2026/01/17 更新

写真a

ハヤツ　ナツキ
早津　夏己
所属
理工学術院 理工学術院総合研究所
職名
次席研究員（研究院講師）

経歴

  • 2025年04月
    -
    継続中

    早稲田大学   理工学術院   次席研究員

    受け入れ研究者：井上 昭雄，2025年4月〜7月 産前・産後休暇を取得

  • 2022年09月
    -
    2025年03月

    国立天文台   天文情報センター 石垣島天文台   特任研究員

    受け入れ研究者：花山 秀和

  • 2022年05月
    -
    2022年08月

    ヨーロッパ南天天文台   訪問研究員

    Host Researcher: Paola Andreani

  • 2020年09月
    -
    2022年08月

    パリ高等師範学校   プロジェクト研究員

    Host researcher: Edith Falgarone

  • 2020年04月
    -
    2021年03月

    国立天文台   特別訪問研究員

    受け入れ研究者：齋藤 正雄

  • 2020年06月
    -
    2020年08月

    文教大学   嘱託研究員

    受け入れ研究者：長島 雅裕

  • 2017年10月
    -
    2019年03月

    ヨーロッパ南天天文台   スチューデントフェロー

    Host Researcher: Rob Ivison, Paola Andreani

  • 2017年02月
    　
    　

    国立天文台   アルマプロジェクト   訪問研究員

    受け入れ研究者：松田 有一, ID: T1620

  • 2016年02月
    　
    　

    ダーラム大学   訪問研究員

    Host Researcher: Ian Smail, three weeks

  • 2015年08月
    　
    　

    国立天文台   アルマプロジェクト   訪問研究員

    受け入れ研究者：松田 有一, ID: T1510

  • 2012年03月
    　
    　

    国立天文台   アルマプロジェクト   訪問研究員

    受け入れ研究者：松田 有一, ID: T1210

▼全件表示

学歴

  • 2015年04月
    -
    2020年03月

    東京大学   大学院理学系研究科   物理学専攻（博士課程）  

    ヨーロッパ南天天文台にて，常勤研究員としての職務を兼任（一年半）。

  • 2012年04月
    -
    2015年03月

    東京大学   大学院理学系研究科   物理学専攻（修士課程）  

  • 2008年04月
    -
    2012年03月

    日本大学   理工学部   物理学科  

  • 2004年04月
    -
    2007年03月

    都立戸山高等学校  

委員歴

  • 2025年01月
    -
    2026年03月

    Workshop "Star Forming Galaxies in the Reionization Epoch: ALMA-Driven Studies with the Aid of JWST"  Organiser (SOC, LOC)

  • 2014年01月
    -
    2014年07月

    天文・天体物理若手の会  LOC（会場係 係長）、SOC

所属学協会

  • 2015年12月
    -
    継続中

    日本天文学会

研究分野

  • 天文学   遠赤外線銀河、輝線銀河、宇宙星形成史、銀河形成

研究キーワード

  • 遠赤外線輝線銀河

  • 銀河形成

  • 星形成史

受賞

  • 国立天文台長賞

    2024年01月   国立天文台   地域連携による安定運用および広報・教育普及と科学研究への継続的な貢献  

    受賞者： 石垣島天文台を連携して運営する団体(特任研究員として所属)

 

論文

  • Serendipitous discovery of an optically dark ultra-luminous infrared galaxy at z = 3.4

    Natsuki H Hayatsu, Zhi-Yu Zhang, R J Ivison, Chao-Wei Tsai, Ping Zhou, Katsuya Okoshi, Chentao Yang, Yuri Nishimura, Kotaro Kohno, Nobunari Kashikawa, Masahiro Nagashima, Junfeng Wang, Denis Burgarella

    Monthly Notices of the Royal Astronomical Society    2025年10月

    　概要を見る

    Dusty, submillimeter-selected galaxies without optical counterparts contribute a non-negligible fraction of the star formation in the early universe. However, such a population is difficult to detect through classical optical/UV-based surveys. We report the serendipitous discovery of such an optically dark galaxy, behind the quadruply-lensed $z=2.56$ quasar, H1413+117, offset to the north by 6\arcsec. From $^{12}$CO $J=4$--3, $J=6$--5, and part of the $J=13$--12 transitions, which all spatially coincide with a compact submillimeter continuum emission, we determine an unambiguous spectroscopic redshift, $z=3.386\pm 0.005$. This galaxy has a molecular mass $M_{\rm mol} \sim 10^{11}$ M$_\odot$ and a black hole mass $M_{\rm BH} \sim 10^{8}$ M$_\odot$, estimated from $^{12}$CO $J=4$--3 and archival {\it Chandra} X-ray data ($L_{\rm 2-10,keV} \sim 4 \times 10^{44}$\,erg\,s$^{-1}$), respectively. We also estimate a total infrared luminosity of $L_{\rm FIR} = (2.8\pm{2.3}) \times 10^{12}$ L$_\odot$ and a stellar mass of $M_* \lesssim 10^{11}$ M$_{\odot}$, from spectral energy distribution fitting. According to these simple mass estimations, this gas-rich and X-ray bright galaxy might be in a transition phase from starburst to quasar offering a unique case for studying galaxy-black hole co-evolution under extremely dusty conditions.

    DOI

    Scopus

  • ALMA deep field in SSA22: Reconstructed [C II] luminosity function at z = 6

    Hayatsu, Natsuki H, Ivison, Rob J, Andreani, Paola, Guglielmetti, Fabrizia, Zhang, Zhi-Yu, Biggs, Andy, Umehata, Hideki, Matsuda, Yuichi, Yoshida, Naoki, Swinbank, Mark A, Kohno, Kotaro, Tamura, Yoichi, Hatsukade, Bunyo, Nakanishi, Kouichiro, Ao, Yiping, Nagao, Tohru, Kubo, Mariko, Takeuchi, Tsutomu T, Lee, Minju, Izumi, Takuma, Ikarashi, Soh, Yamada, Tohru

    \pasj    2024年10月

    DOI

    Scopus

  • FIR-luminous [C II] Emitters in the ALMA-SCUBA-2 COSMOS Survey (AS2COSMOS): The Nature of Submillimeter Galaxies in a 10 Comoving Megaparsec-scale Structure at z \ensuremath∼ 4.6

    Mitsuhashi, I., Matsuda, Y., Smail, Ian, Hayatsu, N.~H., Simpson, J.~M., Swinbank, A.~M., Umehata, H., Dudzevičiūtė, U., Birkin, J.~E., Ikarashi, S., Chen, Chian-Chou, Tadaki, K., Yajima, H., Harikane, Y., Inami, H., Chapman, S.~C., Hatsukade, B., Iono, D., Bunker, A., Ao, Y., Saito, T., Ueda, J., Sakamoto, S.

    \apj   907 ( 2 ) 122 - 122  2021年02月

    　概要を見る

    We report the discovery of a 10 comoving Mpc-scale structure traced by massive submillimeter galaxies (SMGs) at z~4.6. These galaxies are selected from an emission line search of ALMA Band 7 observations targeting 184 luminous submillimeter sources ($S_{850μ{\rm m } }\geq$ 6.2 mJy) across 1.6 degrees$^2$ in the COSMOS field. We identify four [CII] emitting SMGs and two probable [CII] emitting SMG candidates at z=4.60-4.64 with velocity-integrated signal-to-noise ratio of SNR>8. Four of the six emitters are near-infrared blank SMGs. After excluding one SMG whose emission line is falling at the edge of the spectral window, all galaxies show clear velocity gradients along the major axes that are consistent with rotating gas disks. The estimated rotation velocities of the disks are 330-550 km s$^{-1}$ and the inferred host dark-matter halo masses are ~2-8 $\times$ 10$^{12}$M$_{\odot}$. From their estimated halo masses and [CII] luminosity function, we suggest that these galaxies have a high (50-100%) duty cycle and high (~0.1) baryon conversion efficiency (SFR relative to baryon accretion rate), and that they contribute $\simeq$2% to the total star-formation rate density at z=4.6. These SMGs are concentrated within just 0.3% of the full survey volume, suggesting they are strongly clustered. The extent of this structure and the individual halo masses suggest that these SMGs will likely evolve into members of a ~10$^{15}$M$_{\odot}$ cluster at z=0. This survey reveals synchronized dusty starburst in massive halos at z>4, which could be driven by mergers or fed by smooth gas accretion.

    DOI

    Scopus

    17
    被引用数
    (Scopus)

  • ALMA Deep Field in SSA22. A near-infrared-dark submillimeter galaxy at z = 4.0

    Umehata, Hideki, Smail, Ian, Swinbank, A.~M., Kohno, Kotaro, Tamura, Yoichi, Wang, Tao, Ao, Yiping, Hatsukade, Bunyo, Kubo, Mariko, Nakanishi, Kouchiro, Hayatsu, Natsuki N.

    åp    2020年08月

    DOI

    Scopus

    28
    被引用数
    (Scopus)

  • ALMA twenty-six arcmin$^2$ survey of GOODS-S at one millimeter (ASAGAO): Millimeter properties of stellar mass selected galaxies

    Yamaguchi, Yuki, Kohno, Kotaro, Hatsukade, Bunyo, Wang, Tao, Yoshimura, Yuki, Ao, Yiping, Dunlop, James S., Egami, Eiichi, Espada, Daniel, Fujimoto, Seiji, Hayatsu, Natsuki H., Ivison, Rob J., Kodama, Tadayuki, Kusakabe, Haruka, Nagao, Tohru, Ouchi, Masami, Rujopakarn, Wiphu, Tadaki, Ken-ichi, Tamura, Yoichi, Ueda, Yoshihiro, Umehata, Hideki, Wang, Wei-Hao

    \pasj   72 ( 4 ) 69 - 69  2020年08月

    DOI

    Scopus

    6
    被引用数
    (Scopus)

  • The correct estimate of the probability of false detection of the matched filter in weak-signal detection problems. III. Peak distribution method versus the Gumbel distribution method

    Vio, R., Andreani, P., Biggs, A., Hayatsu, N.

    åp    2019年07月

    DOI

    Scopus

    8
    被引用数
    (Scopus)

  • ADF22: Blind Detections of [C\,II] Line Emitters Shown to be Spurious

    Hayatsu, Natsuki H., Ivison, R.~J., Andreani, Paola, Umehata, Hideki, Matsuda, Yuichi, Yoshida, Naoki, Kohno, Kotaro, Hatsukade, Bunyo, Inoue, Akio K., Tamura, Yoichi, Takeuchi, Tutomu T., Fujimoto, Seiji, Lee, Minju M., Nagao, Tohru, Ao, Yiping

    Research Notes of the American Astronomical Society   3 ( 7 ) 97 - 97  2019年07月

    　概要を見る

    We report Atacama Large Millimetre/submillimeter Array (ALMA) Cycle-5 follow-up observations of two candidate [CII] emitters at z ~ 6 in the ALMA deep field in SSA22 (ADF22). The candidates were detected blindly in a Cycle-2 ALMA survey covering ~ 5 square arcmins, with a single tuning, along with two CO lines associated with galaxies at lower redshifts. Various tests suggested at least one of the two > 6-sigma [CII] candidates should be robust (Hayatsu et al. 2017). Nevertheless, our new, deeper observations recover neither candidate, demonstrating a higher contamination rate than expected. The cause of the spurious detections is under investigation but at present it remains unclarified.

    DOI

  • ALMA 26 arcmin$^2$ Survey of GOODS-S at 1 mm (ASAGAO): Near-infrared-dark Faint ALMA Sources

    Yamaguchi, Yuki, Kohno, Kotaro, Hatsukade, Bunyo, Wang, Tao, Yoshimura, Yuki, Ao, Yiping, Caputi, Karina I., Dunlop, James S., Egami, Eiichi, Espada, Daniel, Fujimoto, Seiji, Hayatsu, Natsuki H., Ivison, Rob J., Kodama, Tadayuki, Kusakabe, Haruka, Nagao, Tohru, Ouchi, Masami, Rujopakarn, Wiphu, Tadaki, Ken-ichi, Tamura, Yoichi, Ueda, Yoshihiro, Umehata, Hideki, Wang, Wei-Hao, Yun, Min S.

    \apj   878 ( 1 ) 73 - 73  2019年06月

    DOI

    Scopus

    63
    被引用数
    (Scopus)

  • ALMA twenty-six arcmin$^2$ survey of GOODS-S at one millimeter (ASAGAO): Source catalog and number counts

    Hatsukade, Bunyo, Kohno, Kotaro, Yamaguchi, Yuki, Umehata, Hideki, Ao, Yiping, Aretxaga, Itziar, Caputi, Karina I., Dunlop, James S., Egami, Eiichi, Espada, Daniel, Fujimoto, Seiji, Hayatsu, Natsuki H., Hughes, David H., Ikarashi, Soh, Iono, Daisuke, Ivison, Rob J., Kawabe, Ryohei, Kodama, Tadayuki, Lee, Minju, Matsuda, Yuichi, Nakanishi, Kouichiro, Ohta, Kouji, Ouchi, Masami, Rujopakarn, Wiphu, Suzuki, Tomoko, Tamura, Yoichi, Ueda, Yoshihiro, Wang, Tao, Wang, Wei-Hao, Wilson, Grant W., Yoshimura, Yuki, Yun, Min S.

    \pasj   70 ( 6 ) 105 - 105  2018年12月

    DOI

    Scopus

    37
    被引用数
    (Scopus)

  • ALMA deep field in SSA22: Survey design and source catalog of a 20 arcmin$^2$ survey at 1.1 mm

    Umehata, Hideki, Hatsukade, Bunyo, Smail, Ian, Alexander, David M., Ivison, Rob J., Matsuda, Yuichi, Tamura, Yoichi, Kohno, Kotaro, Kato, Yuta, Hayatsu, Natsuki H., Kubo, Mariko, Ikarashi, Soh

    \pasj   70 ( 4 ) 65 - 65  2018年08月

    DOI

    Scopus

    32
    被引用数
    (Scopus)

  • The onset of star formation 250 million years after the Big Bang

    Hashimoto, Takuya, Laporte, Nicolas, Mawatari, Ken, Ellis, Richard S., Inoue, Akio K., Zackrisson, Erik, Roberts-Borsani, Guido, Zheng, Wei, Tamura, Yoichi, Bauer, Franz E., Fletcher, Thomas, Harikane, Yuichi, Hatsukade, Bunyo, Hayatsu, Natsuki H., Matsuda, Yuichi, Matsuo, Hiroshi, Okamoto, Takashi, Ouchi, Masami, Pelló, Roser, Rydberg, Claes-Erik, Shimizu, Ikkoh, Taniguchi, Yoshiaki, Umehata, Hideki, Yoshida, Naoki

    \nat   557 ( 7705 )  2018年05月

    DOI

    Scopus

    305
    被引用数
    (Scopus)

  • ALMA 26 arcmin$^2$ Survey of GOODS-S at One-millimeter (ASAGAO): X-Ray AGN Properties of Millimeter-selected Galaxies

    Ueda, Y., Hatsukade, B., Kohno, K., Yamaguchi, Y., Tamura, Y., Umehata, H., Akiyama, M., Ao, Y., Aretxaga, I., Caputi, K., Dunlop, J.~S., Espada, D., Fujimoto, S., Hayatsu, N.~H., Imanishi, M., Inoue, A.~K., Ivison, R.~J., Kodama, T., Lee, M.~M., Matsuoka, K., Miyaji, T., Morokuma-Matsui, K., Nagao, T., Nakanishi, K., Nyland, K., Ohta, K., Ouchi, M., Rujopakarn, W., Saito, T., Tadaki, K., Tanaka, I., Taniguchi, Y., Wang, T., Wang, W.-H., Yoshimura, Y., Yun, M.~S.

    \apj   853 ( 1 ) 24 - 24  2018年01月

    DOI

    Scopus

    36
    被引用数
    (Scopus)

  • Blind Millimeter Line Emitter Search using ALMA Data Toward Gravitational Lensing Clusters

    Yamaguchi, Yuki, Kohno, Kotaro, Tamura, Yoichi, Oguri, Masamune, Ezawa, Hajime, Hayatsu, Natsuki H., Kitayama, Tetsu, Matsuda, Yuichi, Matsuo, Hiroshi, Oshima, Tai, Ota, Naomi, Izumi, Takuma, Umehata, Hideki

    \apj   845 ( 2 ) 108 - 108  2017年08月

    DOI

    Scopus

    19
    被引用数
    (Scopus)

  • ALMA deep field in SSA22: Blindly detected CO emitters and [C II] emitter candidates

    Hayatsu, Natsuki H., Matsuda, Yuichi, Umehata, Hideki, Yoshida, Naoki, Smail, Ian, Swinbank, A. Mark, Ivison, Rob, Kohno, Kotaro, Tamura, Yoichi, Kubo, Mariko, Iono, Daisuke, Hatsukade, Bunyo, Nakanishi, Kouichiro, Kawabe, Ryohei, Nagao, Tohru, Inoue, Akio K., Takeuchi, Tsutomu T., Lee, Minju, Ao, Yiping, Fujimoto, Seiji, Izumi, Takuma, Yamaguchi, Yuki, Ikarashi, Soh, Yamada, Toru

    \pasj   69 ( 3 ) 45 - 45  2017年06月

    DOI

    Scopus

    24
    被引用数
    (Scopus)

▼全件表示

書籍等出版物

Misc

  • LIGO/Virgo/KAGRA S240422ed: Further near-infrared observations with Subaru/MOIRCS by J-GEM Collaboration

    Morokuma, Tomoki, Tominaga, Nozomu, Yanagisawa, Kenshi, Tanaka, Ichi, Yoshida, Michitoshi, Matsubayashi, Kazuya, Akitaya, Hiroshi, Hamada, Ryusei, Suzuki, Daisuke, Higuchi, Narikazu, Sasada, Mahito, Seki, Hibiki, Takahashi, Ichiro, Joshima, Shigeaki, Hagio, Haruna, Kubo, Yoshiyuki, Honda, Satoshi, Takahashi, Jun, Ohshima, Tomohito, Kawabata, Koji, Nakaoka, Tatsuya, Itoh, Ryosuke, Kokubo, Mitsuru, Hayatsu, Natsuki, Hanayama, Hidekazu, Kanai, Takahiro, Oasa, Yumiko, Murata, Katsuhiro L., Taguchi, Kenta, Ohta, Kouji, Kawabata, Miho, Maeda, Keiichi, Kusune, Takayoshi, Niino, Yuu, Sekiguchi, Yuichiro, Tanaka, Masaomi, Utsumi, Yousuke, Japanese Collaboration for Gravitational-Wave Electro-Magnetic Follow-up Collaboration

    GRB Coordinates Network   36302   1 - 1  2024年04月

  • LIGO/Virgo/KAGRA S240422ed: A transient discovered from Subaru/MOIRCS near-infrared observations by J-GEM Collaboration

    Takahashi, Ichiro, Higuchi, Narikazu, Sasada, Mahito, Morokuma, Tomoki, Tominaga, Nozomu, Yanagisawa, Kenshi, Tanaka, Ichi, Yoshida, Michitoshi, Matsubayashi, Kazuya, Akitaya, Hiroshi, Hamada, Ryusei, Suzuki, Daisuke, Seki, Hibiki, Joshima, Shigeaki, Hagio, Haruna, Kubo, Yoshiyuki, Honda, Satoshi, Takahashi, Jun, Ohshima, Tomohito, Kawabata, Koji, Nakaoka, Tatsuya, Itoh, Ryosuke, Kokubo, Mitsuru, Hayatsu, Natsuki, Hanayama, Hidekazu, Kanai, Takahiro, Oasa, Yumiko, Murata, Katsuhiro L., Taguchi, Kenta, Ohta, Kouji, Kawabata, Miho, Maeda, Keiichi, Kusune, Takayoshi, Niino, Yuu, Sekiguchi, Yuichiro, Tanaka, Masaomi, Utsumi, Yousuke, Japanese Collaboration for Gravitational-Wave Electro-Magnetic Follow-up, Collaboration

    GRB Coordinates Network   36333   1 - 1  2024年04月

  • GRB 230723B: MITSuME Ishigaki optical observation

    Hayatsu, N.~H., Hanayama, H., Sasada, M., Takahashi, I., Niwano, M., Sato, S., Hayatsu, S., Higuchi, N., Takei, H., Seki, H., Yatsu, Y., Murata, K.~L., Kawai, N., MITSuME Collaboration

    GRB Coordinates Network   34295   1 - 1  2023年07月

 

現在担当している科目

担当経験のある科目(授業)

  • 理工学基礎実験１Ｂ IIIブロック

    早稲田大学  

    2025年10月
    -
    2026年02月
     

    　概要を見る

    基幹理工学部，創造理工学部，先進理工学部。「発表と討論」のファシリテーションおよび評価，レポート評価を担当。

  • 現代科学

    東京理科大学  

    2025年09月
    -
    2026年01月
     

    　概要を見る

    ゼミ形式で輪読を行う。レジュメやゼミへの貢献度をもとに評価。

  • 教養演習

    東京理科大学  

    2025年09月
    -
    2026年01月
     

    　概要を見る

    ゼミ形式で輪読を行う。レジュメやゼミへの貢献度をもとに評価。

 

社会貢献活動

他学部・他研究科等兼任情報

  • 理工学術院   先進理工学部