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Precise Measurements of the Hubble Constant and Structures of Clusters of Galaxies

Research Project

Project/Area Number 14540230
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionKyoto Sangyo University

Principal Investigator

MIYOSHI Shigeru  Kyoto Sangyo University, Faculty of Science, Professor, 理学部, 教授 (90065855)

Co-Investigator(Kenkyū-buntansha) TAWARA Yuzuru  Nagoya University, Eco Topia Science Institute, Professor, エコトピア科学研究機構, 教授 (10135296)
HARA Tetsuya  Kyoto Sangyo University, Faculty of Science, Professor, 理学部, 教授 (00121541)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywordsclusters of galaxies / high temperature plasma / Sunvaev-Zel'dovich effect / Hubble constant / dark matter / density fluctuation / gravitational lensing / density distribution / 密度ゆらぎ / X線天文学 / 天体プラズマ / 宇宙膨張 / X線表面輝度分布 / ダークマター / 等温ベータモデル
Research Abstract

On the theoretical and observational investigations of the structure of clusters of galaxies, we established a new model of intracluster gas distribution. The fitting of our model with observational data is considerably better than the isothermal beta model, and the cluster mass distribution derived by using our model has a tendency to solve the discrepancy between the values obtained from the X-ray and the gravitational-lensing data. We made also the analysis of X-ray data of A2029 obtained with XMM-Newton. A2029 is a typical cD-type cluster of galaxies having a giant cD galaxy in the center. Although the data analysis of this cluster is still going on, many interesting results have been obtained. For example, in the central region a two-temperature model is preferred to some ordinary single temperature models.
On the measurement of the Hubble constant, Ho, using the Sunyaev-Zel'dovich effect, we succeeded to obtain available data for five distant (0.143【less than or equal】z【less than or equal】0.282) clusters of galaxies observed with ROSAT, ASCA (X-ray) and the Ryle Telescope (radio). The obtained value of Ho for these clusters are considerably scattered, and their mean value is 66+11/-10 (random) +9/-8 (systematic) km/s/Mpc for a ACDM (ΩM=0.3, ΩA=0.7) flat universe. This value of Ho is slightly less than the value of Ho=71±2 km/s/Mpc obtained from WMAP observations of the cosmic microwave background radiation, but they are in good agreement within their errors.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (13 results)

All 2005 2004 2003 Other

All Journal Article (10 results) Publications (3 results)

  • [Journal Article] Ho from an orientation-unbiased sample of Sunyaev-Zel'dovich and X-ray clusters2005

    • Author(s)
      M.E.Jones, S.J.Miyoshi, Y.Tawara, 他11名
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 357

      Pages: 518-526

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] ASCA and XMM-Newton Observations of A20292005

    • Author(s)
      S.Miyoshi, 他6名
    • Journal Title

      Advances in Space Research (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Ho from an orientation-unbiased sample of Sunyaev-Zel'dovich and X-ray clusters2005

    • Author(s)
      M.E.Jones, A.C.Edge, K.Grainge, W.F.Grainger, R.Kneissl, G.G.Pooley, R.Saunders, S.J.Miyoshi, T.Tsuruta, K.Yamashita, Y.Tawara, A.Furuzawa, A.Harada, I.Hatsukade
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 357

      Pages: 518-526

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] ASCA and XMM-Newton Observations of A20292005

    • Author(s)
      S.Miyoshi, N.Tanaka, M.Yoshimura, K.Yamashita, A.Furuzawa, T.Futamura, M.Hudaverdi
    • Journal Title

      Advances in Space Research (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] H_0 from an orientation-unbiased sample of Sunyeaev-Zel'dovich and X-ray clusters2005

    • Author(s)
      M.E.Jones, S.MIyoshi, Y.Tawara 他11名
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 357

      Pages: 518-526

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Tracing Bright and Dark Sides of the Universe with X-ray Observations2004

    • Author(s)
      Y.Suto, Y.Tawara, 他12名
    • Journal Title

      Journal of the Korean Astronomical Society 37

      Pages: 387-392

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Tracing Bright and Dark Sides of the Universe with X-ray Observations2004

    • Author(s)
      Y.Suto, K.Yoshikawa, K.Dolag, S.Sasaki, N.Yamasaki, T.Ohashi, K.Matsuda, Y.Tawara, R.Fujimoto, T.Furusho, 4 coauthors
    • Journal Title

      Journal of the Korean Astronomical Society 37

      Pages: 387-392

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Tracing Bright and Dark Sides of the Universe with X-ray Obsevations2004

    • Author(s)
      Y.Suto, Y.Tawara 他12名
    • Journal Title

      Journal of the Korean Astronomical Scociety 37

      Pages: 387-392

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A measurement of Ho from Ryle telescope, ASCA and ROSAT observations of Abell 7732003

    • Author(s)
      R.Saunders, S.J.Miyoshi, Y.Tawara, 他14名
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 341

      Pages: 937-940

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] A measurement of Ho from Ryle telescope, ASCA and ROSAT observations of Abell 7732003

    • Author(s)
      R.Saunders, R.Kneissl, K.Grainge, W.F.Grainger, M.E.Jones, A.Maggi, R.Das, A.C.Edge, A.N.Lasenby, G.G.Pooley, S.J.Miyoshi, T.Tsuruta, K.Yamashita, Y.Tawara, A.Furuzawa, A.Harada, I.Hatsukade
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 341

      Pages: 937-940

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] R.Saunders, S.J.Miyoshi, Y.Tawara 他14名: "A measurement of Ho from Ryle Telescope, ASCA and ROSAT observations of Abell 773"Monthly Notices of the Royal Astronomical Society. 341. 937-940 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 中井三留, 瀬川重男: "被覆面の型"数理解析研究所講究録. 1277. 84-93 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Masaharu Nishio, Katsunori Shimomura: "A characterization of caloric morphisms between manifolds"Ann.Acad.Sci.Fenn.Math.. (to appear).

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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