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A study of star forming regions based on the unbiased survey

Research Project

Project/Area Number 07044075
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionNagoya University

Principal Investigator

FUKUI Yasuo  Department of Astrophysics, Nagoya University, Professor, 大学院・理学研究科, 教授 (30135298)

Co-Investigator(Kenkyū-buntansha) RUBIO M  Chile University, Professor, 理学部, 教授
SEARLE L  Observatories of the Carnegie Institution Director, 主任研究員
OEMLER A.Jr  Observatories of the Carnegie Institution Director, 台長
KUN M  Konkoly Observatory, Astronomer, 研究員
BALAZS L  Konkoly Observatory, Professor, 主任研究員
MIZUNO Akira  Department of Astrophysics, Nagoya University, Assistant Professor, 大学院・理学研究科, 助手 (80212231)
OGAWA Hideo  Department of Astrophysics, Nagoya University, Associate Professor, 大学院・理学研究科, 助教授 (20022717)
OEMLER Jr.A.  カーネギー研究所天文台, 台長
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1996: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 1995: ¥3,300,000 (Direct Cost: ¥3,300,000)
KeywordsRadio astronomy / Star formation / molecular cloud / 星間分子雲
Research Abstract

Studies of star formation have been made mostly as detailed ones for individual star forming regions. This kind of study tends to be done on "famous" star forming regions like Orion KL region. It is however crucially important to ask how the properties derived by such studies are ubiquitous among other regions of star formation. We need to be critical in using these results or extending the conclusions obtained to star forming regions in general. The present study the conclusions obtained to star forming regions in general. The present study aims at understanding the trend of star formation, or the general rule in star formation by carrying out an extensive survey of molecular clouds, star forming regions, with two 4-m radio telscopes equipped with the world-best superconducting receivers developed at Nagoya University. The major conclusions are summarized as follows ;
1. The cloud mass spectrum is wel represented as a power law of an index of -1.7.
2. There is no significant correlation between the cloud mass and the spectral linewidth.
3. The protostars formed in the individual clouds obeys a power law of luminosity with an index of -1.3, as is consistent with previously known Initial Mass Functions of ordinary stars.
4. The maximum stellar luminosity formed in a cloud of a given mass is proportional to the 1.4-th power of the parent cloud mass.
5. Star formation activity is correlated with the ratio of virial mass and LTE mass of a cloud. This trend is naturally understood as indicating that a cloud slowly contracts to for stars through dissipation of the internal turbulent motion.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (41 results)

All Other

All Publications (41 results)

  • [Publications] R.J.Laureijs: "Moderate density regions in the Lynds 134 cloud complex" Astrophys.J.Suppl.101. 87-115 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Abergel: "Far IR and CO (J=1-0) large scale emissions of the Taurus complex" Astrophys.J.Suppl.111. 483-491 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Mizuo: "Overall distribution of dense molecular gas and star formation in the taurus cloud complex" Astrophys.J.445. L161-L165 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Dobashi: "Molecular clouds in Cygnus.II.Statistical studies of star forming regions" Astrophys.J.466. 282-295 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ji Yang: "Interferometric observations of the circumstellar molecular structure around the young stellar object in L1287" Astrophys.J.455. 175-181 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Handa: "Detection of a Cricumstellar Gas around DM Tau ; A Protoplanetary Disk around a Single Star?" Astrophys.J.449. 894-899 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] P.Abraham: "Molecular material and young stellar objects in L1188 : a case for triggered star formation?" Astron.Astrophys.300. 525-533 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Dobashi: "^<12>CO and ^<13>CO observations toward two small molecular clouds with luminous protostellar candidates" PAS Japan. 47. 837-843 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Tachihara: "^<13>CO (J=1-0) observations of the Lupus molecular clouds" PAS Japan. 48. 489-502 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Onishi: "A C^<18>O survey of dense clouds cores in Taurus : core properties" Astrophys.J.465. 815-824 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Z-.Y.Yu: "The new observation of C^<18>O (J=1-0) molecular emission in the Cepheus OB3 molecular cloud" Astrophys.J.471. 867-870 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Yonekura: "Molecular clouds in Cepheus and Cassiopeia" Astrophys.J.Suppl.(in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Nagahama: "A spatially complete ^<13>CO J=1-0 survey of the Orion A cloud" Astron.J.(submitted). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Nagahama: "Observations of dense molecular gas in the Orion A cloud : a comparative study of C^<18>O J=1-0 and CS J=2-1 distributions" Astron.J.(submitted). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] R.J.Laureijs: "Moderate density regions in the Lynds 134 cloud complex" Astrophys.J.Suppl.101. 87-115 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Abergel: "Far IR and CO (J=1-0) large scale emissions of the Taurus complex" Astron.Astrophys.Suppl.111. 483-491 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Mizuno: "Overall distribution of dense molecular gas and star formation in the Taurus cloud complex" Astrophys.J.445. L161-L165 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Dobashi: "Molecular clouds in Cygnus. II.Statistical studies of star forming egions" Astrophys.J.466. 282-295 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ji Yang: "Interferometric observations of the circumstellar molecular structure around the young stellar object in L1287" Astrophys.J.455. 175-181 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Handa: "Detection of a cricumstellar gas around DM Tauri ; a protoplanetary disk around a single star?" Astrophys.J.449. 894-899 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] P.Abraham: "Moderate density regions in the Lynds 134 cloud complex" Astron.Astrophys.300. 525-533 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Dobashi: "^<12>CO and ^<13>CO observations toward two small molecular clouds with luminous protostellar candidates" PAS Japan. 47. 837-843 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Tachihara: "^<13>CO (J=1-0) observations of the Lupus molecular clouds" PAS Japan. 48. 489-502 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Onishi: "AC^<18>O survey of dense clouds cores in Taurus : core properties" Astrophys.J.465. 815-824 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Z-.Y.Yu: "The new observation of C^<18>O (J=1-0) molecular emission in the Cepheus OB3 molecular cloud" Astrophys.J.471. 867-870 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Yonekura: "Molecular clouds in Cepheus and Cassiopeia" Astrophys.J.Suppl.(in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Nagahama: "A spatially complete ^<13>COJ=1-0 survey of the Orion A cloud" Astron.J.(submitted). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Nagahama: "Observations of dense molecular gas in the Orion A cloud : a comparative study of C^<18>OJ=1-0 and CSJ=2-1 distributions" Astron.J.(submitted). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Tachihara: "^<13>CO(J=1-0)observations of the Lupus molecular clouds" PAS Japan. 48. 489-502 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Onishi: "A C^<18>O survey of dense clouds cores in Taurus:core properties" Astrophys.J.465. 815-824 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Z-.Y.Yu: "The new observation of C^<18>O(J=1-0)molecular emission in the Cepheus OB3 molecular cloud" Astrophys.J.471. 867-870 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y.Yonekura: "Molecular clouds in Cepheus and Cassiopeia" Astrophys.J.Suppl.(in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Nagahama: "A spatially complete ^<13>CO J=1-0 survey of the Orion A cloud" Astron.J.(submitted). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Nagahama: "Observations of dense molecular gas in the Orion A cloud:a comparative study of C^<18>O J=1-0 and CS J=2-1 distributions" Astron.J.(submitted). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] R.J.Laureijs: "“Moderate density regions in the Lynds 134-cloud complex"" Astrophys. J. Suppl.101. 87-115 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Handa: "“Detection of a Cricumstellar Gas around DM.Tau ; A Protoplanetary Disk around a Single Star?"" Astrophys. J.449. 894-899 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] A.Mizuno: "“Overall distribution of dense molecular gas and star formation in the taurus cloud complex"" Astrophys. J.445. L161-L165 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] P.Abraham: "“Molecular material and young stellar obijects in L1188 : a case for triggered star formation?"" Astron. Astrophys.300. 525-533 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Dobashi: "“^<12CO> and ^<13>CO observations toward two small molecular clouds with luminous protostellar candidates"" PAS Japan. 47. 837-843 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Ji Yang: "“Interferometric observations of the circumstellar molecular structure around the young stellar object in L1287"" Astrophys. J.455. 175-181 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Dobashi: "“Molecular clouds in Cygnus. II. Statistical studies of star forming regions"" Astrophys. J.(in press). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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