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Age Determination of Elliptical Galaxies using H γ Profile

Research Project

Project/Area Number 13640230
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionNational Astronomical Observatory

Principal Investigator

ARIMOTO Nobuo  National Astronomical Observatory, Optical and Infrared Astronomy Division, Professor, 光赤外研究部, 教授 (60242096)

Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsElliptical Galaxies / Galaxy Formation / Galaxy Evolution / Age of Galaxies / Chemical Abundance of Galaxies / 銀河道化 / 星の種族 / 星の生成史 / 銀河の化学進化 / 恒星スペクトル / 星の種族構造
Research Abstract

This research aimed to reveal the formation epoch of elliptical galaxies by measuring their spectroscopic ages. We have taken spectra of 27 elliptical galaxies (13 in the field and group of galaxies and 14 in the Virgo cluster of galaxies) of extremely high quality with Subaru (NAOJ), WTT(Spain, UK) and NTT(ESO) telescopes and have measured their ages and chemical abundances by using the Hg profile method, which we have developed by ourselves. The Hg profile method is a quite efficient approach to disentangle age and metallicity effects in galaxy spectra and has been appreciated a lot since it was proposed by Vazdekis & Arimoto (1999). This study is the first one that applies the Hg profile method to a significantly large number of galaxy samples. In this study, we have made it clear how the ages and metallicities of elliptical galaxies depend on galaxy mass, luminosity, and the environment. The spatial distribution of age and metallicity within a galaxy has also been studied. Our resu … More lts show that 1)massive elliptical galaxies in cluster environment are uniformly old (<10 Gyrs), while those in the field show a scatter in ages spanning from 6 Gyrs to 10 Gyrs old. This indicates that some of filed ellipticals had experienced long lasting star formation until rather recently. 2)Dwarf elliptical galaxies show wide scatter in their ages, from 3 Gyrs to 10 Gyrs old, independent of where they locate. This suggests a rather complicated history of star formation in contrast to what has been thought previously. 3)Mg/Fe ratio of elliptical galaxies shows strong correlation with galaxy mass,; ie., moremassive galaxies tend to have smaller Mg/Fe ratio, suggesting shorter star formation period in more massive elliptical galaxies. 4) In a dwarf elliptical M32 (a companion galaxy of M31 spiral galaxy), the stellar age decreases towards galaxy centre and Mg/Fe ratio too. This is a strong evidence for a long lasting star formation at the galaxy center due to perhaps dissipative gas infall.
In summary we could say that although it is true that formation of elliptical galaxies shows wide variety (in particular among dwarf ellipticals) more massive galaxies formed earlier in the dense cluster environment. Less

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (32 results)

All 2005 2004 2003 2002 Other

All Journal Article (28 results) Publications (4 results)

  • [Journal Article] Stellar Populations of Elliptical Galaxies in Virgo Cluster I. : The Data and Stellar Popylation Analysis2005

    • Author(s)
      Yamada, Y., Arimoto, N.et al.
    • Journal Title

      Astrophysical Journal (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Stellar Populations of Elliptical Galaxies in Virgo Cluster II. : Star Formation History and Scaling Relations2005

    • Author(s)
      Yamada, Y., Arimoto, N.et al.
    • Journal Title

      Astrophysical Journal (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Stellar Populations of Elliptical Galaxies in Low Density Environment2005

    • Author(s)
      Yamada, Y., Arimoto, N.et al.
    • Journal Title

      Astrophysical Journal (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Radial Age and Metal Abundance Gradients in the Stellar Content of M322005

    • Author(s)
      Rose, J.A., Arimoto, N.et al.
    • Journal Title

      Astronomical Journal 129

      Pages: 712-728

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Radial Age and Metal Abundance Gradients in the Stellar Content of M322005

    • Author(s)
      Rose, J.A., Arimoto, N.et al.
    • Journal Title

      AJ 129

      Pages: 712-728

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Subaru/HDS Abundances in Three Giant Stars in the Ursa Minor Dwarf Spheroidal Galaxy2004

    • Author(s)
      Sadakane, K., Arimoto, N.et al.
    • Journal Title

      Publication of the Astronomical Society of Japan 56

      Pages: 1041-1057

    • NAID

      40006568505

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Present-day scaling relations for submillimetre galaxies : the origin of spheroidal systems2004

    • Author(s)
      Takagi, T., Arimoto, N.et al.
    • Journal Title

      Monthly Notices of Royal Astronomical Society 355

      Pages: 424-443

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] The Full-fledged Dwarf Irregular Galaxy Leo A2004

    • Author(s)
      Vansevicius, V., Arimoto, N.et al.
    • Journal Title

      Astrophysical journal 611

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] New Photometric Data of Old Open Clusters in the Anti-Galactic Center Region2004

    • Author(s)
      Hasegawa, T., Arimoto, N.et al.
    • Journal Title

      Publication of the Astronomical Society of Japan 56

      Pages: 295-311

    • NAID

      10023930651

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Subaru/HDS Abundances in Three Giant Stars in the Ursa Minor Dwarf Spheroidal Galaxy2004

    • Author(s)
      Sadakane, K., Arimoto, N.et al.
    • Journal Title

      PASJ 56

      Pages: 1041-1057

    • NAID

      40006568505

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Present-day scaling relations for submillimetre galaxies : the origin of spheroidal systems2004

    • Author(s)
      Takagi, T., Hamani, H., Arimoto, N.et al.
    • Journal Title

      MNRAS 355

      Pages: 424-443

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] The Full-fledged Dwarf Irregular Galaxy Leo A2004

    • Author(s)
      Vansevicius, V., Arimoto, N.et al.
    • Journal Title

      ApJL 611

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] New Photometric Data of Old Open Clusters in the Anti-Galactic Center Region2004

    • Author(s)
      Hasegawa, T., Arimoto, N.et al.
    • Journal Title

      PASJ 56

      Pages: 295-311

    • NAID

      10023930651

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Sixteen-Color Photometry of Galaxy Cluster Abell 5662003

    • Author(s)
      Zhou, X., Arimoto, N.et al.
    • Journal Title

      Publication of the Astronomical Society of Japan 55

      Pages: 891-899

    • NAID

      10023928532

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Discovery of Latent Star Formation in the Extended H I Gas around the Local Group Dwarf Irregular Galaxy NGC 68222003

    • Author(s)
      Komiyama, Y., Arimoto, N.et al.
    • Journal Title

      Astrophysical Journal Letter 590

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Evolutionary spectral energy distribution diagnostics of starburst galaxies : signature of bimodality2003

    • Author(s)
      Takagi, T., Arimoto, N.et al.
    • Journal Title

      Monthly Notices of Royal Astronomical Society 340

      Pages: 813-831

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Star formation histories of local group dwarf galaxies2003

    • Author(s)
      Ikuta, C., Arimoto, N.
    • Journal Title

      Astrophysics & Space Science 284

      Pages: 589-594

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Sixteen-Color Photometry of Galaxy Cluster Abell 5662003

    • Author(s)
      Zhou, X., Arimoto, N.et al.
    • Journal Title

      PASJ 55

      Pages: 891-899

    • NAID

      10023928532

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Discovery of Latent Star Formation in the Extended H I Gas around the Local Group Dwarf Irregular Galaxy NGC 68222003

    • Author(s)
      Komiyama, Y., Arimoto, N.et al.
    • Journal Title

      ApJL 590

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Evolutionary spectral energy distribution diagnostics of starburst galaxies : signature of bimodality2003

    • Author(s)
      Takagi, T., Arimoto, N., Hanami, H.
    • Journal Title

      MNRAS 340

      Pages: 813-831

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Star formation histories of local group dwarf galaxies2003

    • Author(s)
      Ikuta, C., Arimoto, N.
    • Journal Title

      Ap & SS 284

      Pages: 589-594

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] HIPPARCOS age-metallicity relation of the solar neighbourhood disc stars2002

    • Author(s)
      Ibukiyama, A., Arimoto, N.
    • Journal Title

      Astronomy & Astrophysics 394

      Pages: 927-941

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Extended star formation in dwarf spheroidal galaxies : The cases of Draco, Sextans, and Ursa Minor2002

    • Author(s)
      Ikuta, C., Arimoto, N.
    • Journal Title

      Astronomy & Astrophysics 391

      Pages: 55-65

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] HIPPARCOS age-metallicity relation of the solar neighbourhood disc stars2002

    • Author(s)
      Ibukiyama, A., Arimoto, N.
    • Journal Title

      A & A 394

      Pages: 927-941

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Extended star formation in dwarf spheroidal galaxies : The cases of Draco, Sextans, and Ursa Minor2002

    • Author(s)
      Ikuta, C., Arimoto, N.
    • Journal Title

      A & A 391

      Pages: 55-65

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Stellar Populations of Elliptical Galaxies in Virgo Cluster I. : The Data and Stellar Population Analysis

    • Author(s)
      Yamada, Y., Arimoto, N.et al.
    • Journal Title

      ApJ (in printing)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Stellar Populations of Elliptical Galaxies in Virgo Cluster II. : Star Formation History and Scaling Relations

    • Author(s)
      Yamada, Y., Arimoto, N.et al.
    • Journal Title

      ApJ (in printing)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Stellar Populations of Elliptical Galaxies in Low Density Environment

    • Author(s)
      Yamada, Y., Arimoto, N.et al.
    • Journal Title

      ApJ (in printing)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 有本信雄他: "Spectroscopic Ages of Elliptical Galaxies -Subaru Observation"Multiwavelength Mapping of Galaxy Formation and Evolution. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 山田善彦, 有本信雄他: "Spectroscopic Age and Metallicity of Elliptical Galaxies"Stellar Populations 2003 Proceedings (Web). (公開中).

    • Related Report
      2003 Annual Research Report
  • [Publications] 有本信雄他: "Submm Galaxies -Star Forming Proto-Ellipticals at z>2?"Stellar Populations 2003 Proceeding (Web). (公開中).

    • Related Report
      2003 Annual Research Report
  • [Publications] A.Vazdekis, N.Arimoto, etc: "47 Tucanae : the Spectroscopic versus CMD Age Discrepancy"IAU Symp.Ser."Extragalactic Star Clusters". 207(印刷中). (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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