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大規模数値計算による初期宇宙での構造形成と銀河間物質の再電離過程の研究

Research Project

Project/Area Number 17684008
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionNagoya University

Principal Investigator

吉田 直紀  Nagoya University, 大学院・理学系研究科, 助教 (90377961)

Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥12,870,000 (Direct Cost: ¥9,900,000、Indirect Cost: ¥2,970,000)
Fiscal Year 2007: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2006: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2005: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Keywords宇宙物理 / 天文
Research Abstract

1 今年度は宇宙再電離に伴う銀河間物質の進化の研究の発展として、初代星からの紫外光により一旦電離されたガスから第二世代の星が生まれる様子のシミュレーションを行った。
昨年度の研究では星形成分子ガス雲が形成されるまでにとどまっていたが、さらに質量解像度を高める手法を適用して、第二世代の原始星形成まで詳細に調べた。3次元シミュレーションから得られたガス降着率を用いて原始星進化の計算をおこない、第二世代の星は質量がおよそ数十倍程度になることを示した。
2 第一世代星が進化の最終段階に、重力崩壊によっておよそ100太陽質量程度のブラックホールを残す場合の宇宙論的構造形成シミュレーションを行った。ブラックホールが宇宙論的環境の中でその後どのように進化し、宇宙年齢10億年の頃までに観測から示唆されるような巨大質量ブラックホールに成長できるかを調べた。ブラックホールへのガス降着率が理論的に可能な上限に近い場合のみ、十分な質量にまで成長することができると示し、またそのような巨大ブラックホールを含む遠方のクエーサーの電波特性を議論した。

Report

(3 results)
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (18 results)

All 2008 2007 2006 2005 Other

All Journal Article (12 results) (of which Peer Reviewed: 2 results) Presentation (3 results) Book (2 results) Remarks (1 results)

  • [Journal Article] Modeling the Dust Properties of z=6 Quasars with ART All-Wavelength Radiative Transfer with Adaptive Refinement Tree2008

    • Author(s)
      Y.Li, 他7名, 吉田直紀
    • Journal Title

      Astrophysical Journal 678

      Pages: 41-63

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Formation of Massive Primordial Stars in a Reionized gas2007

    • Author(s)
      吉田直紀、大向一行、Lars Hernquist
    • Journal Title

      Astrophysical Journal Letters 667

      Pages: 117-120

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Early Cosmological HII/HeIII Regions and Their Impact on Second Generation Star Formation2007

    • Author(s)
      吉田直紀, S.-P.Oh, 北山哲, L.Hernquist
    • Journal Title

      Astrophysical Journal 663(未定)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] The First Generation of Stars in the LCDM Cosmology2007

    • Author(s)
      L.Gao, 吉田直紀, T.Abel, C.Frenk, A.Jenkins, V.Springel
    • Journal Title

      Monthly Notices of the Royal Astronomical Society (未定)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Early Structure Formation in Quintessence Models and Its Implications for Cosmic Reionization from First Stars2007

    • Author(s)
      U.Maio, K.Dolag, M.Meneghetti, L.Moscardini, 吉田直紀 他3名
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 373

      Pages: 869-869

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Formation of Primordial Stars in a LCDM Universe2006

    • Author(s)
      吉田直紀, 大向一行, L.Hernquist, T.Abel
    • Journal Title

      Astrophysical Journal 652

      Pages: 6-6

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A Merger Driven Scenario for Cosmological Disk Galaxy Formation2006

    • Author(s)
      B.Robertson, L.Hernquist, T.Matteo, J.Bullock, V.Springel, 吉田直紀
    • Journal Title

      Astrophysical Journal 645

      Pages: 986-986

    • Related Report
      2006 Annual Research Report
  • [Journal Article] From the First Stars to the First Galaxies2006

    • Author(s)
      吉田直紀
    • Journal Title

      New Astronomy Reviews 50

      Pages: 19-19

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Voids in a Lambda CDM universe2006

    • Author(s)
      J.Colberg, R.Sheth, A.Diaferio, G.Liang, 吉田直紀
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 360

      Pages: 216-216

    • Related Report
      2005 Annual Research Report
  • [Journal Article] The Many Lives of AGN : Cooling Flows, Black Holes and the Colors of Galaxies2005

    • Author(s)
      D.Croton 他(9名中9番目)
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 365

      Pages: 11-11

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Supernova Explosions in the Early Universe : Evolution of Radiative Remnants and the Halo Destruction Efficiency2005

    • Author(s)
      北山哲, 吉田直紀
    • Journal Title

      Astrophysical journal 630

      Pages: 675-675

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Siimulations of the Formation, Evolution and Clustering of Galaxies and Quasars2005

    • Author(s)
      V.Springel, S.White, A.Jenkins, C.Frenk, 吉田直紀, G.Liang他11名
    • Journal Title

      Nature 435

      Pages: 629-629

    • Related Report
      2005 Annual Research Report
  • [Presentation] Formation of the First Stars in the Universe2007

    • Author(s)
      吉田直紀
    • Organizer
      10th Origin of Matter and Evolution of Galaxies
    • Place of Presentation
      札幌
    • Year and Date
      2007-12-04
    • Related Report
      2007 Annual Research Report
  • [Presentation] Star-Formation in Second Generation Proto-Galaxies2007

    • Author(s)
      吉田直紀
    • Organizer
      Star Formation Through Cosmic Time
    • Place of Presentation
      米国サンタバーバラ
    • Year and Date
      2007-08-15
    • Related Report
      2007 Annual Research Report
  • [Presentation] Formation of Primordial Protostars in a LCDM Universe2007

    • Author(s)
      吉田直紀
    • Organizer
      First Stars III
    • Place of Presentation
      米国サンタフェ
    • Year and Date
      2007-07-14
    • Related Report
      2007 Annual Research Report
  • [Book] 現代の天文学4 銀河(1) 銀河と宇宙の階層構造2007

    • Author(s)
      谷口義明, 他
    • Publisher
      日本評論社
    • Related Report
      2007 Annual Research Report
  • [Book] 現代の天文学14 シミュレーション天文学2007

    • Author(s)
      富阪幸治, 他
    • Publisher
      日本評論社
    • Related Report
      2007 Annual Research Report
  • [Remarks]

    • URL

      http://www.a.phys.nagoya-u.ac.jp/~nyoshida/firststar.html

    • Related Report
      2007 Annual Research Report

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

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