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Study of 3-D structure of Orion-Monoceros Molecular Cloud complex with high-precision VLBI

Research Project

Project/Area Number 16540224
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionNation Astronomical Observatory of Japan

Principal Investigator

HIROTA Tomoya  Nation Astronomical Observatory of Japan, Division of Radio Astronomy, Research Fellow, 電波研究部, 上級研究員 (10325764)

Co-Investigator(Kenkyū-buntansha) KOBAYASHI Hideyuki  National Astronomical Observatory of Japan, Division of Radio Astronomy, Professor, 電波研究部, 教授 (20211906)
KAMEYA Osamu  National Astronomical Observatory of Japan, Division of Radio Astronomy, Assistant Professor, 電波研究部, 主任研究員 (70202025)
IMAI Hiroshi  Kagoshima University, Faculty of Science, Research Associate, 理学部, 助手 (70374155)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsRadio Astronomy / VLBI / Star Formation / Molecular Cloud / Protostar / Water Maser / Astrometry / Galactic Astronomy / 原始 / 相対VLBI
Research Abstract

VERA is a newly constructed VLBI array promoted by National Astronomical Observatory of Japan in collaboration with Kagoshima University. VERA aims to measure the annual parallaxes of maser sources associated with star-forming regions and Mira valuables in the Galaxy with an accuracy of 10 micro arcseconds. In this project, we plan to measure the distance and 3-dimensional structure of Orion-Monoceros Molecular Cloud complex, which is the nearest high-mass star-forming region, with VERA.
At first, we performed a survey of 20 H2O maser sources in Orion-Moniceros Molecular Cloud complex and confirmed that 4 sources were detectable with VERA. Based on this result, we started multi-epoch VLBI monitoring observations of these 4 H2O maser sources ; Orion KL, HH1, OMC-2, and Mon R2. Using the VERA dual-beam receiving system, we performed phase-referencing VLBI and successfully measured absolute proper motion of H2O maser features with respect to the nearby extragalactic radio sources. We detected the annual parallax of Orion KL, 2.3 milli arcseconds, corresponding to the distance of 430 pc from the Sun. This value is consistent with that reported by Genzel et al. (1980), 480 +/- 80 pc, which is determined from the proper motion and radial velocity of the maser features. For other sources, we have not yet obtained annual parallax because the life time of H2O maser features were typically as short as 4-6 months. Therefore, we continue monitoring observations of these sources with VERA.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (12 results)

All 2005 2004

All Journal Article (12 results)

  • [Journal Article] Multi-Epoch VERA Observations of oh43.8-0.12005

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

      Publications of the Astronomical Society of Japan 57

      Pages: 595-603

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Parallax Measurements of the Mira-Type Star UX Cygni with Phase-referencing VLBI2005

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

      Astrophysical Journal 627

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] VLBA Observations of a Bursting Water Maser in Orion KL2005

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

      Astrophysical Journal 634

      Pages: 459-467

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] VERA Observation of the W49N H_2O Maser Outburst in 2003 October2004

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

      Publications of the Astronomical Society of Japan 56

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] First mm-VLBI Observations between the TRAO 14-m and the NRO 45-m telescopes : Observations of 86 GHz SiO Masers in VY Canis Majoris2004

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

      Publications of the Astronomical Society of Japan 56

      Pages: 475-480

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The kinematics of water masers in the stellar molecular outfolw source, IRAS 19134+21312004

    • Author(s)
      Imai, H. et al.
    • Journal Title

      Astronomy and Astrophysics 420

      Pages: 265-271

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] VERA Observation of the W49N H2O Maser Outburst in 2003 October2004

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

      Publications of the Astronomical Society of Japan 56

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] First mm-VLBI Observations between the TRAO 14-m and the NRO 45-m Telescopes : Observations of 86 GHz SiO Masers in VY Canis Majoris2004

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

      Publications of the Astronomical Society of Japan 56

      Pages: 475-480

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The kinematics of water masers in the stellar molecular outflow source, IRAS 19134+21312004

    • Author(s)
      Imai, H. et al.
    • Journal Title

      Astronomy and Astrophysics 420

      Pages: 265-271

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] VERA Observation of the W49N H_2O Maser Outburst in 2003 October2004

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

      Publications of the Astronomical Society of Japan Vol.56

    • Related Report
      2004 Annual Research Report
  • [Journal Article] First mm-VLBI Observations between the TRAO 14-m and the NRO 45-m Telescopes : Observations of 86 GHz SiO Masers in VY Canis Majoris2004

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

      Publications of the Astronomical Society of Japan Vol.56

      Pages: 475-480

    • Related Report
      2004 Annual Research Report
  • [Journal Article] The kinematics of water masers in the stellar molecular outflow source, IRAS 19134+21312004

    • Author(s)
      Imai, H. et al.
    • Journal Title

      Astronomy and Astrophysics v.420

      Pages: 265-271

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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