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observational study of star-formation suppression in barred galaxies

Research Project

Project/Area Number 19K03928
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 16010:Astronomy-related
Research InstitutionKyoto University

Principal Investigator

Ohta Kouji  京都大学, 理学研究科, 教授 (50221825)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords銀河 / 星形成 / 銀河進化
Outline of Research at the Start

強い棒構造を持つ棒渦巻銀河の棒部では、星形成の材料となる分子ガスが存在するにも拘わらず、星形成がほとんど起こっていない。この原因を探ることが本研究の目的である。この問題は単に棒部における星非形成の問題にとどまらない。近年、理論的には、銀河では星がたくさん出来すぎることが問題視されており、星形成を抑制するモデルがいくつも提案され、この大きな問題に一石を投じるものである。本研究では、最近の観測装置・理論モデルの発展を踏まえて、新たな観点から原因を探ることを目指している。棒部における星形成が特に強く抑制されている銀河を対象にすることで、症例の原因をクリアに分離したいと考えている。

Outline of Final Research Achievements

Galaxies evolve by converting gas to stars. Thus, revealing condition for star formation is very important for the understanding of galaxy evolution. In barred galaxies, active star formation is seen in an arm region as well as a bar end. However, in a bar region star formation is not seen, i.e., star formation is suppressed in the bar region. In order to reveal cause(s) for the star formation suppression, we aimed to clarify conditions to suppress (or promote) star formation, using barred galaxies as a good laboratory. We found a fraction of diffuse molecular gas which does not contribute to star formation is large in the bar region, leading low star formation efficiency. We also found molecular cloud in bar region is less massive and a high velocity encounter between molecular clouds occurs, also leading to low star formation efficiency.

Academic Significance and Societal Importance of the Research Achievements

宇宙の構造やその中での天体の形成や進化を明らかにすることは、人類の世界観を構築し、その精神的バックボーンを形成するという意味で、極めて重要である。宇宙の主要構成要素である銀河の形成・進化を解明することはこのような観点から重要であると言える。本研究は、近傍宇宙に存在する銀河を実験室として、銀河における星形成がどのような条件で起こるのか・起こらないのかを明らかにすることで、銀河や星の形成・進化の解明に大きな一歩を加えており、その意義は高いものと考える。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (32 results)

All 2023 2022 2021 2020 2019

All Journal Article (16 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 16 results,  Open Access: 14 results) Presentation (16 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Statistical Study of the Star Formation Efficiency in Bars: Is Star Formation Suppressed in Gas-rich Bars?2023

    • Author(s)
      Maeda Fumiya、Egusa Fumi、Ohta Kouji、Fujimoto Yusuke、Habe Asao
    • Journal Title

      The Astrophysical Journal

      Volume: 943 Issue: 1 Pages: 7-7

    • DOI

      10.3847/1538-4357/aca664

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Search for Hα Emitters at z~7.8: A Constraint on the Hα-based Star Formation Rate Density2022

    • Author(s)
      Asada Yoshihisa, Ohta Kouji
    • Journal Title

      Astrophysical Journal

      Volume: 924 Issue: 2 Pages: 71-71

    • DOI

      10.3847/1538-4357/ac356a

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] CO(2-1)/CO(1-0) Line Ratio on a 100 Parsec Scale in the Nearby Barred Galaxy NGC 13002021

    • Author(s)
      Maeda, Fumiya; Egusa, Fumi; Ohta, Kouji; Fujimoto, Yusuke; Habe, Asao ; Asada, Yoshihisa
    • Journal Title

      The Astrophysical Journal

      Volume: 926 Issue: 1 Pages: 96-110

    • DOI

      10.3847/1538-4357/ac4505

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Star Formation Rate Function at z~4.5: An Analysis from Rest UV to Optical2021

    • Author(s)
      Asada Yoshihisa, Ohta Kouji, Maeda Fumiya
    • Journal Title

      Astrophysical Journal

      Volume: 915 Issue: 1 Pages: 47-47

    • DOI

      10.3847/1538-4357/ac005a

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Connection among environment, cloud-cloud collision speed, and star formation activity in the strongly barred galaxy NGC 13002021

    • Author(s)
      Maeda Fumiya、Ohta Kouji、Fujimoto Yusuke、Habe Asao
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 502 Issue: 2 Pages: 2238-2250

    • DOI

      10.1093/mnras/stab130

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Internal Structure of Molecular Gas in a Main-sequence Galaxy With a UV Clump at z = 1.452021

    • Author(s)
      Ushio Kaito、Ohta Kouji、Maeda Fumiya、Hatsukade Bunyo、Yabe Kiyoto
    • Journal Title

      The Astrophysical Journal

      Volume: 909 Issue: 1 Pages: 84-84

    • DOI

      10.3847/1538-4357/abdd1f

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Follow-up observations for IceCube-170922A: Detection of rapid near-infrared variability and intensive monitoring of TXS 0506+0562021

    • Author(s)
      Morokuma Tomoki、Utsumi Yousuke、Ohta Kouji、他36名
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 73 Issue: 1 Pages: 25-43

    • DOI

      10.1093/pasj/psaa110

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A large amount of diffuse molecular gases in the bar of the strongly barred galaxy NGC?1300: cause of the low star formation efficiency2020

    • Author(s)
      Maeda Fumiya、Ohta Kouji、Fujimoto Yusuke、Habe Asao、Ushio Kaito
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 495 Issue: 4 Pages: 3840-3858

    • DOI

      10.1093/mnras/staa1296

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Seimei telescope project and technical developments2020

    • Author(s)
      Kurita Mikio、Kino Masaru、Iwamuro Fumihide、Ohta Kouji、他16名
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 72 Issue: 3 Pages: 48-48

    • DOI

      10.1093/pasj/psaa036

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Blazar Radio and Optical Survey (BROS): A Catalog of Blazar Candidates Showing Flat Radio Spectrum and Their Optical Identification in Pan-STARRS1 Surveys2020

    • Author(s)
      Itoh Ryosuke、Utsumi Yousuke、Inoue Yoshiyuki、Ohta Kouji、Doi Akihiro、Morokuma Tomoki、Kawabata Koji S.、Tanaka Yasuyuki T.
    • Journal Title

      The Astrophysical Journal

      Volume: 901 Issue: 1 Pages: 3-3

    • DOI

      10.3847/1538-4357/abab07

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Properties of giant molecular clouds in the strongly barred galaxy NGC 13002020

    • Author(s)
      Maeda Fumiya、Ohta Kouji、Fujimoto Yusuke、Habe Asao
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 493 Issue: 4 Pages: 5045-5061

    • DOI

      10.1093/mnras/staa556

    • NAID

      120006871767

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Fast cloud-cloud collisions in a strongly barred galaxy: Suppression of massive star formation2020

    • Author(s)
      Fujimoto Yusuke、Maeda Fumiya、Habe Asao、Ohta Kouji
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: - Issue: 2 Pages: 2131-2146

    • DOI

      10.1093/mnras/staa840

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ALMA CO Observations of the Host Galaxies of Long-duration Gamma-Ray Bursts. I. Molecular Gas Scaling Relations2020

    • Author(s)
      Hatsukade Bunyo、Ohta Kouji、Hashimoto Tetsuya、Kohno Kotaro、Nakanishi Kouichiro、Niino Yuu、Tamura Yoichi
    • Journal Title

      The Astrophysical Journal

      Volume: 892 Issue: 1 Pages: 42-42

    • DOI

      10.3847/1538-4357/ab7992

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Molecular Gas Properties in the Host Galaxy of GRB 0802072019

    • Author(s)
      Hatsukade Bunyo、Hashimoto Tetsuya、Kohno Kotaro、Nakanishi Kouichiro、Ohta Kouji、Niino Yuu、Tamura Yoichi、Toth L. Viktor
    • Journal Title

      The Astrophysical Journal

      Volume: 876 Issue: 2 Pages: 91-91

    • DOI

      10.3847/1538-4357/ab1649

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Star-formation rates of two GRB host galaxies at z~2 and a [CII] deficit observed with ALMA2019

    • Author(s)
      Hashimoto Tetsuya、Hatsukade Bunyo、Goto Tomotsugu、Kim Seong Jin、Ohta Kouji、Nagao Tohru、Kong Albert K H、Nakanishi Kouichiro、Mao Jirong
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 488 Issue: 4 Pages: 5029-5041

    • DOI

      10.1093/mnras/stz2034

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] KOOLS-IFU: Kyoto Okayama Optical Low-dispersion Spectrograph with optical-fiber Integral Field Unit2019

    • Author(s)
      Matsubayashi Kazuya、Ohta Kouji、Iwamuro Fumihide、Iwata Ikuru、Kambe Eiji、Tsutsui Hironori、Izumiura Hideyuki、Yoshida Michitoshi、Hattori Takashi
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 71 Issue: 5 Pages: 102-119

    • DOI

      10.1093/pasj/psz087

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 棒渦巻銀河の棒部における星形成効率の統計的調査 22023

    • Author(s)
      前田郁弥, 江草芙実, 太田耕司, 藤本裕輔, 羽部朝男
    • Organizer
      日本天文学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Star Formation Rate Functions at z >~ 4 indicated from GSMFs and MS relations2023

    • Author(s)
      浅田喜久, 太田耕司
    • Organizer
      日本天文学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 合体直前の超大質量ブラックホールバイナリ候補 SDSS J1430+2303 における広輝線スペクトル変化のモニター観測2023

    • Author(s)
      星篤志, 山田亨, 太田耕司
    • Organizer
      日本天文学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 棒渦巻銀河の棒部における星形成効率の統計的調査2022

    • Author(s)
      前田郁弥, 江草芙実, 太田耕司, 藤本裕輔, 羽部朝男
    • Organizer
      日本天文学会春季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Test for a Quenching Mechanism of Cosmic Web Detachment2022

    • Author(s)
      Shin Inoue, Kouji Ohta, Yoshihisa Asada, Marcin Sawicki
    • Organizer
      日本天文学会春季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 棒渦巻銀河 NGC1300 における巨大分子雲の CO(2 - 1)/CO(1 - 0) 比2021

    • Author(s)
      前田郁弥, 江草芙実 , 太田耕司, 浅田喜久, 藤本裕輔, 羽部 朝男
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] z~7.8 における Hα 輝線天体の探査と星形成率密度への制限2021

    • Author(s)
      浅田喜久, 太田耕司
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 銀河内部における分子雲衝突速度の環境依存性と星形成活動との関係2021

    • Author(s)
      前田郁弥, 太田耕司 , 藤本裕輔 , 羽部朝男
    • Organizer
      日本天文学会春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Star Formation Rate Function at z~4.5 from Rest FUV to Optical2021

    • Author(s)
      浅田喜久, 太田耕司
    • Organizer
      日本天文学会春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Poor Property of Rest UV Luminosity as a SFR Indicator in High-z Universe2021

    • Author(s)
      浅田喜久, 太田耕司
    • Organizer
      日本天文学会春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Molecular gas distribution in a main sequence galaxy with a UV clump at z = 1.452020

    • Author(s)
      牛尾海登, 太田耕司, 前田郁弥, 矢部清人, 廿日出文洋
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 極めて等価幅の大きな輝線銀河の検出と初代銀河の可能性について2020

    • Author(s)
      浅田喜久, 太田耕司, 牛尾海登, 前田郁弥
    • Organizer
      日本天文学会春季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Properties of molecular gases in a strongly barred galaxy NGC 13002019

    • Author(s)
      前田郁弥、太田耕司、藤本裕輔、羽部朝男
    • Organizer
      Linking the Milky Way and Nearby Galaxies 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Properties of giant molecular clouds in a strongly barred galaxy NGC 13002019

    • Author(s)
      前田郁弥、太田耕司、藤本裕輔、羽部朝男
    • Organizer
      ALMA2019: Science Results and Cross-Facility Synergies
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 強い棒渦巻銀河 NGC1300 における星形成の抑制 22019

    • Author(s)
      前田郁弥, 太田耕司, 牛尾海登 藤本裕輔, 羽部朝男
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Molecular clumps in a main sequence galaxy at z ~ 1.42019

    • Author(s)
      牛尾海登, 太田耕司, 前田郁弥, 矢部清人
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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