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2005 Fiscal Year Final Research Report Summary

Unveiling Galaxy Formation and Cosmic StarFormation History with Dusty Spectrum Energy Distribution Diagnostics

Research Project

Project/Area Number 14540220
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionIwate University

Principal Investigator

HANAMI Hitoshi  Iwate University, Faculty of Social Sciences and Humanities, Associate, 人文社会科学部, 教授 (00212150)

Project Period (FY) 2002 – 2005
KeywordsGalaxy Formation / Starburst / Dust / Submillimetre Wavelength / Millimetre Wavelength / Infrared Light
Research Abstract

We analyse the spectral energy distributions (SEDs) of 30 submm galaxies, including EROs and host galaxies of GRBs, by using an evolutionary SED model of starbursts. From the observed UV-submm SEDs, we predict the present-day colours and magnitudes of submm galaxies. And then compare them with the colour- and size-magnitude relation of elliptical galaxies. With the top-heavy IMF, the present-day colours and magnitudes of submm galaxies are found to be consistent with the colour-magnitude relation of elliptical galaxies. We find that the mean present-day magnitude of submm galaxies corresponds to that of $L^A*$ elliptical galaxies. The derived effective radii of less massive submm galaxies are consistent with the observed effective radius of elliptical galaxies, while massive submm galaxies are an order of magnitude smaller than elliptical galaxies with similar luminosity. This suggests that massive submm galaxies consist of multiple starburst regions. Starburst regions in submm galaxies are found to be self-regulated ; i.e.feedback due to supernovae is nearly balanced with the self-gravity of starburst regions. In such systems, how to cease the star formation depends on the large scale gravitational potential by the dark matter halo, rather than the properties of starburst itself. This may be important to cause the colour-magnitude relation of elliptical galaxies.

  • Research Products

    (11 results)

All 2006 2005 2004 2003

All Journal Article (11 results)

  • [Journal Article] Bimodal Growth History and Statistics of Dark Matter Haloes2006

    • Author(s)
      Hitoshi HANAMI
    • Journal Title

      Mon. Not. R. Astron. Soc. (in press)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Submillimetre properties of near-infrared selected galaxies2006

    • Author(s)
      Toshinobu TAKAGI et al.
    • Journal Title

      Mon. Not. R. Astron. Soc. (in press)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Deep Extragalactic Surveys around Ecliptic Poles with AKARI(ASTRO-F)2006

    • Author(s)
      Hideo MATSUHARA, et al.
    • Journal Title

      Publ. Astro. Soc. Japan 58(In press)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Bimodal Growth History and Statistics of Dark Matter Haloes2006

    • Author(s)
      Hitoshi HANAMI
    • Journal Title

      Mon.Not.R.Astron.Soc. (In press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Submillimetre properties of near-infrared selected galaxies2006

    • Author(s)
      Toshinobu TAKAGI et al.
    • Journal Title

      Mon.Not.R.Astron.Soc. (In press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Deep Extragalactic Surveys around Ecliptic Poles with AKARI (ASTRO-F)2006

    • Author(s)
      Hideo Matsuhara
    • Journal Title

      Publ.Astro.Soc.Japan 58(in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Unveiling the Dusty Cocoon of High-z Starbursts as the Progenitors of Present-Day Ellipticals2005

    • Author(s)
      Hitoshi HANAMI
    • Journal Title

      Astronomical Society of the Pacific Conference Series, "The Cool Universe : Observing Cosmic Dawn" 344

      Pages: 85-89

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Present-day Scaling Relations for Submillmetre Galaxies : the Origin of Spheroidal Systems2004

    • Author(s)
      Toshinobu TAKAGI, Hitoshi HANAMI, Nobuo ARIMOTO
    • Journal Title

      Mon. Not. R. Astron. Soc. 355

      Pages: 424

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] resent-day Scaling Relations for Submillmetre Galaxies ; the Origin of Spheroidal Systems2004

    • Author(s)
      Toshinobu TAKAGI, Hitoshi HANAMI, Nobuo ARIMOTO
    • Journal Title

      Mon.Not.R.Astron.Soc. 355

      Pages: 424

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evolutionary Spectral Energy Distribution Diagnostics of Starburst Galaxies : Signature of Bimodality2004

    • Author(s)
      Toshinobu TAKAGI, Nobuo ARIMOTO, Hitoshi HANAMI
    • Journal Title

      Mon.Not.R.Astron.Soc. 340

      Pages: 813

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evolutionary Spectral Energy Distribution Diagnostics of Starburst Galaxies : Signature of Bimodality2003

    • Author(s)
      Toshinobu TAKAGI, Nobuo ARIMOTO, Hitoshi HANAMI
    • Journal Title

      Mon. Not. R. Astron. Soc. 340

      Pages: 813

    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2007-12-13  

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