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Research for mass accretion process onto intermediate-mass black holes in protogalaxies

Research Project

Project/Area Number 21K20378
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 InstitutionThe University of Tokyo

Principal Investigator

Toyouchi Daisuke  東京大学, 大学院理学系研究科(理学部), 特任研究員 (30907374)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords大質量星 / ブラックホール / ガス降着 / 輻射流体シミュレーション / 輻射流体計算
Outline of Research at the Start

本研究では3次元輻射流体計算を行い、原始銀河内における1万太陽質量程度の超大質量星形成過程、及びその死後残される中間質量ブラックホールへのガス降着過程について調べる。銀河中心超巨大ブラックホール形成の解明に向けて、種となる中間質量ブラックホールがどのような質量分布で生まれ、その後どのように質量を獲得していくのか明らかにし、さらに初期宇宙における超大質量星及び中間質量ブラックホールの将来観測の可能性についても検証する。

Outline of Final Research Achievements

The formation mechanism of supermassive black holes (BHs) is still a big mystery, and the main bottleneck is uncertainty in how the seed black holes form and how rapidly they acquire mass via gas accretion. In this study, we have performed three-dimensional radiative hydrodynamic simulations to investigate the formation process of massive stars in the early universe and the gas accretion process onto BHs left after the progenitor star died. Our simulation results have enabled us to predict the mass distribution of remnant BHs and estimate the detectability of rapidly growing BHs in the early universe with the ongoing JWST observations.

Academic Significance and Societal Importance of the Research Achievements

初期宇宙で許される様々な星形成環境でシミュレーションを実施した結果、形成する初代星の質量は100太陽質量から10万太陽質量まで幅広い範囲に分布し、星質量と母体となるガス雲の密度、温度の間には密接な相関関係が存在するが明らかになった。私はこの関係と宇宙論的構造形成モデルを掛け合わせて初代星の質量分布を予言した。さらに星がBHへと進化した後もシミュレーションを続け、一部のBHが非常に急速な質量成長を経験することを示した。このように急速成長するBHはジェイムズ・ウェッブ宇宙望遠鏡などで観測できる可能性がある。これらの研究成果は超巨大BH形成の全貌解明に向けた大きな前進と言える。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Journal Article] Radiative feedback on supermassive star formation: the massive end of the Population III initial mass function2023

    • Author(s)
      Toyouchi, Daisuke; Inayoshi, Kohei; Li, Wenxiu; Haiman, Zoltan; Kuiper, Rolf
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 518 Issue: 2 Pages: 1601-1616

    • DOI

      10.1093/mnras/stac3191

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Top-heavy stellar mass distribution in galactic nuclei inferred from the universally high abundance ratio of [Fe/Mg]2022

    • Author(s)
      Toyouchi Daisuke、Inayoshi Kohei、Ishigaki Miho N、Tominaga Nozomu
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 512 Issue: 2 Pages: 2573-2583

    • DOI

      10.1093/mnras/stac640

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Formation and mass growth of seed black holes in protogalaxies2023

    • Author(s)
      豊内大輔
    • Organizer
      CfCAユーザーズミーティング
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Radiative feedback on supermassive star formation: Implication for the massive end of the PopIII IMF2022

    • Author(s)
      豊内大輔
    • Organizer
      Star formation in different environment
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Radiative feedback on supermassive star formation: Implication for the massive end of the PopIII IMF2022

    • Author(s)
      豊内大輔
    • Organizer
      EANAM9
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 原始銀河中の種ブラックホール形成および急速成長2022

    • Author(s)
      豊内大輔
    • Organizer
      初代星・初代銀河研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 原始銀河中の大質量星形成および種ブラックホールの成長2022

    • Author(s)
      豊内大輔
    • Organizer
      初代星・初代銀河研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Formation of intermediate-mass BHs in metal-free clouds experiencing violent dynamical heating2021

    • Author(s)
      豊内大輔
    • Organizer
      East-Asia AGN workshop 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 原始銀河中の種ブラックホール形成および急速成長2021

    • Author(s)
      豊内大輔
    • Organizer
      超巨大ブラックホール研究会
    • Related Report
      2021 Research-status Report
    • Invited

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Published: 2021-10-22   Modified: 2024-01-30  

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