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Properties of Dwarf Galaxies in Different Cluster Environments

Research Project

Project/Area Number 09640312
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

OKAMURA Sadanori  The University of Tokyo, Graduate School of Science : Professor, 大学院・理学系研究科, 教授 (20114423)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsDwarf Galaxies / Cluster of Galaxies / Cluster Environment / スペース観測
Research Abstract

We obtained spectra of about 500 dwarf galaxies in the Coma cluster in April 1998 using the 4.2-m William Hcrschel Telescope (WHT) at La Palma. In May 1998, we brought our mosaic CCD camera into WHT and obtained imaging data of Coma, Virgo, and Hercules clusters at the prime focus of WHT.
First data analysis was made for Coma cluster, and the results were compared with Virgo cluster. Coma cluster is a rich regular cluster containing few spiral galaxies while Virgo cluster is a poor irregular and spiral-rich cluster.
The comparison revealed the following. First, dwarf galaxies in Coma cluster shows the exponential radial luminosity profile, which is the same characteristic found in Virgo dwarf galaxies. Second, Coma dwarf galaxies follow the same luminosity versus surface brightness relation found for Virgo dwarf galaxies. These two findings indicate that dwarf galaxies in two very different cluster environments show similar properties. There are two alternative models about the formation of dwarf galaxies. Properties of dwarf galaxies are mostly determined at the time of their formation according to the one model while their properties are largely modified by the galaxy-galaxy and/or galaxy-intergalactic medium interactions in the cluster according to the other. Our findings support the former.
We have found that dwarf galaxies show the color-magnitude relation similar to giant galaxies and that the slope of the relation depends upon the aperture size.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] Y.Komiyama, S.Okamura et al.: "Coma Dwarf Galaxies Resemble Virgo Dwarf Ellipticals" poster paper presented at JD2 「Dwarf Galaxies : Probes for Galaxy Formation and Evolution」 at IAU 23rd GA in Kyoto, Aug.17-30, 1997.(1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Komiyama, S.Okamura et al.: "Properties of Dwarf Galaxy Population in the Coma Cluster" Untangling Coma Berenices : A New Vision of an Old Cluster. 119-122 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Okamura et al.: "Multi-Color Imaging of Clusters of Galaxies with Mosaic CCD Cameras" IAU Symp.179. 287-290 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Yagi, S.Okamura et al.: "Type-Specific Luminosity Functions of Nearby Clusters of Galaxies" IAU Symp.183. 147-147 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Okamura et al.: "Color of Dwarf Galaxies in the Coma Cluster" IAU Symp.183. 104-104 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Kashikawa, S.Okamura et al.: "The Morphology Dependence of Luminosity Segregation in the Coma Cluster" The Astrophysical Journal. 500. 750-762 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Okamura et al.: "Retrieving Bulge and Disk Parameters and Asymptotic Magnitudes from the Growth Curves of Galaxies" Publ.Astron.Soc.Pacific. 111. 31-44 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Komiyama, Y., Okamura, S.et al.: "Coma Dwarf Galaxies Resemble Virgo Dwarf Ellipticals." Poster presented at JD2, Dwarf Galaxies : Probes for Galaxy Formation and Evolution, at IAU 23rd GA at Kyoto. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Komiyama, Y., Okamura, S.et al.: "Properties of Dwarf Galaxy Population in the Coma Cluster." Untangling Coma Berenices : A New Vision of an Old Cluster. 119-122 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Okamura, S.et al.: "Multi-Color Imaging of Clusters of Galaxies with Mosaic CCD Cameras" IAU Symp.179. 287-290 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yagi, M., Okamura, S.et al.: "Type-Specific Luminosity Functions of Nearby Clusters of Galaxies." IAU Symp.183. 147-147 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Okamura, S.et al.: "Color of Dwarf Galaxies in the Coma Cluster." IAU Symp.183. 104-104 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kashikawa, N., Okamura, S.et al.: "The Morphology Dependence of Luminosity Segregation in the Coma Cluster." Astrophys.J.500. 750-762 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Okamura, S.et al.: "Retrieving Bulge and Disk Parameters and Asymptotic Magnitudes from the Growth Curves of Galaxies." Publ.Astron.Soc.Pacific. 111. 31-44 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Kashikawa,S.Okamura et al.: "The Morphology Dependence of Luminosity Segregation in the Coma Cluster" The Astrophysical Journal. 500. 750-762 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] W.Kawasaki,S.Okamura et al.: "An Objective and Automatic Cluster Finder:An Improvement of the Matched-Filter Method" Astronomy & Astrophys.Suppl.130. 567-579 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Okamura et al.: "Retrieving Bulge and Disk Parameters and Asymptotic Magnitudes from the Growth Curves of Galaxies" Publ.Astron.Soc.Pacific. 111. 31-44 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Komiyama,S.Okamura et al.: "Properties of Dwarf Galaxy Population in the Coma Cluster" Untangling Coma Berenices:A New Vision of an Old Cluster. 119-122 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Okamura et al.: "Color of Dwarf Galaxies in the Coma Cluster" IAU Symp.183. 104-104 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Komiyama,S.Okamura et al.: "Coma Dwarf Galaxies Resemble Virgo Dwarf Ellipticals" poster paper presented at JD2 「Dwarf Galaxies:Probes for Galaxy Formation and Evolution」 at IAU 23rd GA in Kyoto,Aug.17-30,1997.(1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Komiyama,Y., Okamura,S., et.al: "Properties of Dwarf Galaxy Population in the Coma Cluster" A New Vision of an Old Cluster : Untangling Coma Berenis. June17-20(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yasuda,N., Okamura,S.et.al: "Study of the Virgo Cluster using the B-Band Tully-Fisher Relation" Ap.J.Suppl.108. 417-448 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Okamura,S., et.al: "Multi-Color Imaging of Clusters of Galaxies with Mosaic CCD Gameras" New Horizons from Multi-Wavelength Sky Surveys Proc.IAU Symp.179. 287-290 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Okamura,S.: "Cosmological Parameters and Evolution of Galaxies : An Observational Perspective" Proc.The 11th Nishinomiya-Yukawa Memorial Symposium on Physics in the 21th Century,eds.K.Kikkawa et.al.(Singaporc: World Scientific). 1997. (155-178)

    • Related Report
      1997 Annual Research Report
  • [Publications] Komiyama,Y., Okamura,S., et.al.: "Coma Dwarf Galaxies Resemble Virgo Dwarf Ellipticals" poster paper presented at JD2 at IAU 23rd GA in Kyoto. Aug.17-30(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kashikawa,N., Okamura,S., et.al.: "The Morphology Dependence of Luminosity Segregation in the Coma Cluster" Ap.J.(in press).

    • Related Report
      1997 Annual Research Report
  • [Publications] Okamura,S., et.al: "IAU Symp." Color of Dwarf Galaxies in the Coma Cluster, (183)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yagi,M., Okamura,S.et.al.: "IAU Symp." Type-Specific Luminosity Functions of Nearby Clusters of Galaxies(in press), (183)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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