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1994 Fiscal Year Final Research Report Summary

Unbiased surveys for dense cloud cores using multi-beam supercondutcing receiver

Research Project

Project/Area Number 05402003
Research Category

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

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionNagoya University

Principal Investigator

FUKUI Yasuo  Nagoya University, Department of Science, Professor, 理学部, 教授 (30135298)

Co-Investigator(Kenkyū-buntansha) MIZUNO Akira  Nagoya University, Department of Science, Assistant Professor, 理学部, 助手 (80212231)
OGAWA Hideo  Nagoya University, Department of Science, Associate Professor, 理学部, 助教授 (20022717)
Project Period (FY) 1993 – 1994
KeywordsRadio Astronomy / Star Formation / Millimeter Wave Derectors / Molecular Cloud Cores / Molecular Spectra
Research Abstract

We have carried out a large-scale survey with two 4 meter millimeter-wave telescopes, and obtained about 300,000 spectra of ^<13>CO (J=1-0) emission toward the Cygnus, Cassiopeia, Ophiuchus, Serpens and Taurus regions. The observed area corresponds to 15% of the whole sky, which makes this survey the most extensive one among those made in ^<13>CO.We have identified more than 1,000 ^<13>CO clouds and analyzed the physical paramerers of these clouds. Comparing with the IRAS point sources, we have examined the star formation activity of each cloud and the relationship between the characteristics of newly-born stars and those of clouds. This is the first time to analyze characteristics of clouds based on such a uniform spectral data. As a result, following two points are found :
(1) The mass spectrum of clouds is expressed as a power-law with the index-1.7 in the range 100-10,000 M_<<of sun>>.
(2) There is a relationship between the luminosity of the most luminous star within each cloud and the mass of the cloud ; i.e., the maximum stellar luminosity increases with the cloud mass.
We have also found the following three points through the detailed ^<13>CO observations toward Taurus region ; (1) the basic structure of the Taurus cloud is filamentary, (2) star formation has taken place where the column density reaches its highest and (3) soon after the formation occurs, high-density molecular gas disappears. We have studied the dense regions of clouds in detail by observations of C^<18>O,which is more transparent than ^<13>CO,and found that above relations (2) and (3) are more significant than in ^<13>CO.These results are valuable knowledge in order to understand the star formation within molecular gas.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Y.Fukui: "Molecular outflows" Protostars and Planets III. 603-639 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Abergel: "Comparative analysis of the far IR emission and the ^<13>CO emission of the Taurus complex" Astrophys.J.(Letters). 423. L59-L62 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Mizuno: "Molecular condensation as a tracer of low-mass star formation" Nature. 368. 719-721 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] F.Sato: "A new look at the dark cloud L1251 : sensitive observations of the molecular emission" Astrophys.J.435. 279-289 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Dobashi: "Molecular clouds in Cygnus.I.A large scale ^<13>CO survey" Astrophys.J.Suppl.95. 419-456 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福井康雄: "星の誕生から宇宙の暗黒物質へ" 科学. 3月. 177-186 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Fukui, Molecular outflows: Protostars and Planets. III. 603-639 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Abergel, Comparative analysis of the IR emission and the ^<13>CO emission of the Taurus complex: Protostars and Planets. III. 603-639 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Mizuno: "Molecular condention as a tracer of low-mass-star formation" Nature. 368. 719-721 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F.Sato: "A new look at the dark clocuds L1251 : sensitive observation of the molecular emission" Astrophys.J.435. 719-721 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Dobashi: "Molecular clouds in Cygnus. I.A large scale ^<13>CO survey" Astrophys.J.Suppl 95. 419-456 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Fukui: "From star formation to cosmic dark matter" Kagaku. March. 177-186 (1994)

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

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Published: 1999-03-09  

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