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Establishing the scenario of the filament formation in low-mass star-forming regions with millimeter observations

Research Project

Project/Area Number 19K23463
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

SHIMAJIRI Yoshito  国立天文台, アルマプロジェクト, 特任准教授 (90610551)

Project Period (FY) 2019-08-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsフィラメント形成 / 星形成 / ミリ波 / 電波天文学
Outline of Research at the Start

宇宙赤外線望遠鏡ハーシェルによる星形成領域の観測から、0.1pc幅のフィラメント(細長い構造)が至るところで検出され、乱流によりフ ィラメントが形成、フィラメントの重力により周辺ガスがフィラメントへ流れ込み、 フィラメント質量が増加し重力不安定が起こり、フィラメントから星のもととなるコアへ分裂する、といったフィラメント形成シナリオが提唱されている。そのため、フィラメント形成の理解は、星形成の理解に直結する。本研究では、赤外線観測では得ることができなかった運動情報を電波観測により得ることで、運動学の観点からフィラメント形成過程を明らかにし、フィラメント形成シナリオの確立を目指す。

Outline of Final Research Achievements

The purpose of this study is to clarify the filament formation process from the viewpoint of kinematics and to establish a filament formation scenario by obtaining kinetic information through molecular line observations. In this study, the following two points were clarified. (1) By comparing the radial profiles of the continuum and multiple molecular emissions, we found that the filament width measured in each tracer shows a different width. (2) Comparison of the velocity structure-function between a simple model of the fragmenting filament and observed data indicates that the observed cores in the filaments were formed by fragmentation due to gravitational instability.

Academic Significance and Societal Importance of the Research Achievements

2010年ごろにいたるところで、フィラメント構造が検出されて以来、フィラメント形成の研究は注目を集めてきた。特に、そのフィラメントが0.1pcという特徴的な幅を持つか否かは、大きな論争を予備、10年以上たった今でも結論を得ていなかったが、本研究は、その糸口を示すことに成功した。また、大部分の星形成コアがフィラメント上にあることから、形態学的な証拠から、コアはフィラメントから分裂して形成されたと考えられていたが、本研究では、運動学的証拠から分裂を示すことに成功した。これらの成果は、星形成の理解において重要な星形成の母体であるフィラメントの形成の理解に大きく貢献したと言える。

Report

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

    (20 results)

All 2021 2020 Other

All Int'l Joint Research (13 results) Presentation (6 results) (of which Invited: 3 results) Remarks (1 results)

  • [Int'l Joint Research] CEA/Saclay(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Cardiff University/Universityof Central Lancashire(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Universidate do Porto(ポルトガル)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Crete(ギリシャ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] CEA/Saclay(フランス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Cardiff University/University of Central Lancashire(英国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Universidate do Porto(ポルトガル)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] University of Crete(ギリシャ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] CEA/Saclay(フランス)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Cardiff University/University of Central Lancashire(英国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Universidade do Porto(ポルトガル)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Foundation for Research and Technology(ギリシャ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Instituto Radioastronomia Milimetrica(スペイン)

    • Related Report
      2019 Research-status Report
  • [Presentation] 星間空間における大局的なガス分布と星形成フィラメント分子雲形成2021

    • Author(s)
      島尻芳人
    • Organizer
      様々なスケールの衝突流による誘発的星形成~大質量星から超大質量星団まで~
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Universality of star formation efficiency in dense molecular gas2021

    • Author(s)
      島尻芳人
    • Organizer
      銀河星形成研究会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Nobeyama Open-use Highlights I: Core And Filament Formation/Evolution In Natal Environments2021

    • Author(s)
      島尻芳人
    • Organizer
      ALMA/45m/ASTE users meeting
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] ミリ波サブミリ波で探るフィラメント形成2021

    • Author(s)
      島尻芳人
    • Organizer
      (サブ)ミリ波単一鏡の革新で挑む, 天文学の未解決問題
    • Related Report
      2020 Research-status Report
  • [Presentation] Witnessing the fragmentation of filaments into prestellar cores in Orion B/NGC 20242020

    • Author(s)
      島尻芳人
    • Organizer
      日本天文学会2020年秋季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Witnessing the fragmentation of filaments into prestellar cores in Orion B/NGC 20242020

    • Author(s)
      島尻芳人
    • Organizer
      Nobeyama Science WS 2020
    • Related Report
      2020 Research-status Report
  • [Remarks] https://sites.google.com/view/yoshitoshimajiri/top

    • Related Report
      2019 Research-status Report

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Published: 2019-09-03   Modified: 2023-01-30  

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