Star formation in galaxies in the violent epoch of galaxy evolution

• Project/Area Number: 16K05294
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Kyoto University
• Principal Investigator: Ohta Kouji 京都大学, 理学研究科, 教授 (50221825)
• Research Collaborator: Seko Akifumi ; Maeda Fumiya
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 銀河 / 銀河進化 / 星形成 / 電波天文学 / 光赤外線天文学

Outline of Final Research Achievements

How do galaxies convert gas into stars and form structure of galaxies? What is the condition for the star formation in galaxies? We studied these questions with respect to the molecular gas in galaxies. We revealed nature of the molecular gas clumps in a 'molecular clumpy galaxy', which may be in an evolutionary stage of a disk galaxy in the epoch of violent evolution of galaxies. We also found new insights for the cause for the very inefficient star formation in the present-day galaxies. The insights would be useful to understand the over production of stars in high redshift universe theoretically faced problem.

Academic Significance and Societal Importance of the Research Achievements

銀河とは、宇宙の中でガスを星に転換していくシステムであると捉えることができる。従って、銀河内でどのように星が形成されていくのかを明らかにすることが重要である。本研究では、今から約90億年前に円盤銀河がどのように形成されたかの一端を見ることができた点、星生成の母胎である分子ガスがあっても星ができない原因の可能性を見出したという点で、意義があると考えられる。宇宙の成り立ちを知ることは最終的には人類の世界観に寄与すると考えられ、社会的にも意義はあるものと考えられる。

Research Products

• [Journal Article] Large velocity dispersion of molecular gas in bars of strongly barred galaxies NGC1300 and NGC5383 (2018)
  • Author(s): Maeda Fumiya、Ohta Kouji、Fujimoto Yusuke、Habe Asao、Baba Junichi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 3 Pages: 37-45
  • DOI: 10.1093/pasj/psy028
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A (2018)
  • Author(s): The IceCube Collaboration、Fermi-LAT、MAGIC、AGILE、ASAS-SN、HAWC、H.E.S.S.、INTEGRAL、Kanata、Kiso、Kapteyn、Liverpool Telescope、Subaru、Swift/NuSTAR、VERITAS、VLA/17B-403 teams
  • Journal Title: Science Volume: 361 Issue: 6398 Pages: 1378-1378
  • DOI: 10.1126/science.aat1378
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Why Are Some Gamma-Ray Bursts Hosted by Oxygen-rich Galaxies? (2018)
  • Author(s): Hashimoto Tetsuya、Chaudhary Ravi、Ohta Kouji、Goto Tomotsugu、Hammer Francois、Kong Albert K. H.、Nomoto Ken’ichi、Mao Jirong
  • Journal Title: The Astrophysical Journal Volume: 863 Issue: 1 Pages: 95-95
  • DOI: 10.3847/1538-4357/aad2d1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA twenty-six arcmin2 survey of GOODS-S at one millimeter (ASAGAO): Source catalog and number counts (2018)
  • Author(s): Hatsukade Bunyo、Kohno Kotaro、Yamaguchi Yuki、Umehata Hideki et al
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 6 Pages: 105-122
  • DOI: 10.1093/pasj/psy104
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA 26 arcmin2 Survey of GOODS-S at One-millimeter (ASAGAO): X-Ray AGN Properties of Millimeter-selected Galaxies (2018)
  • Author(s): 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.、et al.
  • Journal Title: The Astrophysical Journal Volume: 853 Issue: 1 Pages: 24-24
  • DOI: 10.3847/1538-4357/aa9f10
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Extremely Red Submillimeter Galaxies: New z>4-6 Candidates Discovered using ALMA and Jansky VLA (2017)
  • Author(s): Ikarashi S., Ivison R. J., Caputi K. I., Nakanishi K., Lagos C. D. P., Ashby M. L. N., Aretxaga I., Dunlop J. S., Hatsukade B., Hughes D. H., Iono D., Izumi T., Kawabe R., Kohno K., Motohara K., et al.
  • Journal Title: The Astrophysical Journal Volume: 835 Issue: 2 Pages: 286-286
  • DOI: 10.3847/1538-4357/835/2/286
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Very Compact Millimeter Sizes for Composite Star-forming/AGN Submillimeter Galaxies (2017)
  • Author(s): Ikarashi S., Caputi K. I, Ohta K., 他20名
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 2 Pages: 36-44
  • DOI: 10.3847/2041-8213/aa9572
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evolution of cosmic molecular gas mass density from z~0 to z=1-1.5 (2017)
  • Author(s): aeda, F., Ohta, K., and Seko, A.
  • Journal Title: the Astrophysical Journal Volume: 835 Issue: 2 Pages: 120-120
  • DOI: 10.3847/1538-4357/835/2/120
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Constraint on the Inflow/outflow Rates in Star-forming Galaxies at z ~ 1.4 from Molecular Gas Observations (2016)
  • Author(s): A.Seko, K.Ohta, K.Yabe, B.Hatsukade, M.Akiyama, N.Tamura, F.Iwamuro, G.Dalton
  • Journal Title: Astrophys.J. Volume: 833 Issue: 1 Pages: 53-53
  • DOI: 10.3847/1538-4357/833/1/53
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Gas-to-dust ratios in massive star-forming galaxies at z~1.4 (2016)
  • Author(s): Seko, A., Ohta, K., Yabe, K., Hatsukade, B., Aono, Y., and Iono, D.
  • Journal Title: Publication of Astronomical Society of Japan Volume: 68(4) Issue: 4 Pages: 62-62
  • DOI: 10.1093/pasj/psw060
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] SXDF-ALMA 2-arcmin^2 deep survey: 1.1-mm number counts (2016)
  • Author(s): Hatsukade B., Kohno K., Umehata H., Aretxaga I., Caputi K. I., Dunlop J. S., Ikarashi S., Iono D., Ivison R. J., Lee M., Makiya R., Matsuda Y., Motohara K., Nakanishi K., Ohta K., Tadaki K.-i., Tamura Y., Wang W.-H., Wilson G. W., Yamaguchi Y., Yun M. S.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 3 Pages: 36-36
  • DOI: 10.1093/pasj/psw026
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The Subaru FMOS Galaxy Redshift Survey (FastSound). II. The Emission Line Catalog and Properties of Emission Line Galaxies (2016)
  • Author(s): H,Okada, T.Totani, M.Tonegawa, M.Akiyama, G.Dalton, K.Glazebrook, F.Iwamuro, 他10名
  • Journal Title: Publ.Astron.Soc.Japan Volume: 68 Issue: 3 Pages: 47-47
  • DOI: 10.1093/pasj/psw043
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The Subaru FMOS galaxy redshift survey (FastSound). IV. New constraint on gravity theory from redshift space distortions at z~1.4 (2016)
  • Author(s): T. Okumura, et al. (including R. Takahashi, the 21th in 25 co-authors)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 3 Pages: 38-38
  • DOI: 10.1093/pasj/psw029
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 強い棒渦巻銀河 NGC1300 における分子雲の性質 (2019)
  • Author(s): 前田郁弥, 太田耕司 , 羽部朝男, 藤本裕輔, 馬場淳一
  • Organizer: 日本天文学会
• [Presentation] 強い棒渦巻銀河 NGC1300 における星形成の抑制 (2019)
  • Author(s): 羽部朝男, 藤本裕輔, 前田郁弥, 太田耕司
  • Organizer: 日本天文学会
• [Presentation] 棒渦巻銀河の棒部における星形成の抑制 3 (2018)
  • Author(s): 前田郁弥, 太田耕司, 羽部朝男 , 藤本裕輔 , 馬場淳一
  • Organizer: 日本天文学会
• [Presentation] Evolution of Cosmic Molecular Gas Mass Density from z~0 to z = 1-1.5 (2018)
  • Author(s): Fumiya Maeda、K. Ohta, A. Seko
  • Organizer: The role of gas in galaxy dynamics
  • Int'l Joint Research
• [Presentation] すばるPSFによる銀河分光サーベイへの期待 (2018)
  • Author(s): 太田耕司
  • Organizer: 日本天文学会
  • Invited
• [Presentation] 極端に輝線等価幅の大きい近傍矮小銀河の可視光面分光観測 (2017)
  • Author(s): 松林和也、太田耕司、長尾透、嘉数悠子
  • Organizer: 日本天文学会
  • Place of Presentation: 九州大学(福岡県・福岡市）
  • Year and Date: 2017-03-15
• [Presentation] 分子ガス観測から制限するz~1.4における星形成銀河のガスの流入率・流出率 (2017)
  • Author(s): 世古明史、太田耕司、他6名
  • Organizer: 日本天文学会
  • Place of Presentation: 九州大学(福岡県・福岡市）
  • Year and Date: 2017-03-15
• [Presentation] 棒渦巻銀河の棒部における星形成の抑制２ (2017)
  • Author(s): 前田郁弥、太田耕司、羽部朝男、藤本裕輔、馬場淳一
  • Organizer: 日本天文学会
• [Presentation] 150MHz TGSS, 1.4GHz NVSSデータを用いたブレーザー候補天体カタログとPan STARRSデータによる可視対応天体の同定 (2017)
  • Author(s): 田中康之、内海洋輔、井上芳幸、太田耕司
  • Organizer: 日本天文学会
• [Presentation] z=0.1-0.2の一般的な星形成銀河における分子ガスの性質 (2017)
  • Author(s): 世古明史、太田耕司、他8名
  • Organizer: 日本天文学会
  • Place of Presentation: 九州大学(福岡県・福岡市）
• [Presentation] 宇宙の分子ガス密度の進化２ (2017)
  • Author(s): 前田郁弥、太田耕司、世古明史
  • Organizer: 日本天文学会
  • Place of Presentation: 九州大学(福岡県・福岡市）
• [Presentation] ガンマ線バースト母銀河における分子ガス探査 (2017)
  • Author(s): 廿日出文洋、太田耕司、他5名
  • Organizer: 日本天文学会
  • Place of Presentation: 九州大学(福岡県・福岡市）
• [Presentation] 大規模近赤外分光サンプルで明らかにする銀河環境とガス金属量との関係 (2017)
  • Author(s): 矢部清人、太田耕司、他
  • Organizer: 日本天文学会
  • Place of Presentation: 九州大学(福岡県・福岡市）
• [Presentation] Constraint on the inflow/outflow rates in star-forming galaxies at z~1.4 from molecular gas observations (2016)
  • Author(s): Seko, A., Ohta, K., Yabe, K., Hatsukade, B., Akiyama, M., Tamura, N., Iwamuro, F., and Dalton, G.
  • Organizer: The galaxy life-cycle : From activity to quiescence, and back, across cosmic times
  • Place of Presentation: ベニス(イタリア）
  • Year and Date: 2016-10-24
  • Int'l Joint Research
• [Presentation] 棒渦巻銀河の棒部における星形成の抑制 (2016)
  • Author(s): 太田耕司、世古明史、青野佑弥、羽部朝男、藤本裕輔、馬場淳一
  • Organizer: 日本天文学会
  • Place of Presentation: 愛媛大学（愛媛県・松山市）
• [Presentation] 分子ガス密度の宇宙論的進化 (2016)
  • Author(s): 前田郁弥、太田耕司、世古明史
  • Organizer: 日本天文学会
  • Place of Presentation: 愛媛大学（愛媛県・松山市）
• [Book] 銀河Ⅰ 第２版 (2018)
  • Author(s): 谷口義明、岡村定矩、祖父江義明他
  • Total Pages: 384
  • Publisher: 日本評論社
  • ISBN: 9784535607545