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2018 Fiscal Year Annual Research Report

Theoretical study on binary black hole formation

Planned Research

Project AreaGravitational wave physics and astronomy: Genesis
Project/Area Number 17H06360
Research InstitutionTohoku University

Principal Investigator

大向 一行  東北大学, 理学研究科, 教授 (70390622)

Co-Investigator(Kenkyū-buntansha) 須佐 元  甲南大学, 理工学部, 教授 (00323262)
町田 正博  九州大学, 理学研究院, 准教授 (10402786)
細川 隆史  京都大学, 理学研究科, 准教授 (30413967)
藤井 通子  東京大学, 大学院理学系研究科(理学部), 准教授 (90722330)
谷川 衝  東京大学, 大学院総合文化研究科, 助教 (20550742)
Project Period (FY) 2017-06-30 – 2022-03-31
Keywordsブラックホール / 連星形成 / 星形成
Outline of Annual Research Achievements

宇宙初期の連星形成過程において星形成ガス雲収縮時の角運動量輸送は非常に重要である。角運動量は磁場を通じて輸送されると考えられるため、磁場とガスとの結合度合いを決定するガス中の電離ので精密なモデル化を行う必要がある。そこで昨年度の研究において構築した、始原ガス中での電離度を広い密度領域で計算できる化学反応ネットワークを重元素及びダストを含む場合に拡張中である。
また始原星の大質量連星形成の輻射流体シミュレーションをを用いて行うために、AMRコードSFMATOにray-tracing法による輻射輸送モジュールを実装した。次年度以後、このコードを使用して、数値シミュレーションを実行する。
高密度星団内部における多体重力相互作用の結果、連星ブラックホールが形成される過程に関して、比較的小さな散開星団中での形成確率を重力多体系計算により見積もった。これは主系列星の連星をまず経由して、その後、それらが寿命を終えて連星ブラックホールとなるという経路をたどることが見いだされた。散開星団の数の多さを考慮すると、この経路は連星ブラックホールの起源として無視できない寄与をする可能性がある。
最後に、これまで連星進化の種族合成モデルには太陽の1/100以下の低金属度のデータが十分ではなかったので、星の進化計算を網羅的に行い、それを解析関数でフィットすることにより種族合成モデルを整備した。今後の計画では、このモデルを重力多体系計算と組み合わせることでより重力波イベント数のより定量的な見積もりが可能となる。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

当初の研究計画とほぼ同じスケジュールで研究が遂行できている。

Strategy for Future Research Activity

これまでほぼ当初の研究計画どおり研究を遂行出来ているので、今後も代表者と分担者、研究協力者は一致協力、鋭意努力を継続して当初計画のまま推進する予定である。

  • Research Products

    (21 results)

All 2019 2018 Other

All Int'l Joint Research (4 results) Journal Article (15 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 15 results) Presentation (2 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Int'l Joint Research] Peking University(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      Peking University
  • [Int'l Joint Research] Sapienza University of Rome(イタリア)

    • Country Name
      ITALY
    • Counterpart Institution
      Sapienza University of Rome
  • [Int'l Joint Research] University of Tuebingen(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      University of Tuebingen
  • [Int'l Joint Research] University of Leiden(オランダ)

    • Country Name
      NETHERLANDS
    • Counterpart Institution
      University of Leiden
  • [Journal Article] Property of young massive clusters in a galaxy?galaxy merger remnant2019

    • Author(s)
      Matsui Hidenori、Tanikawa Ataru、Saitoh Takayuki R
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 71 Pages: id 19

    • DOI

      10.1093/pasj/psy139

    • Peer Reviewed
  • [Journal Article] Condition for dust evacuation from the first galaxies2018

    • Author(s)
      Fukushima Hajime、Yajima Hidenobu、Omukai Kazuyuki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 477 Pages: 1071~1085

    • DOI

      10.1093/mnras/sty799

    • Peer Reviewed
  • [Journal Article] Stunted accretion growth of black holes by combined effect of the flow angular momentum and radiation feedback2018

    • Author(s)
      Sugimura Kazuyuki、Hosokawa Takashi、Yajima Hidenobu、Inayoshi Kohei、Omukai Kazuyuki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 478 Pages: 3961~3975

    • DOI

      10.1093/mnras/sty1298

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Condition for low-mass star formation in shock-compressed metal-poor clouds2018

    • Author(s)
      Nakauchi Daisuke、Omukai Kazuyuki、Schneider Raffaella
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 480 Pages: 1043~1056

    • DOI

      10.1093/mnras/sty1911

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Evolution of magnetic fields in collapsing star-forming clouds under different environments2018

    • Author(s)
      Higuchi Koki、Machida Masahiro N、Susa Hajime
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 475 Pages: 3331~3347

    • DOI

      10.1093/mnras/sty046

    • Peer Reviewed
  • [Journal Article] Metal-poor star formation triggered by the feedback effects from Pop III stars2018

    • Author(s)
      Chiaki Gen、Susa Hajime、Hirano Shingo
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 475 Pages: 4378~4395

    • DOI

      10.1093/mnras/sty040

    • Peer Reviewed
  • [Journal Article] Radiation Hydrodynamics Simulations of Photoevaporation of Protoplanetary Disks by Ultraviolet Radiation: Metallicity Dependence2018

    • Author(s)
      Nakatani Riouhei、Hosokawa Takashi、Yoshida Naoki、Nomura Hideko、Kuiper Rolf
    • Journal Title

      The Astrophysical Journal

      Volume: 857 Pages: 57~57

    • DOI

      10.3847/1538-4357/aab70b

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Radiation hydrodynamics simulations of the formation of direct-collapse supermassive stellar systems2018

    • Author(s)
      Chon Sunmyon、Hosokawa Takashi、Yoshida Naoki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 475 Pages: 4104~4121

    • DOI

      10.1093/mnras/sty086

    • Peer Reviewed
  • [Journal Article] The Impact of Feedback in Massive Star Formation. II. Lower Star Formation Efficiency at Lower Metallicity2018

    • Author(s)
      Tanaka Kei E. I.、Tan Jonathan C.、Zhang Yichen、Hosokawa Takashi
    • Journal Title

      The Astrophysical Journal

      Volume: 861 Pages: 68~68

    • DOI

      10.3847/1538-4357/aac892

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First hydrodynamics simulations of radiation forces and photoionization feedback in massive star formation2018

    • Author(s)
      Kuiper R.、Hosokawa T.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 616 Pages: A101~A101

    • DOI

      10.1051/0004-6361/201832638

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Radiation Hydrodynamics Simulations of Photoevaporation of Protoplanetary Disks. II. Metallicity Dependence of UV and X-Ray Photoevaporation2018

    • Author(s)
      Nakatani Riouhei、Hosokawa Takashi、Yoshida Naoki、Nomura Hideko、Kuiper Rolf
    • Journal Title

      The Astrophysical Journal

      Volume: 865 Pages: 75~75

    • DOI

      10.3847/1538-4357/aad9fd

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Episodic excursions of low-mass protostars on the Hertzsprung?Russell diagram2018

    • Author(s)
      Elbakyan Vardan G、Vorobyov Eduard I、Rab Christian、Meyer Dominique M-A、G?del Manuel、Hosokawa Takashi、Yorke Harold
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 484 Pages: 146~160

    • DOI

      10.1093/mnras/sty3517

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The dynamics of stellar discs in live dark-matter haloes2018

    • Author(s)
      Fujii M S、Bedorf J、Baba J、Portegies Zwart S
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 477 Pages: 1451~1471

    • DOI

      10.1093/mnras/sty711

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Modelling the Milky Way as a dry Galaxy2018

    • Author(s)
      Fujii M S、Bedorf J、Baba J、Portegies Zwart S
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 482 Pages: 1983~2015

    • DOI

      10.1093/mnras/sty2747

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Metal pollution of low-mass Population III stars through accretion of interstellar objects like ‘Oumuamua2018

    • Author(s)
      Tanikawa Ataru、Suzuki Takeru K、Doi Yasuo
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 70 Pages: id 80

    • DOI

      10.1093/pasj/psy075

    • Peer Reviewed
  • [Presentation] From First Stars to First Black Holes2018

    • Author(s)
      Kazuyuki Omukai
    • Organizer
      The early growth of supermassive black holes
    • Int'l Joint Research / Invited
  • [Presentation] Feedback from accreting seed black holes and progenitor stars2018

    • Author(s)
      Takashi Hosokawa
    • Organizer
      The early growth of supermassive black holes
    • Int'l Joint Research / Invited

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Published: 2021-01-27  

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