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2002 Fiscal Year Final Research Report Summary

Galaxy Astronomy by Sloan Digital Sky Survey

Research Project

Project/Area Number 12304008
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionTHE UNIVERSITY OF TOKYO

Principal Investigator

SEKIGUCHI Masaki  Institute for Cosmic Ray Research, The University of Tokyo, Associate Professor, 宇宙線研究所, 助教授 (40216528)

Co-Investigator(Kenkyū-buntansha) ICHIKAWA shinnichi  National Astronomical Obsavatory, Data-Center, Associate Professor, データセンター, 助教授 (80211738)
ICHIKAWA Takashi  University of Tohoku, Associate Professor, 理学部, 助教授 (80212992)
FUKUGITA Masataka  Institute for Cosmic Ray Research, The University of Tokyo, Professor, 宇宙線研究所, 教授 (40100820)
OKAMURA Sadanori  School of Science, The University of Tokyo, Professor, 大学院・理学系研究科, 教授 (20114423)
DOI Mamoru  School of Science, The University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (00242090)
Project Period (FY) 2000 – 2002
KeywordsAll Sky Survey / Galaxy Luminosity Function / Gravitationally Lensed QSO / Cluster of Galaxies
Research Abstract

SDSS Project, as a whole, did not have ant major problems, foreseeing the completion of the survey in 2005. We have accomplished the first major public data release (DR1) in the spring of 2003. DR1 makes 15% of the total survey available to all astronomical researchers world wide as well as general public. In the spring of 2003, 60% of imaging and 40% of spectroscopy have completed.
We have found z=6.4 QSO, the most distant QSO known to the date. Its absorption feature in short wavelength region suggests that z=6.0 is the era when the universe changed from non-ionized to ionized. This observational evidence was first reported by this observation.
We continue to find gravitationally lensed QSOs (GL-QSOs). So far, all of them are found by our group using SDSS data. The number of GL-QSO is a few factor smaller than theoretical prediction. This is a very interesting problem need to be studied soon. We also stared to search GL-QSOs that have a large separation and already found several good candidates.
We confirmed that there are two special kinds of galaxies, 1) spiral galaxies without star formation (we named them "passive spiral"), and 2) elliptical galaxies with star formation (E+A galaxies). Our analysis suggests that the passive spiral galaxies stopped forming stars because their gas and dust were stripped and that they later on merged into normal elliptical galaxies. On the other hand, we think, E+A galaxies are isolated from clusters and do not contribute to the cluster evolution.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] D.Eisenstein et al.: "Average Spectra of Massive Galaxies in the Sloan Digital Sky Survey"Astrophysical Journal. 585. 694 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] I.Csabai, et al.: "The Application of Photometric Redshifts to the SDSS Early Data Release"Astronomical Journal. 125. 580 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Goto, S.Okamura, et al.: "Composite Luminosity Functions Based on the Sloan Digital Sky Survey"Cut and Enhance"Galaxy Cluster Catalog"P.A.S.P.. 54. 515 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Strauss et al.: "Spectroscopic Target Selection in the Sloan Digital Sky Survey : The Main Galaxy Sample"Astronomical Journal. 124. 1810 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Bahcall et al.: "The Cluster Mass Function from Early Sloan Digital Sky Survey Data : Cosmological Implications"Astrophysical Journal. 585. 182 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] P.Gomez et al.: "Galaxy Star Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey"Astrophysical Journal. 584. 210 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.Eisenstein et al.: "Average Spectra of Massive Galaxies in Sloan Digital Sky Survey"Astrophysical Journal. 585. 694 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.Csabai et al.: "The Application of Photometric Redshifts to the SDSS Early Data Release"Astrophysical Journal. 125. 580 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Goto, S.Okumura et al.: "Composite Luminosity Functions Based on the Sloan Digital Sky Survey "Cut and Enhance" Galaxy Cluster Catalog"P.A.S.P.. 54. 515 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Strauss et al.: "Spectroscopic Target Selection in the Sloan Digital Sky Survey : The Main Galaxy Sample"Astronomical Journal. 124. 1810 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Bahcall et al.: "The Cluster Mass Function from Early Sloan Digital Sky Survey Data : Cosmological Implicatios"Astrophysical Journal. 585. 182 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] P.G omez et al.: "Galaxy star Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey"Astrophysical Journal. 584. 210 (2003)

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

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Published: 2004-04-14   Modified: 2017-03-24  

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