Updated on 2023/09/21

写真a

 
KOKUSHO Takuma
 
Organization
Graduate School of Science Lecturer
Graduate School
Graduate School of Science
Undergraduate School
School of Science Department of Physics
Title
Lecturer

Degree 1

  1. 博士(理学) ( 2017.3   名古屋大学 ) 

Research Areas 1

  1. Natural Science / Astronomy

Current Research Project and SDGs 2

  1. Development of a new interferometer for evaluation of free-form mirrors at cryogenic temperatures

  2. Development of the IRSF spectrometer for near-infrared spectral mapping of the Large Magellanic Cloud

Education 1

  1. Nagoya University   Graduate School, Division of Natural Science

    - 2017.3

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    Country: Japan

Professional Memberships 1

  1. 日本天文学会

 

Papers 40

  1. Properties of Star Formation of the Large Magellanic Cloud As Probed by Young Stellar Objects Reviewed

    Takuma Kokusho, Hiroki Torii, Hidehiro Kaneda, Yasuo Fukui, Kengo Tachihara

    The Astrophysical Journal   Vol. 953 ( 1 ) page: 104 - 104   2023.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    We perform a systematic study of the evolutionary stages and stellar masses of young stellar objects (YSOs) in the Large Magellanic Cloud (LMC) to investigate the properties of star formation in the galaxy. There are 4825 sources in our YSO sample, which are constructed by combining the previous studies identifying YSOs in the LMC. Spectral energy distributions of the YSOs from optical to infrared wavelengths were fitted with a model consisting of stellar, polycyclic aromatic hydrocarbon, and dust emissions. We utilize the stellar-to-dust luminosity ratios thus derived to study the evolutionary stages of the sources; younger YSOs are expected to show lower stellar-to-dust luminosity ratios. We find that most of the YSOs are associated with the interstellar gas across the galaxy, which are younger with more gas, suggesting that more recent star formation is associated with larger amounts of the interstellar medium (ISM). N157 shows a hint of higher stellar-to-dust luminosity ratios between active star-forming regions in the LMC, suggesting that recent star formation in N157 is possibly in later evolutionary stages. We also find that the stellar mass function tends to be bottom-heavy in supergiant shells (SGSs), indicating that gas compression by SGSs may be ineffective in compressing the ISM enough to trigger massive star formation. There is no significant difference in the stellar mass function between YSOs likely associated with the interface between colliding SGSs and those with a single SGS, suggesting that gas compression by collisions between SGSs may also be ineffective for massive star formation.

    DOI: 10.3847/1538-4357/ace10e

    Web of Science

    Other Link: https://iopscience.iop.org/article/10.3847/1538-4357/ace10e/pdf

  2. Spitzer/IRS full spectral modeling to characterize mineralogical properties of silicate dust in heavily obscured AGNs Reviewed

    Tsuchikawa, T., Kaneda, H., Oyabu, S., Kokusho, T., Kobayashi, H., Toba, Y.

    Astronomy & Astrophysics     2022.10

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    Language:English  

  3. Three-dimensional geometry and dust/gas ratios in massive star-forming regions over the entire LMC as revealed by the IRSF/SIRIUS survey

    FURUTA Takuya, KANEDA Hidehiro, KOKUSHO Takuma, NAKAJIMA Yasushi, FUKUI Yasuo, TSUGE Kisetsu

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 74 ( 3 ) page: 639 - 655   2022.6

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    Language:Japanese  

    DOI: 10.1093/pasj/psac025

    Web of Science

  4. Three-dimensional geometry and dust/gas ratios in massive star forming regions over the entire LMC as revealed by IRSF/SIRIUS survey Reviewed

    Furuta, Takuya ; Kaneda, Hidehiro ; Kokusho, Takuma ; Nakajima, Yasushi ; Fukui, Yasuo ; Tsuge, Kisetsu

    Publications of the Astronomical Society of Japan     2022.3

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    Language:English  

  5. Infrared Absorption and Its Sources of CdZnTe at Cryogenic Temperature Reviewed

    Maeshima Hiroshi, Matsumoto Kosei, Hirahara Yasuhiro, Nakagawa Takao, Koga Ryoichi, Hanamura Yusuke, Wada Takehiko, Nagase Koichi, Oyabu Shinki, Suzuki Toyoaki, Kokusho Takuma, Kaneda Hidehiro, Ishikawa Daichi

    JOURNAL OF ELECTRONIC MATERIALS   Vol. 51 ( 2 ) page: 564 - 576   2022.2

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  6. Investigation of the Physical Origin of Overionized Recombining Plasma in the Supernova Remnant IC 443 with XMM-Newton Reviewed

    Okon Hiromichi, Tanaka Takaaki, Uchida Hiroyuki, Tsuru Takeshi Go, Seta Masumichi, Kokusho Takuma, Smith Randall K.

    ASTROPHYSICAL JOURNAL   Vol. 921 ( 2 )   2021.11

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    Language:English  

    DOI: 10.3847/1538-4357/ac1e2c

    Web of Science

  7. Three-dimensional dust geometry of the LMC H I ridge region as revealed by the IRSF/SIRIUS survey Reviewed

    Furuta, Takuya ; Kaneda, Hidehiro ; Kokusho, Takuma ; Nakajima, Yasushi ; Fukui, Yasuo ; Tsuge, Kisetsu

    Publications of the Astronomical Society of Japan   Vol. 73 ( 4 ) page: 864 - 879   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/pasj/psab052

  8. A systematic study of silicate absorption features in heavily obscured AGNs observed by Spitzer/IRS Reviewed

    Tsuchikawa T., Kaneda H., Oyabu S., Kokusho T., Kobayashi H., Yamagishi M., Toba Y.

    ASTRONOMY & ASTROPHYSICS   Vol. 651   2021.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1051/0004-6361/202140483

    Web of Science

  9. SPICA Mid-infrared Instrument (SMI): The latest design and specifications

    Wada, Takehiko; Kaneda, Hidehiro; Kokusho, Takuma; Suzuki, Toyoaki; Morihana, Kumiko; Tsuchikawa, Takurou; Kuroda, Yuki; Ishikawa, Daichi; Oyabu, Shinki; Isobe, Naoki; Ishihara, Daisuke; Matsuhara, Hideo; Nagase, Koichi; Nakagawa, Takao; Ootsubo, Takafumi; Yamagishi, Mitsuyoshi; Maeshima, Hiroshi; Onishi, Shunsuke; Matsumoto, Kosei; Itoh, Satoshi

    Proceedings of the SPIE   Vol. 11443   2020.11

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    Language:English  

    DOI: 10.1117/12.2561157

  10. Transmittance measurement of low/high-resistivity of CdZnTe at cryogenic temperature for material selection of the immersion grating of SPICA SMI

    Maeshima, Hiroshi; Matsumoto, Kosei; Hirahara, Yasuhiro; Nakagawa, Takao; Wada, Takehiko; Nagase, Koichi; Oyabu, Shinki; Suzuki, Toyoaki; Kokusho, Takuma; Kaneda, Hidehiro; Ito, Ryota; Ishikawa, Daichi

    Proceedings of the SPIE   Vol. 11451   2020.11

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    Language:English  

    DOI: 10.1117/12.2562042

  11. Hydrogen recombination near-infrared line mapping of Centaurus A with IRSF/SIRIUS Reviewed

    Katayama Risako, Kaneda Hidehiro, Kokusho Takuma, Morihana Kumiko, Suzuki Toyoaki, Oyabu Shinki, Yamagishi Mitsuyoshi, Tsuchikawa Takuro

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 72 ( 5 )   2020.10

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    Language:English  

    DOI: 10.1093/pasj/psaa081

    Web of Science

  12. Hydrogen recombination near-infrared line mapping of Centaurus A with IRSF/SIRIUS (vol 72, pg 88, 2020) Reviewed

    Katayama Risako, Kaneda Hidehiro, Kokusho Takuma, Morihana Kumiko, Suzuki Toyoaki, Oyabu Shinki, Yamagishi Mitsuyoshi, Tsuchikawa Takuro

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 72 ( 5 )   2020.10

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    Language:English  

    DOI: 10.1093/pasj/psaa094

    Web of Science

  13. Near-infrared [Fe II] and H2 Line Mapping of the Supernova Remnant IC 443 with the IRSF/SIRIUS Reviewed

    Kokusho Takuma, Torii Hiroki, Nagayama Takahiro, Kaneda Hidehiro, Sano Hidetoshi, Ishihara Daisuke, Onaka Takashi

    ASTROPHYSICAL JOURNAL   Vol. 899 ( 1 )   2020.8

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    Language:English  

    DOI: 10.3847/1538-4357/ab9cb3

    Web of Science

  14. Pixel-based Spectral Characterization of Mid-infrared Si Array Detectors for Astronomical Observations in Space Reviewed

    Tsuchikawa Takuro, Kaneda Hidehiro, Ishihara Daisuke, Kokusho Takuma, Wada Takehiko

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC   Vol. 132 ( 1013 )   2020.7

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    Language:English  

    DOI: 10.1088/1538-3873/ab8aa8

    Web of Science

  15. A systematic study of Galactic infrared bubbles along the Galactic plane with AKARI and Herschel. II. Spatial distributions of dust components around the bubbles Reviewed

    Hanaoka Misaki, Kaneda Hidehiro, Suzuki Toyoaki, Kokusho Takuma, Oyabu Shinki, Ishihara Daisuke, Kohno Mikito, Furuta Takuya, Tsuchikawa Takurou, Saito Futoshi

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 72 ( 1 )   2020.2

  16. Extinction and dust/gas ratio in the Hi ridge region of the LMC based on the IRSF/SIRIUS near-infrared survey Reviewed

    Furuta Takuya, Kaneda Hidehiro, Kokusho Takuma, Ishihara Daisuke, Nakajima Yasushi, Fukui Yasuo, Tsuge Kisetsu

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 71 ( 5 )   2019.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/pasj/psz078

    Web of Science

  17. Near- to mid-infrared spectroscopy of the heavily obscured AGN LEDA 1712304 with AKARI/IRC Reviewed

    Tsuchikawa T., Kaneda H., Oyabu S., Kokusho T., Morihana K., Kobayashi H., Yamagishi M., Toba Y.

    ASTRONOMY & ASTROPHYSICS   Vol. 626   2019.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1051/0004-6361/201935483

    Web of Science

  18. Dust properties in the cold and hot gas phases of the ATLAS3D early-type galaxies as revealed by AKARI Reviewed

    Kokusho T., Kaneda H., Bureau M., Suzuki T., Murata K., Kondo A., Yamagishi M., Tsuchikawa T., Furuta T.

    ASTRONOMY & ASTROPHYSICS   Vol. 622   2019.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1051/0004-6361/201833911

    Web of Science

  19. A systematic study of Galactic infrared bubbles along the Galactic plane with AKARI and Herschel Reviewed

    Hanaoka Misaki, Kaneda Hidehiro, Suzuki Toyoaki, Kokusho Takuma, Oyabu Shinki, Ishihara Daisuke, Kohno Mikito, Furuta Takuya, Tsuchikawa Takuro, Saito Futoshi

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 71 ( 1 )   2019.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/pasj/psy126

    Web of Science

  20. Enhanced dust emissivity power-law index along the western H alpha filament of NGC 1569 Reviewed

    Suzuki T., Kaneda H., Onaka T., Yamagishi M., Ishihara D., Kokusho T., Tsuchikawa T.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 477 ( 3 ) page: 3065-3075   2018.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/mnras/sty800

    Web of Science

  21. SPICA mid-infrared instrument (SMI): conceptual design and feasibility studies

    Kaneda, Hidehiro; Ishihara, Daisuke; Oyabu, Shinki; Fukagawa, Misato; Kokusho, Takuma; Suzuki, Toyoaki; Furuta, Takuya; Tsuchikawa, Takurou; Wada, Takehiko; Isobe, Naoki; Kawada, Mitsunobu; Kwon, Jungmi; Matsuhara, Hideo; Nagase, Koichi; Nakagawa, Takao; Ootsubo, Takafumi; Yamagishi, Mitsuyoshi; Sakon, Itsuki; Tsumura, Kohji; Shibai, Hiroshi

    Proceedings of the SPIE   Vol. 10698   2018.7

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    Language:English  

    DOI: 10.1117/12.2313093

  22. Processing of hydrocarbon dust in star-forming galaxies revealed with AKAR

    Kondo, Akino; Kaneda, Hidehiro; Fukagawa, Misato; Suzuki, Toyoaki; Murata, Katsuhiro L.; Kokusho, Takuma; Oyabu, Shinki

    Proceedings of The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life     2018.3

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  23. A systematic study of Galactic infrared bubbles along the whole Galactic plane with the AKARI all-sky surveys

    Hanaoka, Misaki; Kaneda, Hidehiro; Suzuki, Toyoaki; Kokusho, Takuma; Oyabu, Shinki; Ishihara, Daisuke

    Proceedings of The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life     2018.3

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  24. Development of the near-infrared spectrometer for the IRSF telescope

    Furuta, Takuya; Nagayama, Takahiro; Kaneda, Hidehiro; Kokusho, Takuma; Yamaguchi, Yuta; Tsuchikawa, Takuro; Fukagawa, Misato; Ishihara, Daisuke

    Proceedings of The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life     2018.3

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  25. A multiwavelength study of the ISM and star formation in early-type galaxies

    Kokusho, Takuma; Kaneda, Hidehiro; Bureau, Martin; Suzuki, Toyoaki; Murata, Katsuhiro; Kondo, Akino; Yamagishi, Mitsuyoshi

    Proceedings of The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life     2018.3

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  26. SPICA Mid-infrared Instrument (SMI): conceptual design and feasibility studies

    Kaneda Hidehiro, Ishihara Daisuke, Oyabu Shinki, Fukagawa Misato, Kokusho Takuma, Suzuki Toyoaki, Furuta Takuya, Tsuchikawa Takurou, Wada Takehiko, Isobe Naoki, Kawada Mitsunobu, Kwon Jungmi, Matsuhara Hideo, Nagase Koichi, Nakagawa Takao, Ootsubo Takafumi, Yamagishi Mitsuyoshi, Sakon Itsuki, Tsumura Kohji, Shibai Hiroshi

    SPACE TELESCOPES AND INSTRUMENTATION 2018: OPTICAL, INFRARED, AND MILLIMETER WAVE   Vol. 10698   2018

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1117/12.2313093

    Web of Science

  27. A relationship of polycyclic aromatic hydrocarbon features with galaxy merger in star-forming galaxies at z < 0.2 Reviewed

    Murata Katsuhiro L., Yamada Rika, Oyabu Shinki, Kaneda Hidehiro, Ishihara Daisuke, Yamagishi Mitsuyoshi, Kokusho Takuma, Takeuchi Tsutomu T.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 472 ( 1 ) page: 39-50   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/mnras/stx1902

    Web of Science

  28. A star formation study of the ATLAS3D early-type galaxies with the AKARI all-sky survey Reviewed

    Kokusho T., Kaneda H., Bureau M., Suzuki T., Murata K., Kondo A., Yamagishi M.

    ASTRONOMY & ASTROPHYSICS   Vol. 605   2017.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1051/0004-6361/201630158

    Web of Science

  29. A systematic study of dust in early-type galaxies with AKARI Reviewed

    Kokusho, T., Kaneda, H., Kondo, T., Oyabu, S., Yamagishi, M., Murata, K.

      Vol. 32 ( 1 ) page: 151-153   2017.3

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.5303/PKAS.2017.32.1.151

  30. Properties of Dust in Various Environments of Nearby Galaxies Reviewed

    Kaneda, Hidehiro; Kokusho, Takuma; Yamada, Rika; Ishihara, Daisuke; Oyabu, Shinki; Kondo, Toru; Yamagishi, Mitsuyoshi; Yasuda, Akiko; Onaka, Takashi; Suzuki, Toyoaki

    Publications of The Korean Astronomical Society   Vol. 32 ( 1 )   2017.3

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    Language:English  

    DOI: 10.5303/PKAS.2017.32.1.135

  31. Development of New Stitching Interferometry for the SPICA Telescope Reviewed

    Yamanaka, Asa; Kaneda, Hidehiro; Yamagishi, Mitsuyoshi; Kondo, Toru; kokusho, Takuma; Tanaka, Kotomi; Hanaoka, Misaki; Nakagawa, Takao; Kawada, Mitsunobu; Isobe, Naoki; Arai, Toshiaki; Onaka, Takashi

    Publications of The Korean Astronomical Society   Vol. 32 ( 1 )   2017.3

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    DOI: 10.5303/PKAS.2017.32.1.363

  32. Mid- and far-infrared properties of Spitzer Galactic bubbles revealed by the AKARI all-sky surveys Reviewed

    Hattori, Yasuki; Kaneda, Hidehiro; Ishihara, Daisuke; Fukui, Yasuo; Torii, Kazufumi; Hanaoka, Misaki; Kokusho, Takuma; Kondo, Akino; Shichi, Kazuyuki; Ukai, Sota; Yamagishi, Mitsuyoshi; Yamaguchi, Yuta

    Publications of the Astronomical Society of Japan   Vol. 68 ( 3 )   2016.6

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    DOI: 10.1093/pasj/psw028

  33. A study of iron and dust in the supernova remnant IC 443 Reviewed

    Kokusho, T., Nagayama, T., Kaneda, H., Ishihara, D., Lee, Ho-Gyu., Onaka, T.

    Planetary and Space Science   Vol. 116   page: 92-96   2015.10

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.pss.2015.04.009

  34. Evaluation of InGaAs 640×512 detector array manufactured by Chunghwa Leading Photonics Tech

    Nagayama, Takahiro; Takeuchi, Nami; Kokusho, Takuma; Yamanaka, Asa; Nishiyama, Miho; Kaneda, Hidehiro

    Proceedings of the SPIE   Vol. 9154   2014.7

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    DOI: 10.1117/12.2055084

  35. Iron and dust in the supernova remnant IC443

    Kokusho, T.; Nagayama, T.; Kaneda, H.; Ishihara, D.; Lee, H. G.; Onaka, T.

    Proceedings of The Life Cycle of Dust in the Universe: Observations, Theory, and Laboratory Experiments (LCDU2013)     2013.11

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  36. Manufacturing and optical testing of 800 mm lightweight all C/SiC optics Invited Reviewed

    Kaneda, Hidehiro; Naitoh, Masataka; Nakagawa, Takao; Imai, Tadashi; Katayama, Haruyoshi; Suganuma, Masahiro; Tange, Yoshio; Sato, Ryota; Enya, Keigo; Kotani, Masaki; Maruyama, Kenta; Onaka, Takashi; Kokusho, Takuma

    Proceedings of the SPIE   Vol. 8837   2013.9

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  37. Large-area [Fe II] Line Mapping of the Supernova Remnant IC 443 with the IRSF/SIRIUS Reviewed

    Kokusho, T., Nagayama, T., Kaneda, H., Ishihara, D., Lee, Ho-Gyu., Onaka, T.

    The Astrophysical Journal Letters   Vol. 768 ( 1 ) page: 8-13   2013.5

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  38. Synergy between IRSF and AKARI Reviewed

    Nagayama, T.; Kokusho, T.; Kaneda, H.

    Publications of The Korean Astronomical Society   Vol. 27 ( 4 )   2012.11

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    DOI: 10.5303/PKAS.2012.27.4.381

  39. Experimental and numerical study of stitching interferometry for the optical testing of the SPICA Telescope

    Kaneda, Hidehiro; Naitoh, Masataka; Imai, Tadashi; Katayama, Haruyoshi; Onaka, Takashi; Nakagawa, Takao; Kawada, Mitsunobu; Yamagishi, Mitsuyoshi; Kokusho, Takuma

    Proceedings of the SPIE   Vol. 8442   2012.9

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1117/12.926879

  40. Design and status of an optical and near-infrared spectrometer for the IRSF 1.4m Telescope

    Nagayama, Takahiro; Kurita, Mikio; Kino, Masaru; Mori, Daisuke; Kokusho, Takuma

    Proceedings of the SPIE   Vol. 8446   2012.9

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    Language:English  

    DOI: 10.1117/12.926029

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Presentations 23

  1. 赤外線全天/広域サーベイで探る大質量星形成と星間・惑星間物質 Invited

    國生拓摩

    プラネタリウムで俯瞰する多波長全天/広域サーベイ  2023.7.19 

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    Event date: 2023.7

  2. Current status of the near-infrared spectrometer for the IRSF telescope International conference

    Takuma Kokusho

    The Workshop on Infrared Astronomy with the Infrared Survey Facility  2022.12.2 

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    Event date: 2022.12

    Language:English   Presentation type:Oral presentation (general)  

  3. YSOの系統的観測で探る大マゼラン雲の星形成活動

    國生拓摩, 鳥居洋希, 金田英宏, 福井康雄, 立原研悟

    日本天文学会2022年秋季年会  2022.9.14 

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    Event date: 2022.9

  4. 狭帯域フィルターを用いた超新星残骸のリン輝線マッピング観測 Invited

    國生拓摩

    かなたミニワークショップ  2022.7.21 

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    Event date: 2022.7

  5. IRSF分光器の開発

    國生拓摩

    2020年度IRSF勉強会  2021.3.9 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  6. IRSF望遠鏡に搭載する近赤外線分光器の開発

    國生拓摩

    2020年度せいめいユーザーズミーティング  2020.8.17 

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    Event date: 2020.8

    Language:Japanese   Presentation type:Oral presentation (general)  

  7. IRSF望遠鏡に搭載する近赤外線分光器の開発

    國生拓摩

    2019年度光赤外天文学大学間連携WS  2019.12.3 

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    Event date: 2019.12

    Language:Japanese   Presentation type:Oral presentation (general)  

  8. IRSF望遠鏡に搭載する近赤外線分光器の開発

    國生拓摩

    日本天文学会2019年秋季年会  2019.9.11 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

  9. 超新星残骸の近赤外[PII]輝線マッピング

    國生拓摩

    第1回リンと生命の起源研究会  2019.9.2 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  10. 近赤外[FeII]・H2輝線マッピングで探る超新星残骸IC443における宇宙線加速

    國生拓摩

    日本天文学会2019年春季年会  2019.3.15 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  11. IRSF分光器の開発

    國生拓摩

    2018年度IRSF勉強会  2019.3.7 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  12. CGH干渉計による自由曲面鏡の極低温での評価

    國生拓摩

    SMI技術進捗確認会  2018.9.6 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  13. 赤外光学材料KRS-5の低温での光学物性値測定

    國生拓摩

    SMI技術進捗確認会  2018.9.6 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  14. A systematic study of dust and star formation in early-type galaxies with AKARI International conference

    Takuma Kokusho, Hidehiro Kaneda, Martin Bureau, Toyoaki Suzuki, Mitsuyoshi Yamagishi, Takashi Onaka

    Cosmic Dust: origin, applications & implications  2018.6.11 

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    Event date: 2018.6

    Language:English   Presentation type:Poster presentation  

  15. SPICAのための赤外線アレイ検出器のピクセルベースでの波長感度評価法の確立

    土川拓朗, 金田英宏, 石原大助, 國生拓摩, 山口勇太, 石鉢卓也

    日本天文学会年会講演予稿集  2018.8.20 

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  16. SPICA搭載中間赤外線観測装置SMI:概念検討結果

    和田武彦, 金田英宏, 石原大助, 大薮進喜, 鈴木仁研, 深川美里, 國生拓摩, 川田光伸, 磯部直樹, 大坪貴文, 中川貴雄, 松原英雄, 權靜美, 長勢晃一, 山岸光義, 左近樹, 津村耕司, 芝井広

    日本天文学会年会講演予稿集  2018.8.20 

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  17. 「あかり」による銀河系円盤全域における赤外線バブルの統計的研究

    花岡美咲, 金田英宏, 鈴木仁研, 國生拓摩, 大薮進喜, 石原大助

    日本天文学会年会講演予稿集  2018.2.20 

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  18. 「あかり」赤外線全天データで探る早期型銀河ダストの無バイアスな描像

    金田英宏, 國生拓摩, 鈴木仁研, 村田勝寛, 近藤晶乃, 山岸光義

    日本天文学会年会講演予稿集  2017.2.28 

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  19. 「あかり」赤外線全天マップで探る早期型銀河のダストと分子ガス・X線プラズマの関係

    國生拓摩, 金田英宏, 鈴木仁研, 近藤晶乃, 村田勝寛, 山岸光義

    日本天文学会年会講演予稿集  2018.2.20 

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  20. 「あかり」赤外線全天観測による早期型銀河の星形成の系統的研究

    國生拓摩, 金田英宏, 鈴木仁研, 村田勝寛, 近藤晶乃, 山岸光義

    日本天文学会年会講演予稿集  2017.2.28 

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  21. 「あかり」赤外線分光観測で探る星形成銀河における炭化水素ダストの変成

    近藤晶乃, 金田英宏, 鈴木仁研, 村田勝寛, 國生拓摩, 石原大助, 大薮進喜, 山岸光義

    日本天文学会年会講演予稿集  2017.2.28 

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  22. 新しいIRSF点源カタログを用いた LMC減光マップの作成

    國生拓摩

    2017年度IRSF勉強会  2017.3.5 

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  23. 超新星残骸の近赤外 [PII] 輝線マッピング観測

    國生拓摩

    第 1 回リンと生命の起源研究会  2019.9.2 

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Research Project for Joint Research, Competitive Funding, etc. 5

  1. 地球型惑星の形成プロセスの理解に向けた南アフリカ望遠鏡IRSF-SAND光ファイバーリンクの開発

    2023.4 - 2024.3

    アストロバイオロジーセンタープロジェクト研究 

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\1465000

  2. 極低温下における⾃由曲⾯鏡の形状評価のための⾼精度・⾼汎⽤⼲渉計の開発

    2022.7 - 2023.2

    搭載機器基礎開発研究費 

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2860000 ( Direct Cost: \2600000 、 Indirect Cost:\260000 )

  3. 極低温下における⾃由曲⾯鏡の形状評価のための⾼精度・⾼汎⽤⼲渉計の開発

    2021.7 - 2022.2

    搭載機器基礎開発研究費 

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\1100000 ( Direct Cost: \1000000 、 Indirect Cost:\100000 )

  4. 生命誕生の理解へ向けた超新星爆発によるリン生成メカニズムの観測的研究

    2021.4 - 2022.3

    稲盛研究助成 

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\1000000 ( Direct Cost: \1000000 )

  5. 自由曲面鏡の低温での形状評価方法の開発

    2019.6 - 2020.2

    搭載機器基礎開発研究費 

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    Grant type:Competitive

    Grant amount:\2900000 ( Direct Cost: \2636000 、 Indirect Cost:\264000 )

KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. 生命誕生の理解に向けた超新星爆発によるリン生成の精密定量

    Grant number:22H01264  2022.4 - 2026.3

    科学研究費助成事業  基盤研究(B)

    國生 拓摩, 永山 貴宏

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    Authorship:Principal investigator 

    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

    リンはDNAや細胞壁などの材料で、生命を司る元素のひとつである。その起源は超新星爆発にまでさかのぼるが、リンの生成メカニズムや、惑星・生命へ至るプロセスは理解されていない。本研究は近赤外リン輝線に着目し、狭帯域フィルターを用いた超新星残骸のリン輝線マッピング観測を行う。検出されるリンには星間物質を起源とする成分が含まれる可能性があるため、専用分光器を用いて爆発のため高速で運動する超新星起源のリンを同定する。本手法により多くの天体を観測して超新星起源のリンを徹底して見つけ出し、超新星爆発によるリン生成について網羅的な知見を得ることで、リン観測を軸とした宇宙生物学の新しい分野を開拓する。

  2. 大マゼラン雲の近赤外輝線サーベイで探るスーパーシェルによる誘発的星形成

    Grant number:19K14757  2019.4 - 2022.3

    若手研究

    國生 拓摩

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    大マゼラン雲には直径1 kpcにも及ぶスーパーシェルが点在し、星間物質を圧縮して星形成を誘発すると考えられているが、大きな構造のため詳細な観測が難しく、そのメカニズムは謎に包まれている。本研究では、大マゼラン雲に対し衝撃波トレーサーの近赤外[FeII]・H2輝線サーベイ観測を行い、星間物質と相互作用するシェルを徹底して見つけ出す。また近・中間赤外線データをもとに前主系列星の位置と進化段階を調べ、星形成を伴うシェルを同定する。さらに、これらの星形成シェルの分光フォローアップ観測により星間物質の物理状態を調べ、スーパーシェルによる誘発的星形成のメカニズムを明らかにする。
    超新星残骸の複合体であるスーパーシェルは、星間物質との相互作用により星形成を誘発すると考えられている。しかしスーパーシェルは大規模な構造のため、周りの星形成との関係を調べることが難しく、その物理メカニズムは良く理解されていない。本研究では衝撃波トレーサである近赤外[FeII]・H2輝線に着目し、大マゼラン雲スーパーシェルの広域マッピング観測により、星形成誘発のメカニズムを探る。
    当該年度は、南アフリカ望遠鏡IRSFを用いて、大マゼラン雲スーパーシェルの近くに位置する星形成領域を観測した。具体的には、[FeII]・H2輝線を透過する狭帯域フィルターをIRSFのカメラに搭載し、同輝線のマッピング観測を30 Dor領域に対して行った。その結果、衝撃波を伴う領域で星形成が起きている兆候が捉えられた。さらにスーパーシェルと星形成の時間発展の関係を明らかにするため、IRSFやSpitzer、Herschelの赤外線点源カタログを用いて、赤外線SEDのモデルフィッティングにより、前主系列星の進化段階を調べた。この解析を大マゼラン雲の前主系列星サンプルのおよそ半数について終え、現在は残りの天体の解析を進めている。
    上記の観測研究に加え、衝撃波領域の詳細なフォローアップ観測を行うため、IRSF近赤外分光器の開発を進めた。本装置はロングスリットを採用し、スリットビュワーにより観測天体を素早くスリットに導入することで、マッピング効率を高めた設計となっている。当該年度は、実験室にて完成させた本装置を鹿児島大学の1m望遠鏡に取り付けて試験観測を行い、期待通りの性能を有していることを確認した。
    本研究では、大マゼラン雲スーパーシェルと星間物質が相互作用している領域を特定すべく、スーパーシェルの[FeII]・H2輝線マッピング観測を行う。さらに、IRSF近赤外分光器を新しく開発し、相互作用領域の詳しい解析のためフォローアップ観測を行う。当該年度は本装置が期待通りの性能を有していることを確認できたが、試験観測の初期において様々な動作トラブルが発生し、この修正に多くの時間を要した。そのため、スーパーシェルの[FeII]・H2マッピング観測を十分に進めることができず、予定していた観測領域を全てカバーできなかった。以上のことから、達成度はやや遅れていると判断した。
    今後は、予定より遅れている大マゼラン雲スーパーシェルの[FeII]・H2輝線マッピング観測を優先して進め、星間物質と相互作用している領域の同定を行う。これと並行して、種々の赤外線点源カタログを用いて、未解析の前主系列星について進化段階を明らかにする。これらの結果を合わせて、スーパーシェルの伝播に伴う前主系列星の進化や、衝撃波と星間物質の相互作用の程度から、スーパーシェルによる星形成誘発の可能性を探る。
    鹿児島大学1m望遠鏡での試験観測にて、本研究で開発したIRSF分光器が期待通りの性能を有することが確認できた。今後は一度、名古屋大学の実験室に装置を輸送し、検出器をより高感度な別の検出器へとアップグレードし、IRSF望遠鏡へ取り付ける。現地での試験観測の後、衝撃波を伴うスーパーシェルの分光フォローアップ観測を進める。

  3. A study of the supernova nucleosynthesis of phosphorus with near-infrared spectral mapping of supernova remnants

    Grant number:17H06739  2017.8 - 2019.3

    Kokusho Takuma

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    Grant amount:\2600000 ( Direct Cost: \2000000 、 Indirect Cost:\600000 )

    In order to understand the nucleosynthesis mechanism of phosphorus by supernova, we developed a near-infrared spectrometer to perform mapping observations of supernova remnants in the [PII] emission. The spectrometer is equipped with a near-infrared slit viewer, which enables us to perform very precise spectral mapping. We attached the spectrometer to the 1-m telescope operated by Kagoshima University and successfully observed near-infrared spectra of the standard stars, from which we have evaluated the optical performance of the spectrometer. We have also carried out spectral mapping observations of some supernova remnants, such as W49B.

 

Teaching Experience (On-campus) 5

  1. Laboratory in Physics

    2023

  2. Laboratory in Physics

    2023

  3. Physics Seminars IX-II

    2022

  4. 物理学実験

    2022

  5. 物理学実験

    2021