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An Observational Study of Galaxy Properties in the Early Universe

Research Project

Project/Area Number 15540228
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

SHIMASAKU Kazuhiro  University of Tokyo, Department of Astronomy, Research Associate, 大学院・理学系研究科, 助手 (00251405)

Co-Investigator(Kenkyū-buntansha) OKAMURA Sadanori  University of Tokyo, Department of Astronomy, Professor, 大学院・理学系研究科, 教授 (20114423)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsgalaxies / large-scale structure of the universe / early universe / galaxy evolution / 遠方宇宙
Research Abstract

How galaxies formed and evolved is one of the fundamental issues in modern astronomy. To address this, issue, it is essential to observe very distant galaxies (i.e., galaxies in very early universes). The purpose of this research is to detect a large number of galaxies at redshift >5 using the 8.2m Subaru Telescope and study the statistical properties (such as luminosity function and spatial clustering) of very distant galaxies. The age of the universe at z=5 is 1.2 Giga years old, which is less than 10% of the current age, 14 Giga years.
We made deep imaging observations in a blank field called ‘'Subaru Deep Field' in a number of bandpasses with a wide-field prime-focus camera on the Subaru Telescope, to select about 2000 galaxies over a redshift range of z=4-6. We found that the number density of bright galaxies increases by an order of magnitude from z=6 to z=4. This implies that we have located the era of the intense formation of massive galaxies. We infer that these bright galaxies are progenitors of galaxies seen in present-day galaxy groups and clusters. We also found in our sample that galaxies are distributed quite inhomogeneously in space, forming large-scale structures. This discovery is important in discussing the formation history of large-scale structure commonly seen in the present-day universe. Finally, we studied the photometric properties of red galaxies at redshift 1-2 using optical and infrared data and discussed their evolution in number density and color.

Report

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

    (17 results)

All 2004 2003 Other

All Journal Article (14 results) Publications (3 results)

  • [Journal Article] Subaru Deep Survey VI. A Census of Lyman Break Galaxies at Z=4 and 5 in the Subaru Deep Fields : Clustering Properties2004

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

      Astrophysical Journal 611

      Pages: 685-702

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Subaru Deep Survey V. A Census of Lyman Break Galaxies at Z=4 and 5 in the Subaru Deep Fields : Clustering Properties2004

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

      Astrophysical Journal 611

      Pages: 660-684

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Large Cosmic Variance in the Clustering Properties of Lyman Alpha Emitters at z=52004

    • Author(s)
      Shimasaku, K. et al.
    • Journal Title

      Astrophysical Journal 605

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Subaru Deep Survey VI. A Census of Lyman Break Galaxies at z=4 and 5 : Clustering Properties2004

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

      Astrophysical Journal 611

      Pages: 685-702

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 : Photometric Properties2004

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

      Astrophysical Journal 611

      Pages: 660-684

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Subaru Deep Survey. VI. A Census of Lyman Break Galaxies at z【similar or equal】4 and 5 in the Subaru Deep Fields : Clustering Properties2004

    • Author(s)
      Ouchi, M.
    • Journal Title

      Astrophysical Journal 611

      Pages: 685-702

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Subaru Deep Survey. V. A Census of Lyman Break Galaxies at z【similar or equal】similar or equal 4 and 5 in the Subaru Deep Fields : Photometric _Properties2004

    • Author(s)
      Ouchi, M.
    • Journal Title

      Astrophysical Journal 611

      Pages: 660-684

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Large Cosmic Variance in the Clustering Properties of Ly α Emitters at z【similar or equal】52004

    • Author(s)
      Shimasaku, K
    • Journal Title

      Astrophysical Journal 605

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Properties of host haloes of Lyman-break galaxies and Lyman α emitters from their number densities and angular clustering2004

    • Author(s)
      Hamana, T.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 347

      Pages: 813-823

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Evolution of Elliptical Galaxies at z>1 Revealed from a Large, Multicolor Sample of Extremely Objects2003

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

      Publications of the Astronomical Society of Japan 55

      Pages: 1079-1103

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Properties of host halos of Lyman-break galaxies and Lyman alpha emitters from their number densities and angular clustering2003

    • Author(s)
      Hamana, T. et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 347

      Pages: 813-823

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evolution of Elliptical Galaxies at z>1 Revealed From a Large, Multicolor Sample of Extremely Red Objects2003

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

      Publications of the Astronomical Society of Japan 55

      Pages: 1079-1103

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Properties of Host Halos of Lyman-break Galaxies and Lyman Alpha Emitters From Their Number Densities And Angular Clustering2003

    • Author(s)
      Hamana, T. et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 347

      Pages: 813-823

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evolution of Elliptical Galaxies at z【greater than or similar】1 Revealed from Large, Multicolor Sample of the Extremely Red Objects2003

    • Author(s)
      Miyazaki, M.
    • Journal Title

      Publications of the Astronomical Society of Japan 55

      Pages: 1079-1103

    • Related Report
      2004 Annual Research Report
  • [Publications] Shimasaku, K., Okamura, S.et al.: "Subaru Deep Survey, IV, Discovery of a Large-Scale Structure at Radshift【similar or equal】5"Astrophysical Journal. 586. L111-L114 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Miyazaki, My Shimasaku, K., Okamura, S. et al.: "Evolution of Elliptical Galaxies at Z【greater than or similar】1 Revealed from a Large, Multicolor Sample of Extremely Red Objects"Publications of the Astronomical Society of Japan. 55. 1079-1103 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hamaya, T., Shimasaku, K.et al.: "Properties of host haloes of Lyman-break Galaxies and Lyman α Emitters from their Number Densities and Angular Clustering"Monthly Notices of the Royal Astronomical Society. 347. 813-823 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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