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2001 Fiscal Year Final Research Report Summary

A Study of the Galactic Structure by a Survey of the Southern Milky Way with a Wide-Field Telescope

Research Project

Project/Area Number 09044058
Research Category

Grant-in-Aid for Scientific Research (A).

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionUniversity of Tokyo

Principal Investigator

HASEGAWA Tetsuo  The University of Tokyo, School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (50134630)

Co-Investigator(Kenkyū-buntansha) HAYASHI Masahiko  National Astronomical Observatory of Japan, Division of Optical and Infrared Astronomy, 光学赤外線天文学研究系, 教授 (10183914)
HANDA Toshihiro  The University of Tokyo, School of Science, Assistant Professor, 大学院・理学系研究科, 助手 (40202270)
Project Period (FY) 1997 – 1999
Keywordsstar formation / interstellar matter / the galaxy / Magellanic clouds / millimeter / submillimeter waves / radio astronomy / survey / Chile
Research Abstract

We have made a survey of the CO J=2-1 emission from the southern Milky Way and the Large Magellanic Cloud with the dedicated 60-cm survey telescope. A complete L-V map was made for the CO J=2-1/J=1-0 intensity ratio in the inner Galaxy. The Galactic disk exhibits a ratio of 0.3-1.0, with the mean value gradually declining with the galactocentric distance. A high quality data were taken for the Galactic center region. Our analysis revealed that the molecular gas in the central 200 pc of the Galactic center has the pressure an order of magnitude higher than that in the Galactic disk. A method was developed to re-construct a face-on map of the molecular gas in the Galactic center region. It relies on quantitative comparison between the CO emission and OH absorption lines, and is independent from the kinematical models. The face-on map shows a molecular bar with a size of 500 pc by 200 pc. The molecular gas in the Large Magellanic Cloud shows the ratio somewhat higher than that in the Galactic disk. The complex of molecular clouds south of 30 Dor appears to contain a large amount of dense gas without ongoing massive star formation.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Sawada et al.: "The Tokyo-Onsala-ESO-Calan Galactic CO J=2-1 Survey. I. The Galactic Center Region"Astrophys. J. Suppl.. 136. 189-219 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Sorai et al.: "The CO J=2-1/J=1-0 Ratio in the Large Magellanic Cloud"Astrophys. J.. 551. 794-802 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Oka et al.: "A Large-Scale CO Survey of the Galactic Center"Astrophys. J. Suppl.. 118. 455-515 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Seta et al.: "Enhanced CO J=2-1/J=1-0 Ratio as a Marker of Supernova Remnant-Molecular Cloud Interactions : The Case of W44 and IC 443"Astrophys. J.. 505. 286-298 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Oka et al.: "CO (J=2-1) Line Observations of the Galactic Center Molecular Cloud Complex. II. Dynamical Structure and Physical Conditions"Astrophys. J.. 493. 730-761 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Sakamoto et al.: "An Out-of Plane CO (J=2-1) Survey of the Milky Way. II. Physical Conditions of Molecular Gas"Astrophys. J.. 486. 276-290 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sawada et al.: "The Tokyo-Onsala-ESO-Calan Galactic CO J=2-1 Survey. I. The Galactic Center Region"Astrophys. J. Suppl.. 136. 189-219 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Sorai et al.: "The CO J=2-1/J=1-0 Ratio in the Large Magellanic Cloud"Astrophys. J.. 551. 794-802 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Oka et al.: "A Large-Scale CO Survey of the Galactic Center"Astrophys. J. Suppl.. 118. 455-515 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Seta et al.: "Enhanced CO J=2-1/J=1-0 Ratio as a Marker of Supernova Remnant-Molecular Cloud Interactions: The Case of W44 and IC443"Astrophys. J.. 505. 286-298 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Oka et al.: "CO (J=2-1) Line Observations of the Galactic Center Molecular Cloud Complex II. Dynamical Structure and Physical Conditions"Astrophys. J.. 493. 730-761 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Sakamoto et al.: "An Out-of-Plane CO (J=2-1) Survey of the Milky Way. II. Physical Conditions of Molecular Gas"Astrophys. J.. 486. 276-290 (1997)

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

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Published: 2003-09-17  

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