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2012 Fiscal Year Final Research Report

Research on the generation of cosmological magnetic field by the radiation from first objects

Research Project

  • PDF
Project/Area Number 22540295
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKonan University

Principal Investigator

SUSA Hajime  甲南大学, 理工学部, 教授 (00323262)

Co-Investigator(Renkei-kenkyūsha) TOMINAGA Nozomu  甲南大学, 理工学部, 准教授 (00550279)
Project Period (FY) 2010 – 2012
Keywords宇宙物理(理論) / 宇宙論
Research Abstract

We perform two dimensional radiation hydrodynamics simulations to assess the magnetic field in the neighbor of the minihalos which host populationIII stars. As a result, we find that the seed magnetic field strength generated by the radiation from these stars is 10^-17-10^-18G. In addition, we estimate the magnetic field generated on the accretion disk formed around populationIII protostars. Consequently, we obtain an order of magnitude stronger field strength than those found in the above calculation.2.Seed magnetic field generated in the early universe is amplified with time, and will play important roles in the subsequent star formation process. In order to understand the effects of magnetic field on star formation in the early universe, we investigate the coupling between gas and magnetic field in the course of the collapse of molecular cloud core of low metallicity. As a result,magnetic field couple with gas during the collapse if the metallicity is less than 10-7 solar, otherwise the magnetic field dissipates from the gas in a certain range of densities.

  • Research Products

    (12 results)

All 2012 2011 2010

All Journal Article (8 results) (of which Peer Reviewed: 4 results) Presentation (4 results)

  • [Journal Article] Formation and RadiativeFeedback of First Objects and First Galaxies2012

    • Author(s)
      Umemura, Masayuki;Susa, Hajime ;Kenji, Hasegawa
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: Vol.1

    • DOI

      Doi:10.1093/ptep/pts018

    • Peer Reviewed
  • [Journal Article] Dissipation of magnetic fields in low-metallicity clouds2012

    • Author(s)
      Doi, Kentaro, Susa, Hajime
    • Journal Title

      FIRST STARS IV -FROM HAYASHI TO THE FUTURE -. AIP

      Volume: Vol 1480 Pages: 349-351

    • DOI

      Doi: 10.1063/1.4754383

  • [Journal Article] Radiative feedback from proto-first-stars2012

    • Author(s)
      Susa, Hajime
    • Journal Title

      FIRST STARS IV - FROM HAYASHI TO THE FUTURE -. AIP Conference Proceedings

      Volume: Vol 1480 Pages: 67-70

    • DOI

      Doi: 10.1063/1.4754330

  • [Journal Article] SPH Radiative Hydrodynamics Methods2011

    • Author(s)
      Susa, Hajime
    • Journal Title

      Computational Star Formation, Proceedings of the International Astronomical Union, IAU Symposium

      Volume: Vol 270 Pages: 195-202

    • DOI

      Doi: 10.1017/S1743921311000366

    • Peer Reviewed
  • [Journal Article] Generation of a Seed Magnetic Field around First Stars: The Biermann Battery Effect2011

    • Author(s)
      Doi, Kentaro, Susa, Hajime
    • Journal Title

      The Astrophysical Journal

      Volume: Vol 741 Pages: article id.93

    • DOI

      Doi:10.1088/0004-637X/741/2/93

    • Peer Reviewed
  • [Journal Article] Generation of Magnetic Fields by Radiation Pressure from the First Stars2010

    • Author(s)
      Susa, Hajime; Ando, Masashi; Doi, Kentaro
    • Journal Title

      THE FIRST STARS AND GALAXIES: CHALLENGES FOR THE NEXT DECADE AIP Conference Proceedings

      Volume: Vol1294 Pages: 291-292

    • DOI

      Doi: 10.1063/1.3518883

  • [Journal Article] Generation of Seed Magnetic Field around First Stars2010

    • Author(s)
      Ando, Masashi; Doi, Kentaro; Susa, Hajime
    • Journal Title

      TOURS SYMPOSIUM ON NUCLEAR PHYSICS AND ASTROPHYSICS-VII. AIP Conference Proceedings

      Volume: Vol 1238 Pages: 133-135

    • DOI

      Doi:10.1063/1.3455916

  • [Journal Article] Generation of Seed Magnetic Field Around First Stars: Effects of Radiation Force2010

    • Author(s)
      Ando, Masashi; Doi, Kentaro; Susa, Hajime
    • Journal Title

      The Astrophysical Journal

      Volume: Vol 716 Pages: 1566-1572

    • DOI

      Doi: 10.1088/0004-637X/716/2/1566

    • Peer Reviewed
  • [Presentation] Dissipation of magnetic fields in low-metallicity clouds2012

    • Author(s)
      Doi, Kentaro
    • Organizer
      The low-metallicity Ism: Chemistry, turbulence and magneticfields
    • Place of Presentation
      ドイツ・ゲッチ ンゲン
    • Year and Date
      2012-10-11
  • [Presentation] PopIII.1星の質量降着期における光解離の影響について2011

    • Author(s)
      須佐元
    • Organizer
      初代星・初代銀河研究会
    • Place of Presentation
      福岡県福岡市九州大学・視聴覚ホール
    • Year and Date
      2011-12-20
  • [Presentation] 低金属量ガス雲からの磁場の散逸2011

    • Author(s)
      土井健太郎
    • Organizer
      日本天文学会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2011-09-21
  • [Presentation] さまざまな重元素量をもったガス雲からの磁場の散逸2011

    • Author(s)
      土井健太郎
    • Organizer
      日本天文学会
    • Place of Presentation
      筑波大学
    • Year and Date
      2011-03-17

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Published: 2014-08-29  

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