, M. Kramer, M. Kuss, J. Lande, S. H. Lee, M. Lemoine-Goumard, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, R. N. Manchester, M. Marelli, M. N. Mazziotta

    Astrophysical Journal Letters   736 ( 1 )  2011年07月

    　概要を見る

    We report on the discovery of ≥100MeV γ-rays from the binary system PSR B1259-63/LS 2883 using the Large Area Telescope (LAT) on board Fermi. The system comprises a radio pulsar in orbit around a Be star. We report on LAT observations from near apastron to ∼128 days after the time of periastron, ∼tp , on 2010 December 15. No γ-ray emission was detected from this source when it was far from periastron. Faint γ-ray emission appeared as the pulsar approached periastron. At ∼tp + 30 days, the ≥100MeV γ-ray flux increased over a period of a few days to a peak flux 20-30 times that seen during the pre-periastron period, but with a softer spectrum. For the following month, it was seen to be variable on daily timescales, but remained at ∼(1-4) × 10-6 cm-2 s-1 before starting to fade at ∼tp + 57 days. The total γ-ray luminosity observed during this period is comparable to the spin-down power of the pulsar. Simultaneous radio and X-ray observations of the source showed no corresponding dramatic changes in radio and X-ray flux between the pre-periastron and post-periastron flares. We discuss possible explanations for the observed γ-ray-only flaring of the source. © 2011. The American Astronomical Society. All rights reserved.

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  • The development and performance of UV-enhanced APD-arrays for high resolution PET imaging coupled with pixelized Pr: LuAG crystal

    Yoshino, M, Kataoka, J, Nakamori, T, Matsuda, H, Miura, T, Katou, T, Ishikawa, Y, Kawabata, N, Matsunaga, Y, Kamada, K, Usuki, Y, Yoshikawa, A, Yanagida, T

    Nuclear Instruments and Methods in Physics Research Section A   643 ( 1 ) 57 - 63  2011年07月  [査読有り]

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  • DETECTION OF HIGH-ENERGY GAMMA-RAY EMISSION DURING THE X-RAY FLARING ACTIVITY IN GRB 100728A

    Abdo A. A, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bhat P. N, Bissaldi E, Blandford R. D, Bonamente E, Bonnell J, Borgland A. W, Bouvier A, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Connaughton V, Conrad J, Cutini S, de Angelis A, de Palma F, Dermer C. D, do Couto e, Silva E, Drell P. S, Dubois R, Favuzzi C, Fukazawa Y, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Granot J, Grenier I. A, Guiriec S, Hadasch D, Hanabata Y, Hughes R. E, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Longo F, Loparco F, Lott B, Lubrano P, Mazziotta M. N, McEnery J. E, Meszaros P, Michelson P. F, Mizuno T, Moiseev A. A, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Paciesas W. S, Pelassa V, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Racusin J. L, Raino S, Razzano M, Razzaque S, Reimer A, Reimer O, Reyes L. C, Roth M, Sadrozinski H. F. -W, Sgro C, Siskind E. J, Smith P. D, Sonbas E, Spandre G, Spinelli P, Stamatikos M, Strickman M. S, Takahashi H, Tanaka T, Tanaka Y, Thayer J. G, Thayer J. B, Torres D. F, Tosti G, Troja E, Uehara T, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vilchez N, Vitale V, von Kienlin A, Waite A. P, Wang P, Winer B. L, Wood K. S, Yamazaki R, Yang Z, Ziegler M, Piro L

    ASTROPHYSICAL JOURNAL LETTERS   734 ( 2 )  2011年06月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF TWO GAMMA-RAY EMISSION COMPONENTS FROM THE QUIESCENT SUN

    Abdo A. A, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, de Angelis A, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Frailis M, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grillo L, Guiriec S, Hadasch D, Hays E, Hughes R. E, Iafrate G, Johannesson G, Johnson A. S, Johnson T. J, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lionetto A. M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Pelassa V, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Ritz S, Sadrozinski H. F. -W, Schalk T. L, Sgro C, Share G. H, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Strong A. W, Takahashi H, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Troja E, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vianello G, Vilchez N, Vitale V, Vladimirov A. E, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ziegler M

    ASTROPHYSICAL JOURNAL   734 ( 2 )  2011年06月  [査読有り]

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  • OBSERVATIONS OF THE YOUNG SUPERNOVA REMNANT RX J1713.7-3946 WITH THE FERMI LARGE AREA TELESCOPE

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Chaty S, Chekhtman A, Cheung C. C, Chiang J, Cillis A. N, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Corbel S, Cutini S, de Angelis A, de Palma F, Dermer C. D, Digel S. W, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Dubois R, Dumora D, Favuzzi C, Ferrara E. C, Fortin P, Frailis M, Fukazawa Y, Fukui Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hayashi K, Hays E, Horan D, Jackson M. S, Johannesson G, Johnson A. S, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Mazziotta M. N, McEnery J. E, Michelson P. F, Mignani R. P, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Orlando E, Ormes J. F, Paneque D, Parent D, Pelassa V, Pesce-Rollins M, Pierbattista M, Piron F, Pohl M, Porter T. A, Raino S, Rando R, Razzano M, Reimer O, Reposeur T, Ritz S, Romani R. W, Roth M, Sadrozinski H. F. -W, Parkinson P, M. Saz, Sgro C, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. G, Thayer J. B, Thompson D. J, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Troja E, Uchiyama Y, Vandenbroucke J, Vasileiou V, Vianello G, Vilchez N, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yamamoto H, Yamazaki R, Yang Z, Ziegler M

    ASTROPHYSICAL JOURNAL   734 ( 1 )  2011年06月  [査読有り]

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  • Fermi gamma-ray space telescope observations of the gamma-ray outburst from 3C454.3 in November 2010

    A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, R. Dubois, D. Dumora, L. Escande, C. Favuzzi, S. J. Fegan, E. C. Ferrara, P. Fortin, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, S. Guiriec, D. Hadasch, M. Hayashida, E. Hays, D. Horan, R. Itoh, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, S. Larsson, L. Latronico, S. H. Lee, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, A. Makeev, M. N. Mazziotta, W. McConville, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, S. Nishino

    Astrophysical Journal Letters   733 ( 2 PART 2 )  2011年06月

    　概要を見る

    The flat-spectrum radio quasar 3C454.3 underwent an extraordinary 5 day γ-ray outburst in 2010 November when the daily flux measured with the Fermi Large Area Telescope (LAT) at photon energies E > 100MeV reached (66 2) × 10-6 photons cm-2 s-1. This is a factor of three higher than its previous maximum flux recorded in 2009 December and ≳ 5 times brighter than the Vela pulsar, which is normally the brightest source in the γ-ray sky. The 3hr peak flux was (85 5)×10-6 photons cm-2 s-1, corresponding to an apparent isotropic luminosity of (2.1 0.2)×1050 erg s-1, the highest ever recorded for a blazar. In this Letter, we investigate the features of this exceptional event in the γ-ray band of the Fermi-LAT. In contrast to previous flares of the same source observed with the Fermi-LAT, clear spectral changes are observed during the flare. © 2011. The American Astronomical Society. All rights reserved.

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  • Development of a large-area monolithic 4 x 4 MPPC array for a future PET scanner employing pixelized Ce:LYSO and Pr:LuAG crystals

    T. Kato, J. Kataoka, T. Nakamori, T. Miura, H. Matsuda, K. Sato, Y. Ishikawa, K. Yamamura, N. Kawabata, H. Ikeda, G. Sato, K. Kamada

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   638 ( 1 ) 83 - 91  2011年05月  [査読有り]

    　概要を見る

    We have developed a new type of large-area monolithic Multi-Pixel Photon Counter (MPPC) array consisting of a 4 x 4 matrix of 3 x 3 mm(2) pixels. Each pixel comprises 3600 Geiger mode avalanche photodiodes (APDs) that achieve an average gain of 9.68 x 10(5) at 71.9 V at 0 degrees C with variations of only +/- 7.2% over 4 x 4 pixels. Excellent uniformity was also obtained for photon detection efficiencies (PDE) of +/- 6.4%, whilst dark count rates at the single photoelectron (1 p.e.) level amounted to similar or equal to 2 Mcps/pixel, measured at 0 degrees C. As the first step toward using the device in scintillation photon detectors, we fabricated a prototype gamma-ray camera consisting of an MPPC array optically coupled with a scintillator matrix, namely a 4 x 4 array of 3 x 3 x 10 mm(3) crystals. Specifically, we tested the performance with Ce-doped (Lu, Y)(2)(SiO(4))O (Ce:LYSO), Pr-doped Lu(3)Al(5)O(12) (Pr:LuAG) and "surface coated" Pr:LuAG (Pr:LuAG (WES)) matrices whereby the emission peak of Pr:LuAG was shifted from 310 to 420 nm via a wavelength shifter (WLS). Average energy resolutions of 13.83%, 14.70% and 13.96% (FWHM) were obtained for 662 keV gamma-rays, as measured at 0 degrees C with Ce:LYSO, Pr:LuAG and Pr:LuAG (WLS) scintillator matrices, respectively. We confirmed that the effective PDE for Pr:LuAG (WLS) had improved by more than 30% compared to original, non-coated Pr:LuAG matrix. These results suggest that a large-area monolithic MPPC array developed here could be promising for future medical imaging, particularly in positron emission tomography (PET). (C) 2011 Elsevier B.V. All rights reserved.

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  • MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER (vol 726, pg 43, 2011)

    ASTROPHYSICAL JOURNAL   731 ( 1 )  2011年04月  [査読有り]

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  • THE FIRST FERMI MULTIFREQUENCY CAMPAIGN ON BL LACERTAE: CHARACTERIZING THE LOW-ACTIVITY STATE OF THE EPONYMOUS BLAZAR

    Abdo A. A, Ackermann M, Ajello M, Antolini E, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Cannon A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Costamante L, Cutini S, Dermer C. D, de Palma F, Donato D, do Couto e, Silva E, Drell P. S, Dubois R, Escande L, Favuzzi C, Fegan S. J, Finke J, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Guiriec S, Hadasch D, Hayashida M, Hays E, Hughes R. E, Itoh R, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lee S. -H, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nishino S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Roth M, Sadrozinski H. F. -W, Sanchez D, Sander A, Schinzel F. K, Sgro C, Siskind E. J, Smith P. D, Sokolovsky K. V, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uehara T, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wallace E, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M, Berdyugin A, Boettcher M, Carraminana A, Carrasco L, de la Fuente E, Diltz C, Hovatta T, Kadenius V, Kovalev Y. Y, Lahteenmaki A, Lindfors E, Marscher A. P, Nilsson K, Pereira D, Reinthal R, Roustazadeh P, Savolainen T, Sillanpaa A, Takalo L. O, Tornikoski M

    ASTROPHYSICAL JOURNAL   730 ( 2 )  2011年04月  [査読有り]

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  • Searching for X-ray counterparts of Fermi Gamma-ray pulsars in Suzaku observations

    Aoki, Y, Enomoto, T, Yatsu, Y, Kawai, N, Nakamori, T, Kataoka, J, Saz Parkinson, P

    Proceedings of the International Astronomical Union   7 ( S279 ) 317 - 318  2011年04月

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  • DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A

    Ackermann M, Ajello M, Asano K, Axelsson M, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bhat P. N, Bissaldi E, Blandford R. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Briggs M. S, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik O, Chaplin V, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Connaughton V, Conrad J, Cutini S, Dermer C. D, De Angelis A, De Palma F, Dingus B. L, Silva E. Do Couto E, Drell P. S, Dubois R, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Goldstein A, Granot J, Greiner J, Grenier I. A, Grove J. E, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashi K, Hayashida M, Hays E, Horan D, Hughes R. E, Itoh R, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kippen R. M, Knoedlseder J, Kocevski D, Kouveliotou C, Kuss M, Lande J, Latronico L, Lee S. -H, Garde M. Llena, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McBreen S, McEnery J. E, McGlynn S, Meegan C, Mehault J, Meszaros P, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Moretti E, Morselli A, Moskalenko I. V, Murgia S, Nakajima H, Nakamori T, Naumann-Godo M, Nishino S, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paciesas W. S, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Petrosian V, Piron F, Porter T. A, Preece R, Racusin J. L, Raino S, Rando R, Rau A, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Reyes L. C, Ripken J, Ritz S, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Scargle J. D, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Tanaka T, Tanaka Y, Thayer J. B, Thayer J. G, Tibaldo L, Tierney D, Toma K, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Uehara T, Usher T. L, Vandenbroucke J, van der Horst A. J, Vasileiou V, Vilchez N, Vitale V, von Kienlin A, Waite A. P, Wang P, Wilson-Hodge C, Winer B. L, Wood K. S, Wu X. F, Yamazaki R, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   729 ( 2 )  2011年03月  [査読有り]

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  • THE FIRST FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS (vol 187, pg 460, 2010)

    A. A. Abdo, M. Ackermann, M. Ajello, W. B. Atwood, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, B. M. Baughman, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, J. Bregeon, A. Brez, M. Brigida, P. Bruel, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, F. Camilo, P. A. Caraveo, J. M. Casandjian, C. Cecchi, Oe. Celik, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, I. Cognard, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, R. Corbet, S. Cutini, P. R. den Hartog, C. D. Dermer, A. de Angelis, A. de Luca, F. de Palma, S. W. Digel, M. Dormody, E. do Couto e Silva, P. S. Drell, R. Dubois, D. Dumora, C. Espinoza, C. Farnier, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, P. Fortin, M. Frailis, P. C. C. Freire, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, G. Giavitto, B. Giebels, N. Giglietto, P. Giommi, F. Giordano, T. Glanzman, G. Godfrey, E. V. Gotthelf, I. A. Grenier, M. -H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, C. Gwon, Y. Hanabata, A. K. Harding, M. Hayashida, E. Hays, R. E. Hughes, M. S. Jackson, G. Johannesson, A. S. Johnson, R. P. Johnson, T. J. Johnson, W. N. Johnson, S. Johnston, T. Kamae, G. Kanbach, V. M. Kaspi, H. Katagiri, J. Kataoka, N. Kawai, M. Kerr, J. Knoedlseder, M. L. Kocian, M. Kramer, M. Kuss, J. Lande, L. Latronico, M. Lemoine-Goumard, M. Livingstone, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. G. Lyne, G. M. Madejski, A. Makeev, R. N. Manchester, M. Marelli, M. N. Mazziotta, W. McConville, J. E. McEnery, S. McGlynn, C. Meurer, P. F. Michelson, T. Mineo, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, P. L. Nolan, J. P. Norris, A. Noutsos, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, J. H. Panetta, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, F. Piron, T. A. Porter, S. Raino, R. Rando, S. M. Ransom, P. S. Ray, M. Razzano, N. Rea, A. Reimer, O. Reimer, T. Reposeur, S. Ritz, A. Y. Rodriguez, R. W. Romani, M. Roth, F. Ryde, H. F. -W. Sadrozinski, D. Sanchez, A. Sander, P. M. Saz Parkinson, J. D. Scargle, T. L. Schalk, A. Sellerholm, C. Sgro, E. J. Siskind, D. A. Smith, P. D. Smith, G. Spandre, P. Spinelli, B. W. Stappers, J. -L. Starck, E. Striani, M. S. Strickman, A. W. Strong, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, G. Theureau, D. J. Thompson, S. E. Thorsett, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, A. Tramacere, Y. Uchiyama, T. L. Usher, A. Van Etten, V. Vasileiou, C. Venter, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, N. Wang, K. Watters, P. Weltevrede, B. L. Winer, K. S. Wood, T. Ylinen, M. Ziegler

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   193 ( 1 ) 460 - 494  2011年03月  [査読有り]

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    5
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  • 27pGS-11 ASTRO-H衛星硬X線・軟ガンマ線検出器アクティブシールドの構造設計(27pGS X線(ASTRO-Hなど),宇宙線・宇宙物理領域)

    中島 健太, 中野 俊男, 中澤 知洋, 牧島 一夫, 花畑 義隆, 深沢 泰司, 山岡 和貴, 田島 宏康, 片岡 淳, 高橋 弘充, 水野 恒史, 大野 雅功, 国分 紀秀, 高橋 忠幸, 渡辺 伸, 田代 信, 寺田 幸功, HXI, SGDチーム

    日本物理学会講演概要集   66 ( 1 ) 122 - 122  2011年03月

    CiNii

  • 28aGP-6 APD/MPPCを用いた高解像度γ線イメージセンサー(28aGP 素粒子実験領域シンポジウム:先端的放射線検出器開発とその応用で拓かれる未来,素粒子実験領域)

    片岡 淳

    日本物理学会講演概要集   66 ( 1 ) 36 - 36  2011年03月

    CiNii

  • UNRAVELING THE NATURE OF UNIDENTIFIED HIGH GALACTIC LATITUDE FERMI/LAT GAMMA-RAY SOURCES WITH SUZAKU

    K. Maeda, J. Kataoka, T. Nakamori, L. Stawarz, R. Makiya, T. Totani, C. C. Cheung, D. Donato, N. Gehrels, P. Saz Parkinson, Y. Kanai, N. Kawai, Y. Tanaka, R. Sato, T. Takahashi, Y. Takahashi

    ASTROPHYSICAL JOURNAL   729 ( 2 ) 103 - 116  2011年03月  [査読有り]

    　概要を見る

    Here we report on the results of deep X-ray follow-up observations of four unidentified gamma-ray sources detected by the Fermi/LAT instrument at high Galactic latitudes using the X-ray Imaging Spectrometers on board the Suzaku satellite. All of the studied objects were detected with high significance during the first three months of Fermi/LAT operation and subsequently better localized in the first Fermi/LAT catalog (1FGL). For some of them, possible associations with pulsars and active galaxies have subsequently been discussed, and our observations provide an important contribution to this debate. In particular, a bright X-ray point source has been found within the 95% confidence error circle of 1FGL J1231.1-1410. The X-ray spectrum of the discovered Suzaku counterpart of 1FGL J1231.1-1410 is well fitted by a blackbody with an additional power-law component. This supports the recently claimed identification of this source with a millisecond pulsar PSR J1231-1411. For the remaining three Fermi objects, on the other hand, the X-ray observations performed are less conclusive. In the case of 1FGL J1311.7-3429, two bright X-ray point sources were found within the LAT 95% error circle. Even though the X-ray spectral and variability properties for these sources were robustly assessed, their physical nature and relationship with the gamma-ray source remain uncertain. Similarly, we found several weak X-ray sources in the field of 1FGL J1333.2+5056, one coinciding with the high-redshift blazar CLASS J1333+5057. We argue that the available data are consistent with the physical association between these two objects, although the large positional uncertainty of the gamma-ray source hinders a robust identification. Finally, we have detected an X-ray point source in the vicinity of 1FGL J2017.3+0603. This Fermi object was recently suggested to be associated with a newly discovered millisecond radio pulsar PSR J2017+0603, because of the spatial coincidence and the detection of the gamma-ray pulsations in the light curve of 1FGL J2017.3+0603. Interestingly, we have detected the X-ray counterpart of the high-redshift blazar CLASS J2017+0603, located within the error circle of the gamma-ray source, while we were only able to determine an X-ray flux upper limit at the pulsar position. All in all, our studies indicate that while a significant fraction of unidentified high Galactic latitude gamma-ray sources is related to the pulsar and blazar phenomena, associations with other classes of astrophysical objects are still valid options.

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  • RADIO AND gamma-RAY CONSTRAINTS ON THE EMISSION GEOMETRY AND BIRTHPLACE OF PSR J2043+2740

    Noutsos A, Abdo A. A, Ackermann M, Ajello M, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Busetto G, Caliandro G. A, Cameron R. A, Camilo F, Caraveo P. A, Casandjian J. M, Cecchi C, Celik Oe, Chaty S, Chekhtman A, Chiang J, Ciprini S, Claus R, Cognard I, Cohen-Tanugi J, Colafrancesco S, Cutini S, Dermer C. D, de Palma F, Drell P. S, Dumora D, Ea C. M, Favuzzi C, Ferrara E. C, Focke W. B, Frailis M, Freire P. C. C, Fukazawa Y, Funk S, Fusco P, Gargano F, Germani S, Giglietto N, Giordano F, Giroletti M, Godfrey G, Grandi P, Grenier I. A, Grove J. E, Guillemot L, Guiriec S, Harding A. K, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Johnston S, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kramer M, Kuss M, Lande J, Lee S-H, Longo F, Loparco F, Lovellette M. N, Lubrano P, Lyne A. G, Makeev A, Marelli M, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nolan P. L, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Panetta J. H, Parent D, Pelassa V, Pepe M, Persic M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Ray P. S, Razzano M, Reimer A, Reimer O, Reposeur T, Romani R. W, Sadrozinski H. F-W, Sander A, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Stappers B. W, Strickman M. S, Suson D. J, Takahashi H, Tanaka T, Theureau G, Thompson D. J, Thorsett S. E, Tibolla O, Torres D. F, Tramacere A, Usher T. L, Vandenbroucke J, Vianello G, Vilchez N, Villata M, Vitale V, von Kienlin A, Waite A. P, Wang P, Watters K, Weltevrede P, Winer B. L, Wood K. S, Ziegler M

    ASTROPHYSICAL JOURNAL   728 ( 2 )  2011年02月  [査読有り]

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    5
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  • Gamma-Ray Flares from the Crab Nebula

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Cannon A, Caraveo P. A, Casandjian J. M, Celik O, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Costamante L, Cutini S, D'Ammando F, Dermer C. D, de Angelis A, de Luca A, de Palma F, Digel S. W, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Dubois R, Dumora D, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashi K, Hayashida M, Hays E, Horan D, Itoh R, Johannesson G, Johnson A. S, Johnson T. J, Khangulyan D, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Longo F, Loparco F, Lubrano P, Madejski G. M, Makeev A, Marelli M, Mazziotta M. N, McEnery J. E, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Ormes J. F, Ozaki M, Paneque D, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Rando R, Ray P. S, Razzano M, Reimer A, Reimer O, Reposeur T, Ritz S, Romani R. W, Sadrozinski H. F. -W, Sanchez D, Parkinson P, M. Saz, Scargle J. D, Schalk T. L, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Troja E, Uchiyama Y, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Wang P, Wood K. S, Yang Z, Ziegler M

    SCIENCE   331 ( 6018 ) 739 - 742  2011年02月  [査読有り]

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  • INSIGHTS INTO THE HIGH-ENERGY gamma-RAY EMISSION OF MARKARIAN 501 FROM EXTENSIVE MULTIFREQUENCY OBSERVATIONS IN THE FERMI ERA

    ASTROPHYSICAL JOURNAL   727 ( 2 )  2011年02月  [査読有り]

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    156
    被引用数
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  • Searching for the most distant blazars with the Fermi Gamma-ray Space Telescope

    Yoshiyuki Inoue, Susumu Inoue, Masakazu A. R. Kobayashi, Tomonori Totani, Jun Kataoka, Rie Sato

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   411 ( 1 ) 464 - 468  2011年02月  [査読有り]

    　概要を見る

    We investigate the prospects for discovering blazars at very high redshifts (z greater than or similar to 3-6) with the Fermi Gamma-ray Space Telescope (hereinafter Fermi), employing a model for the evolving gamma-ray luminosity function (GLF) of the blazar population. Our previous GLF model is used as a basis, which features luminosity-dependent density evolution implied from X-ray data on active galactic nuclei as well as the blazar sequence paradigm for their spectral energy distribution, and which is consistent with the Energetic Gamma-Ray Experiment Telescope and the current Fermi observations of blazars. Here, we augment the high-redshift evolution of this model by utilizing the luminosity function of quasars from the Sloan Digital Sky Survey, which is well-constrained up to z similar to 5. We find that the Fermi may discover a few blazars up to z similar to 6 in the entire sky during its 5-yr survey. We further discuss how such high-redshift blazar candidates may be efficiently selected in the future Fermi data.

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    14
    被引用数
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  • Development of the small satellite “Tsubame”

    Toizumi, T, Enomoto, Yatsu, Y, Nakamori, T, Kawai, N, Ishizuka, K, Morishita, H, Akiyama, K, Kisa, N, Inagawa, S, Kawakubo, M, Nishida, J, Mizunuma, S, Matsunaga, S, Kataoka, J

    Physica E   43 ( 3 ) 685 - 688  2011年01月  [査読有り]

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    8
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  • CONSTRAINTS ON THE COSMIC-RAY DENSITY GRADIENT BEYOND THE SOLAR CIRCLE FROM FERMI gamma-RAY OBSERVATIONS OF THE THIRD GALACTIC QUADRANT

    Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom E. D, Bonamente E, Borgla, A. W, Brandt T. J, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dermer C. D, de Palma F, Digel S. W, Drell P. S, Dubois R, Favuzzi C, Ferrara E. C, Focke W. B, Fukazawa Y, Funk S, Fusco P, Gargano F, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashi K, Hayashida M, Hughes R. E, Itoh R, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Garde M. Llena, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makeev A, Martin P, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nishino S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ripken J, Sada T, Sadrozinski H. F. -W, Sgro C, Siskind E. J, Spandre G, Spinelli P, Strickman M. S, Strong A. W, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thompson D. J, Tibaldo L, Torres D. F, Tramacere A, Uchiyama Y, Uehara T, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, Vladimirov A. E, Waite A. P, Wang P, Wood K. S, Yang Z, Ziegler M

    ASTROPHYSICAL JOURNAL   726 ( 2 )  2011年01月  [査読有り]

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    35
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  • Time over Threshold Based Digital Animal PET (TODPET)

    K. Shimazoe, Y. Wang, H. Takahashi, K. Kamada, M. Yoshino, J. Kataoka, Y. Yamaya, T. Yanagida, A. Yoshikawa, K. Kumagai

    2011 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC)     3267 - 3271  2011年  [査読有り]

    　概要を見る

    We have developed Time over Threshold (ToT) based Pr:LuAG-APD PET (TODPET) tomograph with a mixed signal front-end. The tomograph consists of 8 block detectors, each of which is composed of a 12 x 12 array of 2 x 2 x 10mm(3) Pr:LuAG crystals individually coupled with 12 x 12 UV-enhanced APD arrays. The APDs are individually read out with a custom-designed Time over Threshold ASIC and FPGA readout system. Developed PET tomograph has the energy resolution of 10% and the time resolution of 4.2ns. The 1.76mm spatial resolution (FWHM) is achieved for the first result.

  • Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state

    A. Abramowski, F. Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, A. Barnacka, U. Barres De Almeida, A. R. Bazer-Bachi, Y. Becherini, J. Becker, B. Behera, K. Bernlöhr, A. Bochow, C. Boisson, J. Bolmont, P. Bordas, V. Borrel, J. Brucker, F. Brun, P. Brun, T. Bulik, I. Büsching, S. Casanova, M. Cerruti, P. M. Chadwick, A. Charbonnier, R. C.G. Chaves, A. Cheesebrough, L. M. Chounet, A. C. Clapson, G. Coignet, J. Conrad, M. Dalton, M. K. Daniel, I. D. Davids, B. Degrange, C. Deil, H. J. Dickinson, A. Djannati-Ataï, W. Domainko, L. O. Drury, F. Dubois, G. Dubus, J. Dyks, M. Dyrda, K. Egberts, P. Eger, P. Espigat, L. Fallon, C. Farnier, S. Fegan, F. Feinstein, M. V. Fernandes, A. Fiasson, G. Fontaine, A. Förster, M. Füßling, S. Gabici, Y. A. Gallant, H. Gast, L. Gérard, D. Gerbig, B. Giebels, J. F. Glicenstein, B. Glück, P. Goret, D. Göring, J. D. Hague, D. Hampf, M. Hauser, S. Heinz, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, A. Hoffmann, W. Hofmann, P. Hofverberg, D. Horns, A. Jacholkowska, O. C. De Jager, C. Jahn, M. Jamrozy, I. Jung, M. A. Kastendieck, K. Katarzyński, U. Katz, S. Kaufmann, D. Keogh, M. Kerschhaggl, D. Khangulyan, B. Khélifi, D. Klochkov, W. Kluåniak, T. Kneiske, Nu Komin, K. Kosack, R. Kossakowski, H. Laffon, G. Lamanna

    Astronomy and Astrophysics   533  2011年

    　概要を見る

    The high-frequency peaked BL Lac object PKS 2005-489 was the target of a multi-wavelength campaign with simultaneous observations in the TeV γ-ray (H.E.S.S.), GeV γ-ray (Fermi/LAT), X-ray (RXTE, Swift), UV (Swift) and optical (ATOM, Swift) bands. This campaign was carried out during a high flux state in the synchrotron regime. The flux in the optical and X-ray bands reached the level of the historical maxima. The hard GeV spectrum observed with Fermi/LAT connects well to the very high energy (VHE, E > 100 GeV) spectrum measured with H.E.S.S. © 2011 ESO.

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  • Experimental demonstration of single-photon detection using InGaAs avalanche photodiode operated in sub-Geiger mode

    Kenji Tsujino, Yoshito Miyamoto, Jun Kataoka, Akihisa Tomita

    AIP Conference Proceedings   1363   351 - 354  2011年

    　概要を見る

    The avalanche photodiode (APD) is a promising device for single-photon detection. In this study, we operated an InGaAs APD in the sub-Geiger mode. In this mode, a gate pulse is not needed; therefore, we can detect photons with asynchronous timing. The detection efficiency and the dark count rate were 2.2% and 7900 counts per second (cps), respectively. © 2011 American Institute of Physics.

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  • Scintillation properties of transparent Lu3Al5O12 (LuAG) ceramics doped with different concentrations of Pr3+

    Takayuki Yanagida, Akihiro Fukabori, Yutaka Fujimoto, Akio Ikesue, Kei Kamada, Jun Kataoka, Yuui Yokota, Akira Yoshikawa, Valery Chani

    PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 1   8 ( 1 ) 140 - 143  2011年  [査読有り]

    　概要を見る

    Transparent ceramics of Pr-doped (0.2 mol%, 0.6 mol%, 1 mol%, and 2 mol%) Lu3Al5O12 (LuAG) scintillators produced by the sintering method are discussed. These materials were cut to the specimens with physical dimensions of 5 x 5 x 2 mm(3). Similar size specimens were also prepared from Czochralski grown Pr:LuAG single crystals to compare scintillation properties. Their transmittance and radio luminescence spectra were evaluated. All specimens were highly transparent in wavelength range above 300 nm, and intense Pr3+ 5d-4f emission was detected around 310 and 370 nm under excitation with X-ray. Under Cs-137 gamma-ray is irradiation, 2 keV photoabsorption peaks were also clearly observed in each sample. The Pr 0.6 mol% doped LuAG ceramics demonstrated highest light yield achievable among the ceramics, and it was half of that observed in the single crystals. Under pulse X-ray excitation, the decay time constants became faster when Pr concentration increased, and. the fastest decay (similar to 5.7 ns time constant) was noticed in the 2 mol% doped ceramic. (c) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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  • FERMI-LAT SEARCH FOR PULSAR WIND NEBULAE AROUND GAMMA-RAY PULSARS

    Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Camilo F, Caraveo P. A, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cognard I, Cohen-Tanugi J, Conrad J, Dermer C. D, de Angelis A, de Luca A, de Palma F, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Favuzzi C, Focke W. B, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashi K, Hays E, Hobbs G, Hughes R. E, Johannesson G, Johnson A. S, Johnson W. N, Johnston S, Kamae T, Katagiri H, Kataoka J, Keith M, Kerr M, Knoedlseder J, Kramer M, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Lyne A. G, Makeev A, Marelli M, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Noutsos A, Nuss E, Ohsugi T, Okumura A, Ormes J. F, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Ransom S. M, Ray P. S, Razzano M, Rea N, Reimer A, Reimer O, Reposeur T, Ripken J, Ritz S, Romani R. W, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Theureau G, Thompson D. J, Thorsett S. E, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Uehara T, Usher T. L, Vandenbroucke J, Van Etten A, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wang P, Weltevrede P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   726 ( 1 )  2011年01月  [査読有り]

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  • MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER

    ASTROPHYSICAL JOURNAL   726 ( 1 )  2011年01月  [査読有り]

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  • Search for gamma-ray emission from magnetars with the Fermi large area telescope

    A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, R. Bellazzini, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, J. Bregeon, M. Brigida, P. Bruel, T. H. Burnett, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, C. Cecchi, Ö Çelik, S. Chaty, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Conrad, P. R. Den Hartog, C. D. Dermer, A. De Angelis, F. De Palma, R. Dib, M. Dormody, E. Do Couto E Silva, P. S. Drell, R. Dubois, D. Dumora, T. Enoto, C. Favuzzi, M. Frailis, P. Fusco, F. Gargano, N. Gehrels, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, E. Hays, G. L. Israel, G. Jóhannesson, A. S. Johnson, V. M. Kaspi, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, S. H. Lee, M. Lemoine-Goumard, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, A. Makeev, M. Marelli, M. N. Mazziotta, J. E. McEnery, J. Mehault, P. F. Michelson, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, P. L. Nolan, E. Nuss, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, D. Parent, M. Pepe

    Astrophysical Journal Letters   725 ( 1 PART 2 )  2010年12月

    　概要を見る

    We report on the search for 0.1-10GeV emission from magnetars in 17months of Fermi LargeAreaTelescope (LAT) observations. No significant evidence for gamma-ray emission from any of the currently known magnetars is found. The most stringent upper limits to date on their persistent emission in the Fermi energy range are estimated between ∼10-12 and 10-10 erg s-1 cm-2, depending on the source.We also searched for gamma-ray pulsations and possible outbursts, also with no significant detection. The upper limits derived support the presence of a cutoff at an energy below a few MeV in the persistent emission of magnetars. They also show the likely need for a revision of current models of outer-gap emission from stronglymagnetized pulsars, which, in some realizations, predict detectableGeV emission frommagnetars at flux levels exceeding the upper limits identified here using the Fermi-LAT observations. © 2010. The American Astronomical Society. All rights reserved.

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  • A thermal-neutron detector with a phoswich system of LiCaAlF<inf>6</inf>and BGO crystal scintillators onboard PoGOLite

    H. Takahashi, M. Yonetani, M. Matsuoka, T. Mizuno, Y. Fukazawa, T. Yanagida, Y. Fujimoto, Y. Yokota, A. Yoshikawa, N. Kawaguchi, S. Ishizu, K. Fukuda, T. Suyama, K. Watanabe, H. Tajima, Y. Kanai, N. Kawai, J. Kataoka, J. Katsuta, T. Takahashi, S. Gunji, M. Axelsson, M. Jackson, M. Kiss, W. Klamra, M. Kole, S. Larsson, P. Mallol, M. Pearce, F. Ryde, S. Rydstrom, G. Olofsson, H. G. Floren, T. Kamae, G. Madejski, G. Varner

    IEEE Nuclear Science Symposium Conference Record     32 - 37  2010年12月

    　概要を見る

    To measure the flux of atmospheric neutrons and study the neutron contribution to the background of the main detector of the PoGOLite (Polarized Gamma-ray Observer) balloon-borne experiment, a thermal-neutron detector with a phoswich system of LiCaAlF6(Eu) and BGO crystal scintillators is developed. The performance to separate thermal-neutron events from those of gamma-rays and charged particles is validated with252Cf on ground. The detector is attached to the PoGOLite instrument and is launched in 2011 from the Esrange facility in the North of Sweden. Although the emission wavelength of the LiCaAlF6(Ce) is 300 nm and overlaps with the absorption wavelength of the BGO, the phoswich capability of the LiCaAlF6(Ce) with the BGO is also confirmed with installing a waveform shifter. © 2010 IEEE.

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  • Small Satellite "TSUBAME" for Polarimetry of Gamma-ray Burst

    Enomoto, T, Kawakami, K, Tokoyoda, K, Toizumi, T, Yatsu, Y, Kawai, N, Matsunaga, S, Nakamori, T, Kataoka, J, Kubo, S

    Proc. of 4th MAXI Workshop     65 - 4pp  2010年12月

  • A NOVEL APPROACH IN CONSTRAINING ELECTRON SPECTRA IN BLAZAR JETS: THE CASE OF Markarian 421

    Masayoshi Ushio, Lukasz Stawarz, Tadayuki Takahashi, David Paneque, Grzegorz Madejski, Masaaki Hayashida, Jun Kataoka, Yasuyuki T. Tanaka, Takaaki Tanaka, Michal Ostrowski

    ASTROPHYSICAL JOURNAL   724 ( 2 ) 1509 - 1516  2010年12月  [査読有り]

    　概要を見る

    We report results from the observations of the well-studied TeV blazar Mrk 421 with the Swift and the Suzaku satellites in 2008 December. During the observation, Mrk 421 was found in a relatively low activity state, with the corresponding 2-10 keV flux of 3 x 10(-10) erg s(-1) cm(-2). For the purpose of robustly constraining the UV-to-X-ray emission continuum we selected only the data corresponding to truly simultaneous time intervals between Swift and Suzaku, allowing us to obtain a good-quality, broadband spectrum despite a modest length (0.6 ks) exposure. We analyzed the spectrum with the parametric forward-fitting SYNCHROTRON model implemented in XSPEC assuming two different representations of the underlying electron energy distribution, both well motivated by the current particle acceleration models: a power-law distribution above the minimum energy gamma(min) with an exponential cutoff at the maximum energy gamma(max), and a modified ultra-relativistic Maxwellian with an equilibrium energy gamma(eq). We found that the latter implies unlikely physical conditions within the blazar zone of Mrk 421. On the other hand, the exponentially moderated power-law electron distribution gives two possible sets of the model parameters: (1) flat spectrum dN'(e)/d gamma proportional to gamma(-1.91) with low minimum electron energy gamma(min) &lt; 10(3), and (2) steep spectrum proportional to gamma(-2.77) with high minimum electron energy gamma(min) similar or equal to 2 x 10(4). We discuss different interpretations of both possibilities in the context of a diffusive acceleration of electrons at relativistic, sub- or superluminal shocks. We also comment on exactly how the gamma-ray data can be used to discriminate between the different proposed scenarios.

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  • A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope

    A. A. Abdo, M. Ackermann, M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, E. Charles, S. Chaty, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, M. E. Decesar, C. D. Dermer, F. De Palma, S. W. Digel, E. Do Couto E Silva, P. S. Drell, R. Dubois, D. Dumora, C. Favuzzi, P. Fortin, M. Frailis, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, I. Grenier, M. H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, D. Hadasch, A. K. Harding, E. Hays, P. Jean, G. Jóhannesson, T. J. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, S. H. Lee, M. Lemoine-Goumard, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, A. Makeev, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, B. Pancrazi

    Astronomy and Astrophysics   524 ( 3 )  2010年11月

    　概要を見る

    Context. Globular clusters with their large populations of millisecond pulsars (MSPs) are believed to be potential emitters of high-energy gamma-ray emission. The observation of this emission provides a powerful tool to assess the millisecond pulsar population of a cluster, is essential for understanding the importance of binary systems for the evolution of globular clusters, and provides complementary insights into magnetospheric emission processes. Aims. Our goal is to constrain the millisecond pulsar populations in globular clusters from analysis of gamma-ray observations. Methods. We use 546 days of continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope to study the gamma-ray emission towards 13 globular clusters. Results. Steady point-like high-energy gamma-ray emission has been significantly detected towards 8 globular clusters. Five of them (47 Tucanae, Omega Cen, NGC 6388, Terzan 5, and M 28) show hard spectral power indices (0.7 < Γ <1.4) and clear evidence for an exponential cut-off in the range 1.0-2.6 GeV, which is the characteristic signature of magnetospheric emission from MSPs. Three of them (M 62, NGC 6440 and NGC 6652) also show hard spectral indices (1.0 < Γ < 1.7), however the presence of an exponential cut-off can not be unambiguously established. Three of them (Omega Cen, NGC 6388, NGC 6652) have no known radio or X-ray MSPs yet still exhibit MSP spectral properties. From the observed gamma-ray luminosities, we estimate the total number of MSPs that is expected to be present in these globular clusters. We show that our estimates of the MSP population correlate with the stellar encounter rate and we estimate 2600-4700 MSPs in Galactic globular clusters, commensurate with previous estimates. Conclusions. The observation of high-energy gamma-ray emission from globular clusters thus provides a reliable independent method to assess their millisecond pulsar populations. © ESO, 2010. © 2010 ESO.

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  • Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV

    Ackermann M, Ajello M, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman B. M, Bechtol K, Bellardi F, Bellazzini R, Belli F, Berenji B, Blandford R. D, Bloom E. D, Bogart J. R, Bonamente E, Borgla, A. W, Brandt T. J, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Burnett T. H, Busetto G, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carlson P, Carrigan S, Casandjian J. M, Ceccanti M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Cillis A. N, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Corbet R, DeKlotz M, Dermer C. D, de Angelis A, de Palma F, Digel S. W, Di Bernardo G, do Couto e, Silva E, Drell P. S, Drlica-Wagner A, Dubois R, Fabiani D, Favuzzi C, Fegan S. J, Fortin P, Fukazawa Y, Funk S, Fusco P, Gaggero D, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grasso D, Grenier I. A, Grondin M. -H, Grove J. E, Guiriec S, Gustafsson M, Hadasch D, Harding A. K, Hayashida M, Hays E, Horan D, Hughes R. E, Johannesson G, Johnson A. S, Johnson R. P, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Minuti M, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Moretti E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Petrosian V, Pinchera M, Piron F, Porter T. A, Profumo S, Raino S, Rando R, Rapposelli E, Razzano M, Reimer A, Reimer O, Reposeur T, Ripken J, Ritz S, Rochester L. S, Romani R. W, Roth M, Sadrozinski H. F. -W, Saggini N, Sanchez D, Sander A, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Stawarz L, Stephens T. E, Strickman M. S, Strong A. W, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Turri M, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wallace E, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    PHYSICAL REVIEW D   82 ( 9 )  2010年11月  [査読有り]

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  • Searches for cosmic-ray electron anisotropies with the Fermi Large Area Telescope

    Ackermann M, Ajello M, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cuoco A, Dermer C. D, de Angelis A, de Palma F, Digel S. W, Di Bernardo G, do Couto e, Silva E, Drell P. S, Dubois R, Favuzzi C, Fegan S. J, Focke W. B, Frailis M, Fukazawa Y, Funk S, Fusco P, Gaggero D, Gargano F, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grasso D, Grenier I. A, Grove J. E, Guiriec S, Gustafsson M, Hadasch D, Harding A. K, Hayashi K, Hays E, Hughes R. E, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Moretti E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Profumo S, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Ripken J, Ritz S, Roth M, Sadrozinski H. F. -W, Sander A, Schalk T. L, Sgro C, Siegal-Gaskins J, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Strong A. W, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Zaharijas G, Ziegler M

    PHYSICAL REVIEW D   82 ( 9 )  2010年11月  [査読有り]

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  • Detection of the Small Magellanic Cloud in gamma-rays with Fermi /LAT

    A. A. Abdo, M. Ackermann, M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, T. J. Brandt, J. Bregeon, A. Brez, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, C. Cecchi, Ö Çelik, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, C. D. Dermer, F. De Palma, S. W. Digel, E. Do Couto E Silva, P. S. Drell, R. Dubois, D. Dumora, C. Favuzzi, S. J. Fegan, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, S. Guiriec, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, P. Jean, G. Jóhannesson, A. S. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, S. H. Lee, M. Lemoine-Goumard, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, A. Makeev, P. Martin, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori

    Astronomy and Astrophysics   523 ( 3 )  2010年11月

    　概要を見る

    Context. The flux of gamma rays with energies greater than 100 MeV is dominated by diffuse emission coming from cosmic-rays (CRs) illuminating the interstellar medium (ISM) of our Galaxy through the processes of Bremsstrahlung, pion production and decay, and inverse-Compton scattering. The study of this diffuse emission provides insight into the origin and transport of cosmic rays. Aims.We searched for gamma-ray emission from the Small Magellanic Cloud (SMC) in order to derive constraints on the cosmic-ray population and transport in an external system with properties different from the Milky Way. Methods.We analysed the first 17 months of continuous all-sky observations by the Large Area Telescope (LAT) of the Fermi mission to determine the spatial distribution, flux and spectrum of the gamma-ray emission from the SMC. We also used past radio synchrotron observations of the SMC to study the population of CR electrons specifically. Results.We obtained the first detection of the SMC in high-energy gamma rays, with an integrated >100MeV flux of (3.7±0.7)×10-8 ph cm-2 s-1, with additional systematic uncertainty of ≤16%. The emission is steady and from an extended source ∼3. in size. It is not clearly correlated with the distribution of massive stars or neutral gas, nor with known pulsars or supernova remnants, but a certain correlation with supergiant shells is observed. Conclusions.The observed flux implies an upper limit on the average CR nuclei density in the SMC of ∼15% of the value measured locally in the Milky Way. The population of high-energy pulsars of the SMC may account for a substantial fraction of the gamma-ray flux, which would make the inferred CR nuclei density even lower. The average density of CR electrons derived from radio synchrotron observations is consistent with the same reduction factor but the uncertainties are large. From our current knowledge of the SMC, such a low CR density does not seem to be due to a lower rate of CR injection and rather indicates a smaller CR confinement volume characteristic size. © 2010 ESO.

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  • Fermi Large Area Telescope observations of Local Group galaxies: Detection of M 31 and search for M 33

    A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, A. Cannon, P. A. Caraveo, J. M. Casandjian, C. Cecchi, Ö Çelik, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, C. D. Dermer, A. De Angelis, F. De Palma, S. W. Digel, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, C. Favuzzi, S. J. Fegan, P. Fortin, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, S. Guiriec, M. Gustafsson, D. Hadasch, A. K. Harding, K. Hayashi, M. Hayashida, E. Hays, S. E. Healey, P. Jean, G. Jóhannesson, A. S. Johnson, R. P. Johnson, T. J. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, S. H. Lee, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, A. Makeev, P. Martin, M. N. Mazziotta, J. Mehault, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte

    Astronomy and Astrophysics   523 ( 1 )  2010年11月

    　概要を見る

    Context. Cosmic rays (CRs) can be studied through the galaxy-wide gamma-ray emission that they generate when propagating in the interstellar medium. The comparison of the diffuse signals from different systems may inform us about the key parameters in CR acceleration and transport. Aims. We aim to determine and compare the properties of the cosmic-ray-induced gamma-ray emission of several Local Group galaxies. Methods. We use 2 years of nearly continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope to search for gamma-ray emission from M 31 and M 33. We compare the results with those for the Large Magellanic Cloud, the Small Magellanic Cloud, the Milky Way, and the starburst galaxies M 82 and NGC 253. Results. We detect a gamma-ray signal at 5σ significance in the energy range 200 MeV-20 GeV that is consistent with originating from M 31. The integral photon flux above 100 MeV amounts to (9.1 ± 1.9stat ± 1.0) × 10-9 ph cm-2. We find no evidence for emission from M 33 and derive an upper limit on the photon flux >100 MeV of 5.1 × 10-9 ph cm-2-1 (2σ). Comparing these results to the properties of other Local Group galaxies, we find indications of a correlation between star formation rate and gamma-ray luminosity that also holds for the starburst galaxies. Conclusions. The gamma-ray luminosity of M 31 is about half that of the Milky Way, which implies that the ratio between the average CR densities in M 31 and the Milky Way amounts to ξ = 0.35 ± 0.25. The observed correlation between gamma-ray luminosity and star formation rate suggests that the flux of M 33 is not far below the current upper limit from the LAT observations. © 2010 ESO.

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  • FERMI LARGE AREA TELESCOPE CONSTRAINTS ON THE GAMMA-RAY OPACITY OF THE UNIVERSE

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Berenji B, Bhat P. N, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brez A, Briggs M. S, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik O, Charles E, Chekhtman A, Chen A. W, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Connaughton V, Conrad J, Costamante L, Dermer C. D, de Angelis A, de Palma F, Digel S. W, Dingus B. L, do Couto e, Silva E, Drell P. S, Dubois R, Favuzzi C, Fegan S. J, Finke J, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Gilmore R. C, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Granot J, Greiner J, Grenier I. A, Grove J. E, Guiriec S, Gustafsson M, Hadasch D, Hayashida M, Hays E, Horan D, Hughes R. E, Johannesson G, Johnson A. S, Johnson R. P, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kocevski D, Kuss M, Lande J, Latronico L, Lee S-H, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Mazziotta N, McConville W, McEnery J. E, McGlynn S, Mehault J, Meszaros P, Michelson P. F, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Moretti E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Primack J. R, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reyes L. C, Ripken J, Ritz S, Romani R. W, Roth M, Sadrozinski H. F. -W, Sanchez D, Sander A, Scargle J. D, Schalk T. L, Sgro C, Shaw M. S, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Stecker F. W, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, von Kienlin A, Waite A. P, Wang P, Wilson-Hodge C, Winer B. L, Wood K. S, Yamazaki R, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   723 ( 2 ) 1082 - 1096  2010年11月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE OBSERVATION OF A GAMMA-RAY SOURCE AT THE POSITION OF ETA CARINAE

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Burnett T. H, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Chaty S, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Cominsky L. R, Conrad J, Dermer C. D, de Palma F, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Favuzzi C, Fegan S. J, Ferrara E. C, Frailis M, Fukazawa Y, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giordano F, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hays E, Hill A. B, Horan D, Hughes R. E, Itoh R, Jackson M. S, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Livingstone M, Garde M. Llena, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Rodriguez A. Y, Romani R. W, Roth M, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wallace E, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   723 ( 1 ) 649 - 657  2010年11月  [査読有り]

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  • FERMI-LAT STUDY OF GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W49B

    Abdo A. A, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Celik Oe, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dermer C. D, de Palma F, Digel S. W, do Couto e, Silva E, Drell P. S, Dumora D, Favuzzi C, Funk S, Fusco P, Gargano F, Gehrels N, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M-H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hays E, Horan D, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Katsuta J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S-H, Lemoine-Goumard M, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Ripken J, Roth M, Sadrozinski H. FW, Sander A, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spinelli P, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   722 ( 2 ) 1303 - 1311  2010年10月  [査読有り]

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  • GAMMA-RAY LIGHT CURVES AND VARIABILITY OF BRIGHT FERMI-DETECTED BLAZARS

    Abdo A. A, Ackermann M, Ajello M, Antolini E, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Cominsky L. R, Conrad J, Costamante L, Cutini S, Dermer C. D, de Angelis A, de Palma F, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giebels B, Giglietto N, Giommi P, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grondin M.-H, Grove J. E, Guiriec S, Hadasch D, Hayashida M, Hays E, Healey S. E, Horan D, Hughes R. E, Itoh R, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Massaro E, Mazziotta M. N, McEnery J. E, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Mueller M, Murgia S, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F.-W, Sander A, Scargle J. D, Sgro C, Shaw M. S, Smith P. D, Spandre G, Spinelli P, Starck J.-L, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wallace E, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   722 ( 1 ) 520 - 542  2010年10月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE AND MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING ACTIVITY OF PKS 1510-089 BETWEEN 2008 SEPTEMBER AND 2009 JUNE

    Abdo A. A, Ackermann M, Agudo I, Ajello M, Allafort A, Aller H. D, Aller M. F, Antolini E, Arkharov A. A, Axelsson M, Bach U, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berdyugin A, Berenji B, Blandford R. D, Blinov D. A, Bloom E. D, Boettcher M, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buemi C. S, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carosati D, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Chekhtman A, Chen W. P, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Corbel S, Costamante L, Dermer C. D, de Angelis A, de Palma F, Donato D, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Forne E, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giebels B, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grove J. E, Guiriec S, Gurwell M. A, Gusbar C, Gomez J. L, Hadasch D, Hagen-Thorn V. A, Hayashida M, Hays E, Horan D, Hughes R. E, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Kimeridze G, Knoedlseder J, Konstantinova T. S, Kopatskaya E. N, Koptelova E, Kovalev Y. Y, Kurtanidze O. M, Kuss M, Lahteenmaki A, Lande J, Larionov V. M, Larionova E. G, Larionova L. V, Larsson S, Latronico L, Lee S. -H, Leto P, Lister M. L, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Massaro E, Mazziotta M. N, McConville W, McEnery J. E, McHardy I. M, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morozova D. A, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nikolashvili M. G, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pasanen M, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Pushkarev A. B, Raino S, Raiteri C. M, Rando R, Razzano M, Reimer A, Reimer O, Reinthal R, Ripken J, Ritz S, Roca-Sogorb M, Rodriguez A. Y, Roth M, Roustazadeh P, Ryde F, Sadrozinski H. F. -W, Sander A, Scargle J. D, Sgro C, Sigua L. A, Smith P. D, Sokolovsky K, Spandre G, Spinelli P, Starck J. -L, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Takalo L. O, Tanaka T, Taylor B, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Tornikoski M, Torres D. F, Tosti G, Tramacere A, Trigilio C, Troitsky I. S, Umana G, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Villata M, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   721 ( 2 ) 1425 - 1447  2010年10月  [査読有り]

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  • FERMI GAMMA-RAY SPACE TELESCOPE OBSERVATIONS OF GAMMA-RAY OUTBURSTS FROM 3C 454.3 IN 2009 DECEMBER AND 2010 APRIL

    Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bonamente E, Borgland A. W, Bregeon J, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Corbel S, Cutini S, D'Ammando F, Dermer C. D, de Angelis A, de Palma F, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Escande L, Favuzzi C, Fegan S. J, Ferrara E. C, Fuhrmann L, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giebels B, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grove J. E, Guiriec S, Hadasch D, Hayashida M, Hays E, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lee S. -H, Garde M. Llena, Longo F, Loparco F, Lott B, Lubrano P, Madejski G. M, Makeev A, Marchili N, Mazziotta M. N, McEnery J. E, Mehault J, Michelson P. F, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nalewajko K, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reyes L. C, Ripken J, Ritz S, Roth M, Sadrozinski H. F. -W, Sanchez D, Sander A, Scargle J. D, Sgro C, Sikora M, Siskind E. J, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Tanaka Y, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Usher T. L, Vandenbroucke J, Vilchez N, Vitale V, Waite A. P, Wang P, Wehrle A. E, Winer B. L, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   721 ( 2 ) 1383 - 1396  2010年10月  [査読有り]

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  • Development of X-ray/Gamma-ray Imaging Spectrometer with Reach-through APD arrays

    Nakamori, T, Enomoto, T, Toizumi, T, Yatsu, Y, Kawai, N, Kataoka, J, Ishikawa, Y, Kawai, T, Kawabata, N, Matsunaga, Y

    AIP Conference Proceedings   1279   400 - 402  2010年10月

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  • Development of an APD-Based PET Module and Preliminary Resolution Performance of an Experimental Prototype Gantry

    Jun Kataoka, Hidenori Matsuda, Fumihiko Nishikido, Makoto Koizumi, Hirokazu Ikeda, Masao Yoshino, Takamasa Miura, Satoshi Tanaka, Yoshitaka Ishikawa, Nobuyuki Kawabata, Keiji Shimizu, Yusuke Matsunaga, Shunji Kishimoto, Hidetoshi Kubo, Yoshio Yanagida, Takeshi Nakamori

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   57 ( 5 ) 2448 - 2454  2010年10月

    　概要を見る

    The development of a high-resolution Positron Emission Tomography (PET) technique with sub-millimeter spatial resolution, which utilizes newly designed reverse-type APD-arrays, is uderway. All the detector blocks are modularized with the overall dimension of each module, including the APD array, LYSO scintillator matrix and Front-End Circuits (FECs), which are only 30 x 30 x 80 mm(3). Each APD device also has a monolithic 16 x 16 pixel structure with an active area of 1.0 mm(2) per pixel. The FEC includes two identical analog ASICs specifically designed for APDs with a noise characteristic of 560 + 30 e(-)/pF and a timing resolution of 460 ps (rms), respectively. An energy resolution of 13.7 +/- 1.1% (FWHM) with 662 keV gamma-rays was measured using the 16 x 16 arrays. At this stage a pair of module and coincidence circuits has been assembled into an experimental prototype gantry. Spatial resolutions of 0.9, 1.4, and 1.3 mm (FWHM) were obtained from FBP reconstructed images in preliminary experiments with a point source positioned centrally, and 1 and 5 mm off-center, respectively. Comparison with a Monte-Carlo simulation of a fully-designed gantry over a wider range of field-of-view showed good correlation with the experimental data. A simple but conceptual design of a DOI configuration is also proposed as a test example of a future APD-PET scanner.

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  • APD-PETモジュールの開発と解像度の実験的検証

    J.Kataoka

    IEEE Transactions on Nuclear Science   57 ( 5 ) 2448 - 2454  2010年10月  [査読有り]

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  • FERMI-LAT OBSERVATIONS OF THE GEMINGA PULSAR

    Abdo A. A, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastier D, Baughman B. M, Bechtol K, Bellazzini R, Berenji B, Bignami G. F, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Brueli P, Burnett T. H, Caliandro G. A, Cameron R. A, Caraveo P. A, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dermer C. D, de Palma F, Dormody M, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Edmonds Y, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Frailis M, Furazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giavitto G, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Hardino A. K, Hays E, Hughes R. E, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Marelli M, Mazziotta M. N, McEnery J. E, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenk I. V, Murgia S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Rayi P. S, Razzano M, Reimer A, Reimer O, Reposeur T, Rochester L. S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Usher T. L, Van Etten A, Vasileiou V, Venter C, Vilchez N, Vitale V, Waite A. P, Wang P, Watters K, Winer B. L, Wood K. S, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   720 ( 1 ) 272 - 283  2010年09月  [査読有り]

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  • THE FERMI-LAT HIGH-LATITUDE SURVEY: SOURCE COUNT DISTRIBUTIONS AND THE ORIGIN OF THE EXTRAGALACTIC DIFFUSE BACKGROUND

    Abdo A. A, Ackermann M, Ajello M, Antolini E, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Costamante L, Cutini S, Dermer C. D, de Angelis A, de Palma F, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grove J. E, Guiriec S, Hadasch D, Hayashida M, Hays E, Healey S. E, Horan D, Hughes R. E, Itoh R, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lurrano P, Madejski G. M, Makeev A, Mazziotta M. N, McConville W, McEnery J. E, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzan M, Reimer A, Reimer O, Ritz S, Rochester L. S, Rodriguez A. Y, Romani R. W, Roth M, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Shaw M. S, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Strickman M. S, Strong A. W, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   720 ( 1 ) 435 - 453  2010年09月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF GAMMA-RAY PULSARS PSR J1057-5226, J1709-4429, AND J1952+3252

    Ardo A. A, Ajello M, Antolini E, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Camilo F, Caraveo P. A, Celik Oe, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cognard I, Cohen-Tanugi J, Dermer C. D, De Palma F, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Favuzzi C, Ferrara E. C, Fortin P, Frailis M, Freire P. C. C, Fukazawa Y, Funk S, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hays E, Johannesson G, Johnson R. P, Johnson T. J, Johnson W. N, Johnston S, Kamae T, Katagiri H, Kataoka J, Keith M, Kerr M, Knoedlseder J, Kramer M, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lubrano P, Makeev A, Manchester R. N, Marelli M, Mazziotta M. N, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Mnzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nolan P. L, Norris J. P, Noutos A, Nuss E, Ohsugi T, Okumura A, Orlando E, Ormes J. F, Ozaki M, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Raino S, Razzano M, Reimer A, Reimer O, Reposeur T, Rirken J, Romani R. W, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Tanaka T, Thayer J. B, Thayer J. G, Theureau G, Thompson D. J, Thorsett S. E, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Usher T. L, Vandenbroucke J, Vasileiou V, Vitale V, Waite A. P, Wang P, Weltevrede P, Winer B. L, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   720 ( 1 ) 26 - 40  2010年09月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF MISALIGNED ACTIVE GALACTIC NUCLEI

    Abdo A. A, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Cannon A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Celotti A, Charles E, Chekhtman A, Chen A. W, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Colafrancesco S, Conrad J, Davis D. S, Dermer C. D, de Angelis A, de Palma F, do Couto e, Silva E, Drell P. S, Dubois R, Favuzzi C, Fegan S. J, Ferrara E. C, Fortin P, Frailis M, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grandi P, Grenier I. A, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Hayashida M, Hays E, Horan D, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S-H, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Malaguti G, Mazziotta M. N, McConville W, McEnery J. E, Michelson P. F, Migliori G, Mitthumsiri W, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Naumann-Godo M, Nestoras I, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes J. F, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Persic M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reyes L. C, Roth M, Sadrozinski H. F-W, Sanchez D, Sander A, Scargle J. D, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Stawarz L, Stecker F. W, Strickman M. S, Suson D. J, Takahashi H, Tanaka T, Thayer J. B, Thaver J. G, Thompson D. J, Tibaldo L, Torres D. F, Torresi E, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Villata M, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   720 ( 1 ) 912 - 922  2010年09月  [査読有り]

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  • FERMI LARGE AREA TELESCOPE VIEW OF THE CORE OF THE RADIO GALAXY CENTAURUS A

    Abdo A. A, Ackermann M, Ajello M, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Cannon A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Colafrancesco S, Cominsky L. R, Conrad J, Costamante L, Davis D. S, Dermer C. D, de Angelis A, de Palma F, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Falcone A, Farnier C, Favuzzi C, Fegan S. J, Finke J, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Georganopoulos M, Germani S, Giebels B, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grandi P, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Harding A. K, Hase Hayo, Hayashida M, Hays E, Horan D, Hughes R. E, Itoh R, Jackson M. S, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Kadler M, Kamae T, Katagiri H, Kataoka J, Kawai N, Kishishita T, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McConville W, McEnery J. E, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Mueller C, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Ojha R, Okumura A, Omodei N, Orlando E, Ormes J. F, Ozaki M, Pagani C, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Plotz C, Porter T. A, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Ripken J, Ritz S, Rodriguez A. Y, Roth M, Ryde F, Sadrozinski H. F. -W, Sanchez D, Sander A, Scargle J. D, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Stawarz L, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vandenbroucke J, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   719 ( 2 ) 1433 - 1444  2010年08月  [査読有り]

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  • Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni

    Abdo, A. A, Ackermann, M, Ajello, M, Atwood, W. B, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, R. D, Bloom, E. D, Bonamente, E, Borgland, A. W, Bouvier, A, Brandt, T. J, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Burnett, T. H, Buson, S, Caliandro, G. A, Cameron, R. A, Caraveo, P. A, Carrigan, S, Casandjian, J. M, Cecchi, C, Celik, O, Charles, E, Chaty, S, Chekhtman, A, Cheung, C. C, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Corbel, S, Corbet, R, DeCesar, M. E, den Hartog, P. R, Dermer, C. D, de Palma, F, Digel, S. W, Donato, D, do Couto e, Silva, E, Drell, P. S, Dubois, R, Dubus, G, Dumora, D, Favuzzi, C, Fegan, S. J, Ferrara, E. C, Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, I. A, Grondin, M. -H, Grove, J. E, Guiriec, S, Hadasch, D, Harding, A. K, Hayashida, M, Hays, E, Healey, S. E, Hill, A. B, Horan, D, Hughes, R. E, Itoh, R, Jean, P, Johannesson, G, Johnson, A. S, Johnson, R. P, Johnson, T. J, Johnson, W. N, Kamae, T, Katagiri, H, Kataoka, J, Kerr, M, Knodlseder, J, Koerding, E, Kuss, M, Lande, J, Lande, J, Lee, S. -H, Lemoine-Goumard, M, Llena Garde, M, Longo, F, Loparco, F, Lott, B, Lovellette, M. N, Lubrano, P, Makeev, A, Mazziotta, M. N, McConville, W, McEnery, J. E, Mehault, J, Michelson, P. F, Mizuno, T, Moiseev, A. A, Monte, C, Monzani, M. E, Morselli, A, Moskalenko, I. V, Murgia, S, Nakamori, T, Naumann-Godo, M, Nestoras, I, Nolan, P. L, Norris, J. P, Nuss, E, Ohno, M, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, J. F, Ozaki, M, Paneque, D, Panetta, J. H, Parent, D, Pelassa, V, Pepe, M, Pesce-Rollins, M, Piron, F, Porter, T. A, Raino, S, Rando, R, Ray, P. S, Razzano, M, Razzaque, S, Rea, N, Reimer, A, Reimer, O, Reposeur, T, Ripken, J, Ritz, S, Romani, R. W, Roth, M, Sadrozinski, H. F. W, Sander, A, Parkinson, P. M. Saz, Scargle, J. D, Schinzel, F. K, Sgro, C, Shaw, M. S, Siskind, E. J, Smith, D. A, Smith, P. D, Sokolovsky, K. V, Spandre, G, Spinelli, P, Stawarz, L, Strickman, M. S, Suson, D. J, Takahashi, H, Takahashi, T, Tanaka, T, Tanaka, Y, Thayer, J. B, Thayer, J. G, Thompson, D. J, Tibaldo, L, Torres, D. F, Tosti, G, Tramacere, A, Uchiyama, Y, Usher, T. L, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, A. P, Wallace, E, Wang, P, Winer, B. L, Wolff, M. T, Wood, K. S, Yang, Z, Ylinen, T, Ziegler, M, Maehara, H, Nishiyama, K, Kabashima, F, Bach, U, Bower, G. C, Falcone, A, Forster, J. R, Henden, A, Kawabata, K. S, Koubsky, P, Mukai, K, Nelson, T, Oates, S. R, Sakimoto, K, Sasada, M, Shenavrin, V. I, Shore, S. N, Skinner, G. K, Sokoloski, J, Stroh, M, Tatarnikov, A

    SCIENCE   329 ( 5993 ) 817 - 821  2010年08月  [査読有り]

    　概要を見る

    Novae are thermonuclear explosions on a white dwarf surface fueled by mass accreted from a companion star. Current physical models posit that shocked expanding gas from the nova shell can produce x-ray emission, but emission at higher energies has not been widely expected. Here, we report the Fermi Large Area Telescope detection of variable gamma-ray emission (0.1 to 10 billion electron volts) from the recently detected optical nova of the symbiotic star V407 Cygni. We propose that the material of the nova shell interacts with the dense ambient medium of the red giant primary and that particles can be accelerated effectively to produce pi(0) decay gamma-rays from proton-proton interactions. Emission involving inverse Compton scattering of the red giant radiation is also considered and is not ruled out.

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  • フェルミ衛星による活動銀河ジェット観測の新展開

    片岡 淳ほか

    日本天文学会誌   103   486  2010年08月

  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1)

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Br, dt T. J, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dermer C. D, de Palma F, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Fukazawa Y, Fukui Y, Funk S, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grove J. E, Guiriec S, Hadasch D, Hanabata Y, Harding A. K, Hays E, Horan D, Hughes R. E, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Rodriguez Y, Roth M, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Uchiyama Y, Uehara T, Usher T. L, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Yamamoto H, Yamazaki R, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   718 ( 1 ) 348 - 356  2010年07月  [査読有り]

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    (Scopus)

  • GeV gamma-ray flux upper limits from clusters of galaxies

    M. Ackermann, M. Ajello, A. Allafort, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, R. D. Blandford, P. Blasi, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, T. J. Brandt, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, E. Cavazzuti, C. Cecchi, Çelik, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, S. Colafrancesco, L. R. Cominsky, J. Conrad, C. D. Dermer, F. De Palma, E. Do Couto E Silva, P. S. Drell, R. Dubois, D. Dumora, Y. Edmonds, C. Farnier, C. Favuzzi, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, S. Guiriec, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, T. E. Jeltema, G. Jóhannesson, A. S. Johnson, T. J. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, S. H. Lee, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, A. Makeev, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli

    Astrophysical Journal Letters   717 ( 1 ) L71 - L78  2010年07月

    　概要を見る

    The detection of diffuse radio emission associated with clusters of galaxies indicates populations of relativistic leptons infusing the intraclustermedium (ICM). Those electrons and positrons are either injected into and accelerated directly in the ICM, or produced as secondary pairs by cosmic-ray ions scattering on ambient protons. Radiation mechanisms involving the energetic leptons together with the decay of neutral pions produced by hadronic interactions have the potential to produce abundant GeV photons. Here, we report on the search for GeV emission from clusters of galaxies using data collected by the Large Area Telescope on the FermiGamma-ray Space Telescope from 2008 August to 2010 February. Thirty-three galaxy clusters have been selected according to their proximity and high mass, X-ray flux and temperature, and indications of non-thermal activity for this study. We report upper limits on the photon flux in the range 0.2-100GeVtoward a sample of observed clusters (typical values (1-5)×10-9 photon cm-2 s-1) considering both point-like and spatially resolved models for the high-energy emission and discuss how these results constrain the characteristics of energetic leptons and hadrons, and magnetic fields in the ICM. The volume-averaged relativistic-hadron-to-thermal energy density ratio is found to be <5%-10% in several clusters.

    DOI

    Scopus

    153
    被引用数
    (Scopus)

  • フェルミガンマ線宇宙望遠鏡で探る微弱ガンマ線天体

    深沢 泰司, 片岡 淳, 高橋 忠幸, Behalf of the, Fermi LAT Collaboration

    天文月報   103 ( 8 ) 494 - 500  2010年07月

    CiNii

  • フェルミ衛星による活動銀河ジェット観測の新展開

    片岡 淳, 深沢 泰司, Stawarz Lukasz, 佐藤 理江, 林田 将明, Behalf of the, Fermi LAT Collaboration

    天文月報   103 ( 8 ) 486 - 493  2010年07月

    CiNii

  • FERMI OBSERVATIONS OF GRB 090510: A SHORT-HARD GAMMA-RAY BURST WITH AN ADDITIONAL, HARD POWER-LAW COMPONENT FROM 10 keV TO GeV ENERGIES

    Ackermann M, Asano K, Atwood W. B, Axelsson M, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bhat P. N, Bissaldi E, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Briggs M. S, Brigida M, Bruel P, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Connaughton V, Conrad J, Dermer C. D, de Palma F, Dingus B. L, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Finke J, Focke W. B, Frailis M, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Glanzman T, Godfrey G, Granot J, Grenier I. A, Grondin M. -H, Grove J. E, Guiriec S, Hadasch D, Harding A. K, Hays E, Horan D, Hughes R. E, Johannesson G, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Kippen R. M, Knoedlseder J, Kocevski D, Kouveliotou C, Kuss M, Lande J, Latronico L, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Mazziotta M. N, McEnery J. E, McGlynn S, Meegan C, Meszaros P, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Moretti E, Morselli A, Moskalenko I. V, Murgia S, Nakajima H, Nakamori T, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paciesas W. S, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Preece R, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Ritz S, Rodriguez A. Y, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Scargle J. D, Schalk T. L, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Stamatikos M, Stecker F. W, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Toma K, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Uehara T, Usher T. L, van der Horst A. J, Vasileiou V, Vilchez N, Vitale V, von Kienlin A, Waite A. P, Wang P, Wilson-Hodge C, Winer B. L, Wu X. F, Yamazaki R, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   716 ( 2 ) 1178 - 1190  2010年06月  [査読有り]

    DOI

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    352
    被引用数
    (Scopus)

  • SUZAKU OBSERVATIONS OF LUMINOUS QUASARS: REVEALING THE NATURE OF HIGH-ENERGY BLAZAR EMISSION IN LOW-LEVEL ACTIVITY STATES

    Abdo A. A, Ackermann M, Ajello M, Antolini E, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro G. A, Cameron R. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Chekhtman A, Chen A. W, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Colafrancesco S, Conrad J, Cutini S, Dermer C. D, de Palma F, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Frailis M, Fukazawa Y, Fusco P, Gargano F, Gasparrini D, Gehrels N, Giebels B, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grandi P, Grenier I. A, Guillemot L, Guiriec S, Hadasch D, Harding A. K, Hayashida M, Horan D, Hughes R. E, Itoh R, Jackson M. S, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Knoedlseder J, Kuss M, Lande J, Latronico L, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Mazziotta M. N, McEnery J. E, McGlynn S, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nestoras I, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Okumura A, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reyes L. C, Rodriguez A. Y, Roth M, Ryde F, Sadrozinski H. F. -W, Sambruna R, Sander A, Sato R, Sgro C, Shaw M. S, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Stawarz L, Stecker F. W, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibolla O, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vasileiou V, Vilchez N, Villata M, Vitale V, von Kienlin A, Waite A. P, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M, Tavecchio F, Sikora M, Schady P, Roming P, Chester M. M, Maraschi L

    ASTROPHYSICAL JOURNAL   716 ( 1 ) 835 - 849  2010年06月  [査読有り]

    DOI

    Scopus

    25
    被引用数
    (Scopus)

  • THE SPECTRAL ENERGY DISTRIBUTION OF FERMI BRIGHT BLAZARS

    Abdo A. A, Ackermann M, Agudo I, Ajello M, Aller H. D, Aller M. F, Angelakis E, Arkharov A. A, Axelsson M, Bach U, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Benitez E, Berdyugin A, Berenji B, Blandford R. D, Bloom E. D, Boettcher M, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Burrows D, Buson S, Caliandro G. A, Calzoletti L, Cameron R. A, Capalbi M, Caraveo P. A, Carosati D, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Charles E, Chaty S, Chekhtman A, Chen W. P, Chiang J, Chincarini G, Ciprini S, Claus R, Cohen-Tanugi J, Colafrancesco S, Cominsky L. R, Conrad J, Costamante L, Cutini S, D'ammando F, Deitrick R, D'Elia V, Dermer C. D, de Angelis A, de Palma F, Digel S. W, Donnarumma I, do Couto e, Silva E, Drell P. S, Dubois R, Dultzin D, Dumora D, Falcone A, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Forne E, Fortin P, Frailis M, Fuhrmann L, Fukazawa Y, Funk S, Fusco P, Gomez J. L, Gargano F, Gasparrini D, Gehrels N, Germani S, Giebels B, Giglietto N, Giommi P, Giordano F, Giuliani A, Glanzman T, Godfrey G, Grenier I. A, Gronwall C, Grove J. E, Guillemot L, Guiriec S, Gurwell M. A, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hays E, Healey S. E, Heidt J, Hiriart D, Horan D, Hoversten E. A, Hughes R. E, Itoh R, Jackson M. S, Johannesson G, Johnson A. S, Johnson W. N, Jorstad S. G, Kadler M, Kamae T, Katagiri H, Kataoka J, Kawai N, Kennea J, Kerr M, Kimeridze G, Knoedlseder J, Kocian M. L, Kopatskaya E. N, Koptelova E, Konstantinova T. S, Kovalev Y. Y, Kovalev Yu. A, Kurtanidze O. M, Kuss M, Lande J, Larionov V. M, Latronico L, Leto P, Lindfors E, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Marchegiani P, Marscher A. P, Marshall F, Max-Moerbeck W, Mazziotta M. N, McConville W, McEnery J. E, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nestoras I, Nilsson K, Nizhelsky N. A, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Ojha R, Omodei N, Orlando E, Ormes J. F, Osborne J, Ozaki M, Pacciani L, Padovani P, Pagani C, Page K, Paneque D, Panetta J. H, Parent D, Pasanen M, Pavlidou V, Pelassa V, Pepe M, Perri M, Pesce-Rollins M, Piranomonte S, Piron F, Pittori C, Porter T. A, Puccetti S, Rahoui F, Raino S, Raiteri C, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Richards J. L, Ritz S, Rochester L. S, Rodriguez A. Y, Romani R. W, Ros J. A, Roth M, Roustazadeh P, Ryde F, Sadrozinski H. F. -W, Sadun A, Sanchez D, Sander A, Parkinson P, M. Saz, Scargle J. D, Sellerholm A, Sgro C, Shaw M. S, Sigua L. A, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Stevenson M, Stratta G, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Takalo L. O, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vasileiou V, Verrecchia F, Vilchez N, Villata M, Vitale V, Waite A. P, Wang P, Winer B. L, Wood K. S, Ylinen T, Zensus J. A, Zhekanis G. V, Ziegler M

    ASTROPHYSICAL JOURNAL   716 ( 1 ) 30 - 70  2010年06月  [査読有り]

    DOI

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    809
    被引用数
    (Scopus)

  • FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Antolini E, Atwood W. B, Axelsson M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Belli F, Berenji B, Bisello D, Blandford R. D, Bloom E. D, Bonamente E, Bonnell J, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Busetto G, Buson S, Caliandro G. A, Cameron R. A, Campana R, Canadas B, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Ceccanti M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Cillis A. N, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Corbet R, Davis D. S, DeKlotz M, den Hartog P. R, Dermer C. D, de Angelis A, de Luca A, de Palma F, Digel S. W, Dormody M, do Couto E, Silva E, Drell P. S, Dubois R, Dumora D, Fabiani D, Farnier C, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giavitto G, Giebels B, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Gustafsson M, Hadasch D, Hanabata Y, Harding A. K, Hayashida M, Hays E, Healey S. E, Hill A. B, Horan D, Hughes R. E, Iafrate G, Johannesson G, Johnson A. S, Johnson R. P, Johnson T. J, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kocevski D, Kuss M, Lande J, Landriu D, Latronico L, Lee S. -H, Lemoine-Goumard M, Lionetto A. M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Marangelli B, Marelli M, Massaro E, Mazziotta M. N, McConville W, McEnery J. E, Michelson P. F, Minuti M, Mitthumsiri W, Mizuno T, Moiseev A. A, Mongelli M, Monte C, Monzani M. E, Moretti E, Morselli A, Moskalenko I. V, Murgia S, Nakajima H, Nakamori T, Naumann-Godo M, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paccagnella A, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Pinchera M, Piron F, Porter T. A, Poupard L, Raino S, Rando R, Ray P. S, Razzano M, Razzaque S, Rea N, Reimer A, Reimer O, Reposeur T, Ripken J, Ritz S, Rochester L. S, Rodriguez A. Y, Romani R. W, Roth M, Sadrozinski H. F. -W, Salvetti D, Sanchez D, Sander A, Parkinson P, M. Saz, Scargle J. D, Schalk T. L, Scolieri G, Sgro C, Shaw M. S, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Stephens T. E, Striani E, Strickman M. S, Strong A. W, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Tibolla O, Tinebra F, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Van Etten A, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wallace E, Wang P, Watters K, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   188 ( 2 ) 405 - 436  2010年06月  [査読有り]

    DOI

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    975
    被引用数
    (Scopus)

  • 大面積APDアレーの開発と次世代PET技術への展望

    片岡 淳

    放射線   35 ( 4 ) 277 - 287  2010年06月

    CiNii

  • 大面積APDアレーの開発と次世代PET技術への展望

    片岡 淳

    放射線（応用物理学会・放射線分科会）   35 ( 4 ) 277 - 287  2010年06月

    CiNii

  • THE FIRST CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Antolini E, Atwood W. B, Axelsson M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bogart J. R, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Cannon A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Celotti A, Charles E, Chekhtman A, Chen A. W, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Costamante L, Cotter G, Cutini S, D'Elia V, Dermer C. D, de Angelis A, de Palma F, De Rosa A, Digel S. W, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Escande L, Farnier C, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giebels B, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grandi P, Grenier I. A, Grondin M. -H, Grove J. E, Guiriec S, Hadasch D, Harding A. K, Hayashida M, Hays E, Healey S. E, Hill A. B, Horan D, Hughes R. E, Iafrate G, Itoh R, Johannesson G, Johnson A. S, Johnson R. P, Johnson T. J, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lavalley C, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Malaguti G, Massaro E, Mazziotta M. N, McConville W, McEnery J. E, McGlynn S, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piranomonte S, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Ripken J, Ritz S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sanchez D, Sander A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Shaw M. S, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Stawarz L, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Taylor G. B, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Ubertini P, Uchiyama Y, Usher T. L, Vasileiou V, Vilchez N, Villata M, Vitale V, Waite A. P, Wallace E, Wang P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   715 ( 1 ) 429 - 457  2010年05月  [査読有り]

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    469
    被引用数
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  • In-orbit performance of avalanche photodiode as radiation detector on board the picosatellite Cute-1.7+APD II

    Kataoka, J, Toizumi, T, Nakamroi, T, Yatsu, Y, Tsubuku, Y, Kuramoto, Y, Enomoto, T, Usui, R, Kawai, N, Ashida, H, Omagari, K, Fujihashi, K, Inagawa, S, Miura, Y, Konda, Y, Miyashita, N, Matsunaga, S, Ishikawa, Y, Matsunaga, Y, Kawabata, N

    Journal of Geophysical Research   115 ( 5 ) A05204 - (9pp)  2010年05月  [査読有り]

    DOI

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    40
    被引用数
    (Scopus)

  • Fermi Gamma-Ray Imaging of a Radio Galaxy

    SCIENCE   328 ( 5979 ) 725 - 729  2010年05月  [査読有り]

    DOI

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    215
    被引用数
    (Scopus)

  • Design of Tokyo Tech nano-satellite Cute-1.7+APD II and its operation

    Hiroki Ashida, Kota Fujihashi, Shinichi Inagawa, Yoshiyuki Miura, Kuniyuki Omagari, Naoki Miyashita, Saburo Matunaga, Takahiro Toizumi, Jun Kataoka, Nobuyuki Kawai

    Acta Astronautica   66 ( 9-10 ) 1412 - 1424  2010年05月

    　概要を見る

    Cute-1.7+APD II is the 3rd satellite developed by the Laboratory for Space Systems at the Tokyo Institute of Technology. Cute-1.7+APD II is the current successor to Cute-1.7+APD. This new satellite is based on its predecessor but has some modifications to increase its reliability and robustness against radiation effects, electrical power shortage and so on. The satellite was launched by an ISRO PSLV-C9 rocket on April 28, 2008 and has operated for more than 9 months. Throughout its operation, many missions such as attitude determination and control experiments, scientific observations, photographing and communication experiments have been conducted. In this paper an overview of the Cute-1.7 series and configurations, modifications and operation results of Cute-1.7+APD II are introduced. © 2009 Elsevier Ltd. All rights reserved.

    DOI

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    41
    被引用数
    (Scopus)

  • DETECTION OF THE ENERGETIC PULSAR PSR B1509-58 AND ITS PULSAR WIND NEBULA IN MSH 15-52 USING THE FERMI-LARGE AREA TELESCOPE

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Asano K, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Bruel P, Buson S, Caliandro G. A, Cameron R. A, Camilo F, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, den Hartog P. R, Dermer C. D, de Luca A, de Palma F, Dormody M, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giordano F, Glanzman T, Godfrey G, Gotthelf E. V, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hanabata Y, Harding A. K, Hays E, Hobbs G, Horan D, Hughes R. E, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Johnston S, Kamae T, Kanai Y, Kanbach G, Katagiri H, Kataoka J, Kawai N, Keith M, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Manchester R. N, Marelli M, Mazziotta M. N, McEnery J. E, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nolan P. L, Norris J. P, Nuss E, Ohno M, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Rea N, Reimer A, Reimer O, Reposeur T, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Thorsett S. E, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vasileiou V, Venter C, Vilchez N, Vitale V, Waite A. P, Wang P, Weltevrede P, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   714 ( 1 ) 927 - 936  2010年05月  [査読有り]

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    80
    被引用数
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  • FERMI-LARGE AREA TELESCOPE OBSERVATIONS OF THE EXCEPTIONAL GAMMA-RAY OUTBURSTS OF 3C 273 IN 2009 SEPTEMBER

    Abdo A. A, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Cannon A, Caraveo P. A, Carrigan S, Casandjian J. M, Cavazzuti E, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Costamante L, Dermer C. D, de Angelis A, de Palma F, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giommi P, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Guiriec S, Hayashida M, Hays E, Hill A. B, Horan D, Hughes R. E, Johannesson G, Johnson A. S, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Knoedlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Mansutti O, Massaro E, Mazziotta M. N, McConville W, McEnery J. E, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Paneque D, Panetta J. H, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Scargle J. D, Schalk T. L, Sgro C, Siskind E. J, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Vasileiou V, Vilchez N, Vitale V, Waite A. P, Wang P, Wehrle A. E, Winer B. L, Wood K. S, Yang Z, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL LETTERS   714 ( 1 ) L73 - L78  2010年05月  [査読有り]

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    47
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  • フェルミ衛星による電波銀河 NGC127のガンマ線スペクトル変動の観測

    J.Kataoka

    The Astrophysical Journal   715 ( 1 ) 554 - 560  2010年05月  [査読有り]

    DOI

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    54
    被引用数
    (Scopus)

  • THE VELA PULSAR: RESULTS FROM THE FIRST YEAR OF FERMI LAT OBSERVATIONS

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Atwood W. B, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Berenji B, Blandford D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dermer C. D, de Luca A, de Palma F, Dormody M, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giavitto G, Giebels B, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Harding A. K, Hays E, Hobbs G, Horan D, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Manchester R. N, Marelli M, Mazziotta M. N, McConville W, McEnery J. E, McGlynn S, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nolan P. L, Norris J. P, Noutsos A, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Rando R, Ray P. S, Razzano M, Reimer A, Reimer O, Reposeur T, Ritz S, Rochester L. S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Starck J. -L, Strickman M. S, Suson D. J, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Usher T. L, Van Etten A, Vasileiou V, Venter C, Vilchez N, Vitale V, Waite A. P, Wang P, Watters K, Weltevrede P, Winer B. L, Wood K. S, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   713 ( 1 ) 154 - 165  2010年04月  [査読有り]

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    114
    被引用数
    (Scopus)

  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE VELA-X PULSAR WIND NEBULA

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Chekhtman A, Chung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, de Angelis A, de Palma F, Dormody M, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gehrels N, Germani S, Giavitto G, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Harding A. K, Hayashida M, Hays E, Horan D, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Johnston S, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lee S. -H, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Makeev A, Marelli M, Mazziotta M. N, McEnery J. E, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nolan P. L, Norris J. P, Noutsos A, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Rando R, Ray P. S, Rea N, Reimer A, Reimer O, Reposeur T, Ritz S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sanchez D, Sander A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Van Etten A, Vasileiou V, Venter C, Vilchez N, Vitale V, Waite A. P, Wang P, Weltevrede P, Winer B. L, Wood K. S, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   713 ( 1 ) 146 - 153  2010年04月  [査読有り]

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    67
    被引用数
    (Scopus)

  • FERMI LARGE AREA TELESCOPE OBSERVATIONS OF PSR J1836+5925

    Abdo A. A, Ackermann M, Ajello M, Atwood B, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Bechtol K, Belfiore A, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Camilo F, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, de Angelis A, de Luca A, de Palma F, Digel S. W, Dormody M, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Edmonds Y, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Fortin P, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giavitto G, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Gwon C, Hadasch D, Harding A. K, Hays E, Horan D, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Johnson R. P, Johnson T. J, Johnson W. N, Kamae T, Kanai Y, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kuss M, Lande J, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Madejski G. M, Makeev A, Marelli M, Mazziotta M. N, McEnery J. E, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nolan P. L, Norris J. P, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Rando R, Ransom S. M, Ray P. S, Razzano M, Rea N, Reimer A, Reimer O, Reposeur T, Rochester L. S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Strickman M. S, Suson D. J, Takahashi H, Tanaka T, Thayer J. B, Thayer J. G, Thompson D. J, Thorsett S. E, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Usher T. L, Van Etten A, Vasileiou V, Venter C, Vilchez N, Vitale V, Waite A. P, Wang P, Watters K, Winer B. L, Wolff M. T, Wood K. S, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   712 ( 2 ) 1209 - 1218  2010年04月  [査読有り]

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    35
    被引用数
    (Scopus)

  • THE FIRST FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS

    Abdo A. A, Ackermann M, Ajello M, Atwood W. B, Axelsson M, Baldini L, Ballet J, Barbiellini G, Baring M. G, Bastieri D, Baughman B. M, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Camilo F, Caraveo P. A, Casandjian J. M, Cecchi C, Celik Oe, Charles E, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cognard I, Cohen-Tanugi J, Cominsky L. R, Conrad J, Corbet R, Cutini S, den Hartog P. R, Dermer C. D, de Angelis A, de Luca A, de Palma F, Digel S. W, Dormody M, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Espinoza C, Farnier C, Favuzzi C, Fegan S. J, Ferrara E. C, Focke W. B, Fortin P, Frailis M, Freire P. C. C, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giavitto G, Giebels B, Giglietto N, Giommi P, Giordano F, Glanzman T, Godfrey G, Gotthelf E. V, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Gwon C, Hanabata Y, Harding A. K, Hayashida M, Hays E, Hughes R. E, Jackson M. S, Johannesson G, Johnson A. S, Johnson R. P, Johnson T. J, Johnson W. N, Johnston S, Kamae T, Kanbach G, Kaspi V. M, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kocian M. L, Kramer M, Kuss M, Lande J, Latronico L, Lemoine-Goumard M, Livingstone M, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Lyne A. G, Madejski G. M, Makeev A, Manchester R. N, Marelli M, Mazziotta M. N, McConville W, McEnery J. E, McGlynn S, Meurer C, Michelson P. F, Mineo T, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nakamori T, Nolan P. L, Norris J. P, Noutsos A, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter T. A, Raino S, Rando R, Ransom S. M, Ray P. S, Razzano M, Rea N, Reimer A, Reimer O, Reposeur T, Ritz S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sanchez D, Sander A, Parkinson P, M. Saz, Scargle J. D, Schalk T. L, Sellerholm A, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Stappers B. W, Starck J. -L, Striani E, Strickman M. S, Strong A. W, Suson D. J, Tajima H, Takahashi H, Takahashi T, Tanaka T, Thayer J. B, Thayer J. G, Theureau G, Thompson D. J, Thorsett S. E, Tibaldo L, Tibolla O, Torres D. F, Tosti G, Tramacere A, Uchiyama Y, Usher T. L, Van Etten A, Vasileiou V, Venter C, Vilchez N, Vitale V, Waite A. P, Wang P, Wang N, Watters K, Weltevrede P, Winer B. L, Wood K. S, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   187 ( 2 ) 460 - 494  2010年04月  [査読有り]

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    449
    被引用数
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  • DISCOVERY OF PULSED gamma-RAYS FROM PSR J0034-0534 WITH THE FERMI LARGE AREA TELESCOPE: A CASE FOR CO-LOCATED RADIO AND gamma-RAY EMISSION REGIONS

    Abdo A. A, Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford R. D, Bloom E. D, Bonamente E, Borgland A. W, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Burnett T. H, Buson S, Caliandro G. A, Cameron R. A, Camilo F, Caraveo P. A, Carrigan S, Casandjian J. M, Cecchi C, Celik Oe, Chekhtman A, Cheung C. C, Chiang J, Ciprini S, Claus R, Cognard I, Cohen-Tanugi J, Conrad J, Corbet R, DeCesar M. E, Dermer C. D, Desvignes G, de Angelis A, de Palma F, Digel S. W, Dormody M, do Couto e, Silva E, Drell P. S, Dubois R, Dumora D, Espinoza C, Farnier C, Favuzzi C, Fegan S. J, Focke W. B, Frailis M, Freire P. C. C, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giavitto G, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier I. A, Grondin M. -H, Grove J. E, Guillemot L, Guiriec S, Hadasch D, Harding A. K, Hays E, Hobbs G, Horan D, Hughes R. E, Johannesson G, Johnson A. S, Johnson T. J, Johnson W. N, Johnston S, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kramer M, Kuss M, Lande J, Latronico L, Lemoine-Goumard M, Garde M. Llena, Longo F, Loparco F, Lott B, Lovellette M. N, Lubrano P, Lyne A. G, Makeev A, Manchester R. N, Marelli M, Mazziotta M. N, McConville W, McEnery J. E, McGlynn S, Meurer C, Michelson P. F, Mitthumsiri W, Mizuno T, Moiseev A. A, Monte C, Monzani M. E, Morselli A, Moskalenko I. V, Murgia S, Nolan P. L, Norris J. P, Noutsos A, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes J. F, Ozaki M, Paneque D, Panetta J. H, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Pierbattista M, Piron F, Porter T. A, Raino S, Rando R, Ransom S. M, Razzano M, Reimer A, Reimer O, Reposeur T, Ripken J, Ritz S, Rochester L. S, Rodriguez A. Y, Romani R. W, Roth M, Ryde F, Sadrozinski H. F. -W, Sander A, Parkinson P, M. Saz, Scargle J. D, Sgro C, Siskind E. J, Smith D. A, Smith P. D, Spandre G, Spinelli P, Stappers B. W, Starck J. -L, Strickman M. S, Suson D. J, Takahashi H, Tanaka T, Thayer J. B, Thayer J. G, Theureau G, Thompson D. J, Thorsett S. E, Tibaldo L, Torres D. F, Tosti G, Tramacere A, Usher T. L, Van Etten A, Vasileiou V, Venter C, Vilchez N, Vitale V, Waite A. P, Wallace E, Wang P, Weltevrede P, Winer B. L, Wood K. S, Ylinen T, Ziegler M

    ASTROPHYSICAL JOURNAL   712 ( 2 ) 957 - 963  2010年04月  [査読有り]

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    54
    被引用数
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  • VLBI Monitoring of 3C 84 (NGC 1275) in Early Phase of the 2005 Outburst

    Hiroshi Nagai, Kenta Suzuki, Keiichi Asada, Motoki Kino, Seiji Kameno, Akihiro Doi, Makoto Inoue, Jun Kataoka, Uwe Bach, Tomoya Hirota, Naoko Matsumoto, Mareki Honma, Hideyuki Kobayashi, Kenta Fujisawa

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   62 ( 2 ) L11 - L15  2010年04月  [査読有り]

    　概要を見る

    Multi-epoch Very Long Baseline Interferometry (VLBI) study of a sub-pc scale jet of 3C 84 is presented. We carried out 14-epoch VLBI observations during 2006-2009 with the Japanese VLBI Network and the VLBI Exploration of Radio Astrometry, immediately following a radio outburst that began in 2005. We confirmed that the outburst was associated with the central similar to 1 pc core, accompanying the emergence of a new component. This is striking evidence of the recurrence of jet activity. The new component became brighter during 2008, in contrast to constant gamma-ray emission that was observed with the Fermi Gamma-ray Space Telescope during the same time. We found that the projected speed of the new component was 0.23c from 2007/297 (2007 October 24) to 2009/114 (2009 April 24). The direction of movement of this component differs from that of the pre-existing component by similar to 40 degrees. This was the first measurement of the kinematics of a sub-pc jet in a gamma-ray active phase. A possible detection of jet deceleration and the jet kinematics in connection with the gamma-ray emission is discussed.