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GLAST衛星による銀河団ガンマ線放射の高感度探査

Research Project

Project/Area Number 09J04506
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Condensed matter physics I
Research InstitutionHiroshima University

Principal Investigator

西野 翔  広島大学, 大学院・理学研究科, 特別研究員(DC1)

Project Period (FY) 2009 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2011: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2010: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2009: ¥700,000 (Direct Cost: ¥700,000)
Keywords銀河団 / フェルミ衛星 / すざく衛星 / Fermi衛星
Research Abstract

私の研究対象である銀河団からのガンマ線放射は、Fermi衛星によって、未だ有意に検出されておらず、現在のところガンマ線フラックスの上限値として、10^-9~10^-8[photon/cm2/s](100MeV-300GeV)を与えるに留まっている。これは多くの理論研究者が、予想していた値よりも低いものであり、ガンマ線を放射する元となる宇宙線陽子のエネルギー密度が、銀河団において熱的エネルギーの10%以下であることを示している。そこで、今年度私は、フェルミ衛星により得られた上記の結果と、すざくX線衛星によって観測された銀河団の観測データを用いて、銀河団における高エネルギー現象についての研究を行った。
まず前年度から継続していた、すざく衛星を用いて観測した近傍銀河団A3627の解析結果を、投稿論文にまとめた(PASJ 64,16,2012)。この研究では、大質量の銀河団同士が互いに衝突する様子を明らかにしたもので、近傍宇宙の重力進化を議論する上で重要なサンプルになったと言える。続いて、すざく衛星により観測された銀河団の系統的解析を行った。すざく衛星に搭載された2つの検出器、XIS(2-10keV)とHXD-PIN(12-50keV)を用いて銀河団ガスの温度を精密測定したところ、HXD-PINで得られるガス温度が、XISで得られる温度よりも、系統的に高いことが分かった。これは、より高いエネルギーバンドに感度をもつHXD-PINが、銀河団の超高温ガスからの放射を選択的に捉えているためである。また、このような2つの検出器で得られるガス温度の食い違いは、衝突合体の兆候をしめす銀河団で、より発見されやすい傾向にあることが分かった。これは超高温ガスが、銀河団衝突によって生成されている描像を強く示唆する結果であり、銀河団の進化を研究する上で非常に重要な研究成果であると言える。これらの研究結果は、今年度、博士論文にまとめた。また現在、投稿論文にもまとめており、来年度中に発表する予定である。

Report

(3 results)
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (25 results)

All 2012 2011 2010 2009

All Journal Article (19 results) (of which Peer Reviewed: 18 results) Presentation (6 results)

  • [Journal Article] Suzaku observation of Nearby On-Going Merger Cluster Abell 36272012

    • Author(s)
      S.Nishino, et al
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 64

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Search for Gamma-ray Emission from X-Ray-selected Seyfert Galaxies with Fermi-LAT2012

    • Author(s)
      M.Ackermann, et al
    • Journal Title

      The Astrophysical Journal

      Volume: 747 Issue: 2 Pages: 104-120

    • DOI

      10.1088/0004-637x/747/2/104

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.12012

    • Author(s)
      M.Ajello, et al
    • Journal Title

      The Astrophysical Journal

      Volume: 744 Issue: 1 Pages: 80-80

    • DOI

      10.1088/0004-637x/744/1/80

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Suzaku View of X-Ray Spectral Variability of the Radio Galaxy Centaurus A : Partial Covering Absorber, Reflector, and Possible Jet Component2011

    • Author(s)
      Y.Fukazawa, et al
    • Journal Title

      The Astrophysical Journal

      Volume: 743 Issue: 2 Pages: 124-124

    • DOI

      10.1088/0004-637x/743/2/124

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fe-K Line Probing of Material Around the Active Galactic Nucleus Central Engine with Suzaku2011

    • Author(s)
      Y.Fukazawa, et al
    • Journal Title

      The Astrophysical Journal

      Volume: 727 Issue: 1 Pages: 19-19

    • DOI

      10.1088/0004-637x/727/1/19

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Improvements in Calibration of GSO Scintillators in the Suzaku Hard X-Ray Detector2011

    • Author(s)
      S.Yamada, et al
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 63 Pages: 645-656

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Radio/Gamma-Ray Connection in Active Galactic Nuclei in the Era of the Fermi Large Area Telescope2011

    • Author(s)
      M.Ackermann, et al
    • Journal Title

      The Astrophysical Journal

      Volume: 741 Issue: 1 Pages: 30-49

    • DOI

      10.1088/0004-637x/741/1/30

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fermi Large Area Telescope Observations of Markarian 421 : The Missing Piece of its Spectral Energy Distribution2011

    • Author(s)
      A.A.Abdo, et al
    • Journal Title

      The Astrophysical Journal

      Volume: 736 Issue: 2 Pages: 131-131

    • DOI

      10.1088/0004-637x/736/2/131

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fermi Gamma-ray Space Telescope Observations of the Gamma-ray Outburst from 3C454.3 in November 20102011

    • Author(s)
      A.A.Abdo, et al
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 733 Issue: 2 Pages: L26-L26

    • DOI

      10.1088/2041-8205/733/2/l26

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On-orbit calibration status of the hard x-ray detector (HXD) onboard Suzaku2010

    • Author(s)
      S.Nishino, et al.
    • Journal Title

      Space Telescopes and Instrumentation 2010 : Ultraviolet to Gamma Ray

      Volume: 7732 Pages: 81-93

    • Related Report
      2010 Annual Research Report
  • [Journal Article] Y-ray Spectral Evolution of NGC 1275 Observed with Fermi Large Area Telescope2010

    • Author(s)
      J.Kataoka, et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 715 Pages: 554-560

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fe-K Line Probing of Material Around the Active Galactic Nucleus Central Engine with Suzaku2010

    • Author(s)
      Y.Fukazawa, et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 721 Pages: 19-30

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Constraints on the Cosmic-ray Density Gradient Beyond the Solar Circle from Fermi Y-ray Observations of the Third Galactic Quadrant2010

    • Author(s)
      M.Ackermann, et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 728 Pages: 81-95

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Insights into the High-energy Y-ray Emission of Markarian 501 from Extensive Multifrequency Observations in the Fermi Era2010

    • Author(s)
      A.A.Abdo, et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 727 Pages: 129-154

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Detection of a Spectral Break in the Extra Hard Component of GRB 090926A2010

    • Author(s)
      M.Ackermann, et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 729 Pages: 114-125

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The First Fermi Multifrequency Campaign on BL Lacertae : Characterizing the Low-activity State of the Eponymous Blazar2010

    • Author(s)
      A.A.Abdo, et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 730 Pages: 101-114

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Study of the Large-Scale Temperature Structure of the Perseus Cluster with Suzaku2010

    • Author(s)
      S.Nishino, et al.
    • Journal Title

      PASJ : Publications of the Astronomical Society of Japan 62

      Pages: 9-18

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Large Area Telescope on the Fermi Gamma-Ray Space Telescope Mission2009

    • Author(s)
      W.B.Atwood, et al.
    • Journal Title

      ApJ : The Astrophysical Journal. 697

      Pages: 1071-1102

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The on-orbit calibration of the Fermi Large Area Telescope2009

    • Author(s)
      A.A.Abdo, et al.
    • Journal Title

      APh : Astroparticle Physics 32

      Pages: 193-219

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Presentation] すざく衛星による近傍の明るい銀河団Abell 3627の観測(II)2010

    • Author(s)
      西野翔, et al.
    • Organizer
      日本天文学会
    • Place of Presentation
      金沢大学
    • Year and Date
      2010-09-24
    • Related Report
      2010 Annual Research Report
  • [Presentation] 「すざく」衛星搭載硬X線検出器(HXD)主検出部の現状(IV)2010

    • Author(s)
      西野翔, et al.
    • Organizer
      日本天文学会
    • Place of Presentation
      広島大学
    • Year and Date
      2010-03-27
    • Related Report
      2009 Annual Research Report
  • [Presentation] On-orbit calibration status of the hard x-ray detector (HXD) onboard Suzaku2010

    • Author(s)
      S.Nishino, et al.
    • Organizer
      SPIE Optics+Photonics Hard X-ray and Gamma-ray Detector Physics
    • Place of Presentation
      Town and Country Resortand Convention Center, San Diego, California, USA
    • Related Report
      2010 Annual Research Report
  • [Presentation] Suzaku observation of the nearby merging cluster Abell 36272010

    • Author(s)
      S.Nishino, et al.
    • Organizer
      Galaxy clusters conference
    • Place of Presentation
      Garching bei Munchen, Germany
    • Related Report
      2010 Annual Research Report
  • [Presentation] すざく衛星による近傍の明るい銀河団Abell 3627の観測2009

    • Author(s)
      西野翔, et al.
    • Organizer
      日本天文学会
    • Place of Presentation
      山口大学
    • Year and Date
      2009-09-14
    • Related Report
      2009 Annual Research Report
  • [Presentation] Study of Large-scale Temperature Structure of the Perseus Cluster with Suzaku2009

    • Author(s)
      S.Nishino, et al.
    • Organizer
      The Energetic Cosmos : from Suzaku to Astro-H
    • Place of Presentation
      Otaru, Hokkaido
    • Related Report
      2009 Annual Research Report

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Published: 2009-04-01   Modified: 2024-03-26  

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