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Origin of Nuclear Star Cluster of Milky Way

Research Project

Project/Area Number 16K05308
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Astronomy
Research InstitutionJapan Aerospace EXploration Agency

Principal Investigator

TSUBOI Masato  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (10202186)

Co-Investigator(Kenkyū-buntansha) 宮脇 亮介  桜美林大学, 自然科学系, 教授 (90209958)
Research Collaborator KITAMURA yoshimi  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords銀河系中心 / 星間分子雲 / 巨大星団 / 星生成 / 分子雲分子雲衝突 / 中間質量ブラックホール / 巨大ブラックホール / 大質量星 / 星形成 / 星団形成 / ブラックホール / 天文学
Outline of Final Research Achievements

In order to clarify the supply process of material to the Galactic Center (GC) and the origin of the Nuclear Star Cluster (NSC), the structures and kinematics of the ionized gas and molecular gas in the vicinity of the GC have been observed from the Atacama Large Millimeter/submillimeter Array (ALMA). It was found that the formation of early-type stars is promoted in the 50km/s molecular cloud closest to the GC. Some of the molecular clouds are falling to the GC while being tidal destroyed. On the way, it is ionized by the UV from the NSC itself and it turns into falling ionized gas streamers. However, the star formation proceeds and the surrounding gas should be stripped by the ambient ionized gas. We obtained the observation evidences about these. Some of these early-type stars will join the NSC and the rest will be scattered out of the GC.

Academic Significance and Societal Importance of the Research Achievements

バリオンの宇宙を構成する恒星がどうできたかは天文学の主要テーマである。現在までに銀河円盤部での中小質量星の生成過程のシナリオは確定しつつある。一方大質量星の生成、銀河中心部での星生成等は研究が始まったばかりといえる。本研究は最新の観測装置であるALMAを用いて銀河中心部での大質量星の生成過程のシナリオを観測的に明らかにしようとするものであった。観測結果はどれも「星は周辺で作られて分子雲とともに中心に落下して中心星団に加わる」という作業仮説と矛盾しないものであった。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (32 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (3 results) Journal Article (7 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (22 results) (of which Int'l Joint Research: 11 results,  Invited: 1 results)

  • [Int'l Joint Research] National Radio Astronomy Observatory(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] 国立電波天文台(米国)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] 国立電波天文台(NRAO)(米国)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Molecular Cloud Cores in the Galactic Center 50 km s-1 Molecular Cloud2019

    • Author(s)
      Uehara, Kenta; Tsuboi, Masato; Kitamura, Yoshimi; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Journal Title

      The Astrophysical Journal

      Volume: 872 Issue: 2 Pages: 121-121

    • DOI

      10.3847/1538-4357/aafee7

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] ALMA view of the circumnuclear disk of the Galactic Center: tidally disrupted molecular clouds falling to the Galactic Center2018

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Uehara, Kenta; Tsutsumi, Takahiro; Miyawaki, Ryosuke; Miyoshi, Makoto; Miyazaki, Atsushi
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 70 Issue: 5

    • DOI

      10.1093/pasj/psy080

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Second Galactic Center Black Hole? A Possible Detection of Ionized Gas Orbiting around an IMBH Embedded in the Galactic Center IRS13E Complex2017

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Tsutsumi, Takahiro; Uehara,Kenta; Miyoshi,Makoto; Miyawaki,Ryosuke; Miyazaki, Atsushi
    • Journal Title

      The Astrophysical journal., Letter

      Volume: 850 Issue: 1 Pages: L5-L5

    • DOI

      10.3847/2041-8213/aa97d3

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] ALMA View of the Galactic Center Minispiral: Ionized Gas Flows around Sagittarius A*2017

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Uehara, Kenta; Miyawaki, Ryosuke; Tsutsumi, Takahiro; Miyazaki, Atsushi; Miyoshi, Makoto
    • Journal Title

      The Astrophysical Journal

      Volume: 842 Issue: 2 Pages: 94-94

    • DOI

      10.3847/1538-4357/aa74e3

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Tidally-disrupted Molecular Clouds falling to the Galactic Center2017

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Uehara, Kenta; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Journal Title

      The Multi-Messenger Astrophysics of the Galactic Centre, Proceedings of the IAU Symposium

      Volume: 322 Issue: S322 Pages: 115-118

    • DOI

      10.1017/s1743921316012047

    • Related Report
      2016 Research-status Report
    • Open Access
  • [Journal Article] ALMA view of the Galactic Center 50km/s molecular cloud2017

    • Author(s)
      Uehara, Kenta; Tsuboi, Masato; Kitamura, Yoshimi; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Journal Title

      The Multi-Messenger Astrophysics of the Galactic Centre, Proceedings of the IAU Symposium

      Volume: 322 Issue: S322 Pages: 162-163

    • DOI

      10.1017/s1743921316011984

    • Related Report
      2016 Research-status Report
    • Open Access
  • [Journal Article] Galactic center mini-spiral by ALMA: Possible origin of the central cluster2016

    • Author(s)
      Masato TSUBOI, Yoshimi KITAMURA, Makoto MIYOSHI, Kenta UEHARA, Takahiro TSUTSUMI, and Atsushi MIYAZAKI
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 68(3) Issue: 3

    • DOI

      10.1093/pasj/psw031

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ALMA View of the Circum-nuclear Disk of the Galactic Center2018

    • Author(s)
      Masato Tsuboi
    • Organizer
      日本天文学会2018年秋季年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Sub-millimeter Detection of the IR Stars around Sgr A* by ALMA2018

    • Author(s)
      Masato Tsuboi
    • Organizer
      日本天文学会2018年春季年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Intricate Ionized Gas Flows Approaching to Sgr A*2018

    • Author(s)
      Masato Tsuboi
    • Organizer
      日本天文学会2018年春季年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 銀河系中心50km/s分子雲の星形成分子雲コア2018

    • Author(s)
      上原顕太
    • Organizer
      日本天文学会2018年春季年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Intermediate Mass Black Holes within the 0.5 pc of the Galactic Center2018

    • Author(s)
      Masato Tsuboi
    • Organizer
      East Asian ALMA Science Workshop 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Intricate Ionized Gas Flows Approaching to Sgr A*2018

    • Author(s)
      Tsuboi, Masato
    • Organizer
      日本天文学会春季年会 2018
    • Related Report
      2017 Research-status Report
  • [Presentation] The Second Black Hole near the Galactic Center?2017

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Uehara, Kenta; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Organizer
      Black Hole Astrophysics with VLBI: Past, Present, and Future
    • Place of Presentation
      国立天文台、三鷹
    • Year and Date
      2017-03-27
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Detection of Accreting Ionized Gas onto the Galactic Center IRS13E2017

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Miyoshi, Makoto; Uehara, Kenta; Tsutsumi, Takahiro; Miyazaki, Atsushi
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      九州大学
    • Year and Date
      2017-03-15
    • Related Report
      2016 Research-status Report
  • [Presentation] 分子雲衝突による銀河系中心 50km/s 分子雲での大質量星形成2017

    • Author(s)
      上原顕太, 坪井昌人, 北村良実, 宮脇亮介, 宮崎敦史
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      九州大学
    • Year and Date
      2017-03-15
    • Related Report
      2016 Research-status Report
  • [Presentation] 銀河系中心 50km/s 分子雲で発見された分子雲フィラメント2017

    • Author(s)
      上原顕太, 坪井昌人, 北村良実, 宮脇亮介, 宮崎敦史
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      九州大学
    • Year and Date
      2017-03-15
    • Related Report
      2016 Research-status Report
  • [Presentation] The Second Galactic Center Black Hole?2017

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Miyoshi, Makoto; Uehara, Kenta; Tsutsumi, Takahiro; Miyazaki, Atsushi
    • Organizer
      EA-ALMA Scientific Workshop 2016
    • Place of Presentation
      National Tsing Hua Univ. Taiwan
    • Year and Date
      2017-03-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Massive Star Formation in the Galactic Center 50km/s Molecular Cloud revealed by ALMA2017

    • Author(s)
      Uehara, Kenta; Tsuboi, Masato; Kitamura, Yoshimi; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Organizer
      EA-ALMA Scientific Workshop 2016
    • Place of Presentation
      National Tsing Hua Univ. Taiwan
    • Year and Date
      2017-03-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Microscopic World of the Galactic Center Opened by ALMA2017

    • Author(s)
      Masato Tsuboi
    • Organizer
      EA-ALMA Scientific Workshop 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A Possible Detection of Compact Accreting Ionized Flow onto the Galactic Center IRS13E32017

    • Author(s)
      Masato Tsuboi
    • Organizer
      ALMA Long Baseline Workshop
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] ALMA view of the massive dense core in the Galactic center 50km/s molecular cloud2017

    • Author(s)
      Kenta Uehara, Masato Tsuboi, Yoshimi Kitamura, Ryosuke Miyawaki, Astushi Miyazaki
    • Organizer
      Francesco’s Legacy: Star Formation in Space and Time
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] ALMA View of the Circum-nuclear Disk of the Galactic Center2017

    • Author(s)
      Tsuboi, Masato
    • Organizer
      日本天文学会秋季年会 2017
    • Related Report
      2017 Research-status Report
  • [Presentation] ALMA View of the Galactic Center Mini-Spiral2016

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Miyoshi, Makoto; Uehara, Kenta; Tsutsumi, Takahiro; Miyazaki, Atsushi
    • Organizer
      Half a Decade of ALMA: Cosmic Dawns Transformed
    • Place of Presentation
      Indian Wells, CA, USA
    • Year and Date
      2016-09-20
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Filamentary Structures of the Galactic Center 50km/s Molecular Cloud with ALMA2016

    • Author(s)
      Uehara, Kenta; Tsuboi, Masato; Kitamura, Yoshimi; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Organizer
      Half a Decade of ALMA: Cosmic Dawns Transformed
    • Place of Presentation
      Indian Wells, CA, USA
    • Year and Date
      2016-09-20
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] ALMAによる銀河系中心ミニスパイラルの観測2016

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Miyoshi, Makoto; Uehara, Kenta; Tsutsumi, Takahiro; Miyazaki, Atsushi
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      愛媛大学
    • Year and Date
      2016-09-14
    • Related Report
      2016 Research-status Report
  • [Presentation] 銀河系中心 50km/s 分子雲でのフィラメント構造の同定2016

    • Author(s)
      上原顕太, 坪井昌人, 北村良実, 宮脇亮介, 宮崎敦史
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      愛媛大学
    • Year and Date
      2016-09-14
    • Related Report
      2016 Research-status Report
  • [Presentation] Tidally-disrupted Molecular Clouds falling to the Galactic Center2016

    • Author(s)
      Tsuboi, Masato; Kitamura, Yoshimi; Uehara, Kenta; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Organizer
      IAU322;The Multi-Messenger Astrophysics of the Galactic Centre
    • Place of Presentation
      Palm Cove, QL, Australia
    • Year and Date
      2016-07-18
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] ALMA view of the Galactic Center 50km/s molecular cloud2016

    • Author(s)
      Uehara, Kenta; Tsuboi, Masato; Kitamura, Yoshimi; Miyawaki, Ryosuke; Miyazaki, Atsushi
    • Organizer
      IAU322;The Multi-Messenger Astrophysics of the Galactic Centre
    • Place of Presentation
      Palm Cove, QL, Australia
    • Year and Date
      2016-07-18
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2022-02-21  

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