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an observational research on physical conditions of molecular gas in the spiral arms and inter arms of the Galaxy

Research Project

Project/Area Number 18540232
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

HANDA Toshihiro  The University of Tokyo, Graduate School of Science, Assistant Professor (40202270)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordsradio astronomy / molecular cloud / galactic plane survey / the Galactic center
Research Abstract

The 60-cm radio telescope at Nobeyama, which is operated as collaboration between NAOJ and the University of Tokyo, was up-grated by replacement of the receiver before starting this research. Using this telescope we made a galactic plane survey in the CO (2-1) line and got more sensitive data over larger coverage with denser sampling than published before(Sakamoto, et al. 1995). The data at b=0, which were observed in the first season, we finished the data analysis and found the several results on the molecular gas in the Galactic disk region as follows. We found the line intensity ratio of CO (2-1) to CO(1-0) decreases in the R<4kpc region, to which the previous study cannot access. This decease is opposite trend in the R>6kpc region. Using the subsamples divided by the volume emissivity or the line intensity ratio itself from our survey data we found the different radial trend of the line ratio. In both criteria the subsample which are expected in the spiral arm show less difference along the galacto-centric radius. The radial difference of the line ratio is mainly attributed to the interarm gas. These discoveries will be published soon.
We also made observations of the Galactic center region in the NH_3 lines with the 6-m radio telescope at Kagoshima. We observed three metastable lines, those are the NH_3 (1, 1), (2, 2), and (3, 3) lines. The data in the (1, 1) and (2, 2) lines show that the molecular gas temperature in the Central Molecular Zone is higher than the dust temperature over the whole CMZ. We have finished the data analysis for the all three lines and the new results will be published soon.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (10 results)

All 2008 2007 Other

All Journal Article (5 results) (of which Peer Reviewed: 2 results) Presentation (5 results)

  • [Journal Article] The new 60cm radio survey telescope with the sideband-separating SIS receiver for 200GHz band2007

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

      Publication of Astronomical Society of Japan 59

      Pages: 1005-1016

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A complete survey of the central molecular zone in NH_32007

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

      Publication of Astronomical Society of Japan 59

      Pages: 869-887

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] The new 6.0cm radio survey telescope with the sideband-separating SIS receiver for 200GHz band2007

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

      Publication of Astronomical Society of Japan 59

      Pages: 1005-1016

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] The new 60cm radio survey telescope with the sideband-separating SIS receiver for 200GHz band

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

      Publication of Astronomical Society of Japan (submitted)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A complete survey of the central molecular zone in NH_3

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

      Publication of Astronomical Society of Japan (in press)

    • Related Report
      2006 Annual Research Report
  • [Presentation] A New Galactic Plane Survey in CO (J=2-1) with the 60cm Telescope2008

    • Author(s)
      半田、依田、ほか
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      オリンピック記念青少年総合センター
    • Year and Date
      2008-03-25
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A New Galactic Plane Survey in CO(J=2-1) with the 60cm Telescope2008

    • Author(s)
      Yoda T., Handa T., et. al.
    • Organizer
      Annual meeting of the Astron. Soc. Japan in spring
    • Place of Presentation
      National Olympics memorial youth center
    • Year and Date
      2008-03-25
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A New Galactic Plane Survey in CO (J=2-1) with the 60cm Telescope2008

    • Author(s)
      依田、半田、ほか
    • Organizer
      日本天文学会春季年会
    • Place of Presentation
      オリンピック記念青少年総合センター
    • Year and Date
      2008-03-25
    • Related Report
      2007 Annual Research Report
  • [Presentation] 60cmサーベイ望遠鏡によるCO(2-1)輝線銀河系大規模サーベイ計画2007

    • Author(s)
      半田、依田、ほか
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      岐阜大学
    • Year and Date
      2007-09-26
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] A large survey project of the Galaxy in CO(2-1) line with the 60cm telescope2007

    • Author(s)
      Handa T., Yoda T., et. al.
    • Organizer
      Annual meeting of the Astron. Soc. Japan in autumn
    • Place of Presentation
      Gifu University
    • Year and Date
      2007-09-26
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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