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Can Baryon-Dark Matter Streaming Motion Explain Supermassive Blackholes in the Early Universe?

Research Project

Project/Area Number 19K23455
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

Park Hyunbae  東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (40842985)

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)
KeywordsAstrophysics / Cosmology / Reionization / Hydrodynamics / Numerical simulation / Intergalactic medium / Galaxies / Blackholes / Radiative transfer / cosmology / astrophysics / early universe / first stars / numerical simulation / First stars / Gas dynamics / Blackhole
Outline of Research at the Start

We shall show that the streaming motion between gas and dark matter leads to formation of blackholes of ~100,000 solarmass when universe was 0.1 billion years old. Then, we shall study the signature of those blackholes to be observed by future giant telescopes and gravitational wave experiment.

Outline of Final Research Achievements

During the first billion years of cosmic history, a relative streaming motion between baryon and dark matter impeded gas accretion in dark matter clumps. We explored how this affected the structures of the early universe. We developed a code to accurately generate the initial gas/dark matter density field in the presence of the streaming. Then, we ran numerical simulations to evolve the density fluctuations into structures. We found that the streaming velocity can suppress the formation of small gas structures and reduce the recombination rate, thereby accelerating the ionization of the intergalactic gas by early galaxies. We are also finding that the streaming can cause a sudden collapse of gas into massive blackholes, which can be a progenitor of the supermassive blackhole we find at galactic centers. Lastly, we are investigating whether the streaming can create groups of stars completely devoid of dark matter, just like the globular clusters in today’s galaxies.

Academic Significance and Societal Importance of the Research Achievements

宇宙初期の天体形成は、宇宙進化を理解する上で最重要の課題の一つである。現在の宇宙に存在する銀河やブラックホールといった天体をシミュレーションで再現するには、137億年の宇宙史の間での複雑な効果を取り入れる必要があり、困難を伴う。対して本研究では宇宙開闢から約10億年を対象とするので正確に再現しやすい。ガスと暗黒物質の速度差を考慮した本研究を橋渡しとして、将来的には近傍宇宙の天体の再現が可能となる。

Report

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

    (26 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (9 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (14 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Int'l Joint Research] Chungnam National University/KASI/Chosun University(韓国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] NASA Goddard Center/University of Texas at Austin(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Universite de Strasbourg(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Sussex(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Chosun University/Korea Institute for Advanced Study(韓国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Scuola Normale Superiore(イタリア)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Harvard University/University of Texas at Austin(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Chosun University(韓国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] University of California at Riverside/University of Texas at Austin(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Large-scale Variation in Reionization History Caused by Baryon-Dark Matter Streaming Velocity2021

    • Author(s)
      Park Hyunbae、Shapiro Paul R.、Ahn Kyungjin、Yoshida Naoki、Hirano Shingo
    • Journal Title

      The Astrophysical Journal

      Volume: 908 Issue: 1 Pages: 96-107

    • DOI

      10.3847/1538-4357/abd7f4

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The impact of inhomogeneous subgrid clumping on cosmic reionization: II. Modelling stochasticity2021

    • Author(s)
      Bianco Michele、Iliev Ilian T、Ahn Kyungjin、Giri Sambit K、Mao Yi、Park Hyunbae、Shapiro Paul R
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 504 Issue: 2 Pages: 2443-2460

    • DOI

      10.1093/mnras/stab787

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First Structure Formation under the Influence of Gas-Dark Matter Streaming Velocity and Density: Impact of the “Baryons Trace Dark Matter” Approximation2020

    • Author(s)
      Park Hyunbae、Ahn Kyungjin、Yoshida Naoki、Hirano Shingo
    • Journal Title

      The Astrophysical Journal

      Volume: 900 Issue: 1 Pages: 30-30

    • DOI

      10.3847/1538-4357/aba26e

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Lyα Transmission in the Reionizing Intergalactic Medium2022

    • Author(s)
      Hyunbae Park
    • Organizer
      Reionization and Cosmic Dawn: Looking Forward To the Past
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Lyα Transmission in the Reionizing IGM: Infall Motion, HII Bubble Size, and Self-shielded Systems2021

    • Author(s)
      Hyunbae Park
    • Organizer
      SAZERAC2
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Intergalactic Medium During the Epoch of Reionization2021

    • Author(s)
      Hyunbae Park
    • Organizer
      Lawrence Berkeley National Lab Computational Cosmology Center Colloquium
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Scatter in Reionization History Induced by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Kavli IPMU Lunch Seminar
    • Related Report
      2020 Research-status Report
  • [Presentation] Scatter in Reionization History Induced by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      RESCEU summer school talk
    • Related Report
      2020 Research-status Report
  • [Presentation] Scatter in Reionization History Induced by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Kavli IPMU Colloquium
    • Related Report
      2020 Research-status Report
  • [Presentation] Large-scale Variation in Reionization History Caused by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Korea Institute for Advanced Study
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] First Structure Formation under the Influence of Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Tohoku Univ. First Star Meeting
    • Related Report
      2020 Research-status Report
  • [Presentation] Implication of Baryon-Dark Matter Streaming Velocity on Reionization2020

    • Author(s)
      Hyunbae Park
    • Organizer
      The 235th American Astronomy Society
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Does Baryon-Dark Matter Streaming Motion Accelerate the Cosmic Reionization?2020

    • Author(s)
      Hyunbae Park
    • Organizer
      National Astronomical Observatory of Japan
    • Related Report
      2019 Research-status Report
  • [Presentation] Can Baryon-Dark Matter Streaming Motion Accelerate the Cosmic Reionization?2020

    • Author(s)
      Hyunbae Park
    • Organizer
      University of Tokyo Astrophysics Seminar
    • Related Report
      2019 Research-status Report
  • [Presentation] Impact of the Baryon-Dark Matter Streaming Motion on the Epoch of Reionization2020

    • Author(s)
      Hyunbae Park
    • Organizer
      FirstStarIV
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Impact of Baryon-Dark Matter Streaming Velocity on Reionization2019

    • Author(s)
      Hyunbae Park
    • Organizer
      First Shanghai Assembly
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Implication of Baryon-Dark Matter Streaming Velocity on Reionization2019

    • Author(s)
      Hyunbae Park
    • Organizer
      Kavli IPMU Lunch Seminar
    • Related Report
      2019 Research-status Report

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

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