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A statistical study of star formation by an extensive survey of molecular clouds

Research Project

Project/Area Number 02044064
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionNagoya University

Principal Investigator

FUKUI Yasuo  Department of Physics, Nagoya University Associate Professor, 理学部, 助教授 (30135298)

Co-Investigator(Kenkyū-buntansha) BOOTH R.  European Southern Observatory Director, 台長
RODGERS A.  Australia National University Professor, 教授
SCALISE E. Jr.  Institut de Pesquises Espaciais Senior Research associate, 主任研究員
STROM S.  University of Massachusetts Professor, 教授
TOKUNAGA A.  University of Hawaii Researcher, 研究員
MYERS R.  Harvard-Smithsonian Center for Astrophysics Senior Research Associate, 主任研究員
WINNEWISSER G.  University of Cologne Professor, 教授
OGURA Katsuo  Kokugakuin University Professor, 文学部, 教授 (30102099)
SATO Fumio  Tokyo Gakugei Unieversity Associate Professor, 地学, 助教授 (70154094)
FUJIMOTO Mitsuaki  Department of Physics, Nagoya University Professor, 理学部, 教授 (70022580)
IWATA Takahiro  Communications Research Laboratory Researcher, 研究官
MIZUNO Akira  Department of Physics, Nagoya University Research Associate, 理学部, 助手 (80212231)
OGAWA Hideo  Department of Physics, Nagoya University Research Associate, 理学部, 助手 (20022717)
SUROM S.  マサチューセッツ大学, 教授
ZIMMERMANN P  ケルン大学, 助教授
SCHIEDER R.  ケルン大学, 助教授
WINNEWISSER  ケルン大学, 教授
河鰭 公昭  名古屋大学, 理学部, 教授 (60022513)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥15,000,000 (Direct Cost: ¥15,000,000)
Fiscal Year 1991: ¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 1990: ¥6,500,000 (Direct Cost: ¥6,500,000)
KeywordsRadio astronomy / Star formation / Interstellar molecule / Millimeter astronomy / Interstellar matter
Research Abstract

It is one of the most important subjects of modern astronomy to understand how stars are formed in interstellar space. Considerable efforts have been made toward the understanding of star formation processes. However, most young stars detected so far are optically visible or have high far infrared luminosities. This suggests that the view on star formation we have at present might be significantly biased toward the later stage of star formation and thus toward the massive star formation. We should have an unbiased sample of star formation regions in order to correctly understand star formation, particularly in it earliest stage heavily obscured in molecular clouds. In order to obtain unbiased molecular data of star formation regions, the Nagoya group has been surveying the molecular gas within 1-2 kpc of the sun by using the two 4m radio telescopes. This survey covers an area of a few 100 square degrees and is one of the most extended fully samples arc min in the J=1-0 CO, ^<13>CO and … More C^<18>O spectra at 3 mm. The results are discovery of 60 molecular outflows associated with cold IRAS sources, and numerous dense cloud cores in the J=1-0 C^<18>O and J=2-1 CS spectra. This certainly demonstrates that there are a number of star formation regions veiled from previous studies.
In the present research, on the basis of the observational data with the Nagoya telescopes, we obtained following four results ; 1. discovery of five molecular outflows including one in the southern sky, 2. a detailed study of correlation in intensity between millimeter wave ^<13>CO and far infrared radiation, 3. a study of the correlation length of the velocity field in a dense core, and 4. a study of the large scale distribution of atomic hydrogen around dark cloud complexes. In addition these, we have marked an important step toward an extensive CO survey in the southern sky in the near future by using the instruments in Australia and Chile.
The molecular outflows discovered are located in a dark cloud complex near an HII region IC5146, and near HH132 in the southern sky. Particularly, the IC5146 region was observed for the first time to such an extensive manner in three spectra, CO, ^<13>CO, and C^<18>O, with the Nagoya 4m telescope and with the 14m telescope at University of Massachusetts. This region will provide another good example of active star formation within a dense cloud complex similar to the L1641 cloud. Less

Report

(2 results)
  • 1991 Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (38 results)

All Other

All Publications (38 results)

  • [Publications] A.Mizuno: "A Remarkable multilobe molecular outflow:ρ Ophiuchi East,associated with IRAS 16293-2422" Astrophys.J.356. 184-194 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Fukui: "A comparative study of star formation efficiencies in nearby molecular cloud complexes" IAU Symposium 147 Fragmentation of molecular clouds and star formation. 275-288 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H.Ogawa: "A110 GHz SIS receiver for radio astronomy" Int.J.Infrared and Millimeter Waves. 11. 717-726 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Uchida: "Velocity split along the Rho Ophiuchi streamer (North):spinning streamer as "angular momentum drain" from massive cloud of active star-dormation" Publ.Astron.Soc.Japan. 42. 69-83 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S.Nozawa: "A study of ^<13>CO cloud cores in Ophiuchus" Astrophys J.Suppl.77. 647-675 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Sugitani: "A catalog of bright-rimmed clouds with IRAS point sources:candidates for star formation by radiation-driven implosion.I.Norther hemisphere" submitted to Astrophys J.Suppl.(1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] J.Yang: "A newly discovered molecular cloud in Cep OB4" Astrophys.J.362. 538-544 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] J.Yang: "A millimeter wave lone study of L1287:a case of induced star formation by stellar wind compression?" Astrophys.J.(1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Fukui: "Molecular outflows" in Protostars and Planets III. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] A.Mizuno: "A large scale survey of dense cores and molecular outflows Ophiuchus" IAU Symposium 147,Fragmentation of molecular clouds and star formation. 462-463 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Koyama: "An X-ray pulsar in the direction of molecular cloud MBM 12 (Lynds 1457)" Astrophys.J.277. 240-245 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T.Umemoto: "U-shaped outflow in the L1221 dark cloud:an example of interaction of outflows with ambient clouds" Astrophys.J.377. 510-518 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Fukui: "A new 4m millimeter-wave telescope for a southern sky CO survey" IAU Symposium 148,The Magellanic Clouds. 105-106 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] J.Yang: "A CO study of Sharpless 171;Evidence for interaction between the HII region and its neighboring molecular cloud" Astrophys.J.386. 618-626 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] P.Goldsmith: "Structure,chemistry,and clumping in the NGC2071(North) molecular cloud" Astrophys.J.385. 522-535 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Fukui: "Molecular outflows;observational signature for the earliest phase of stellar evolution" Primitive solar nebula and origin of the planets. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Fukui: "A comparative study of star formation efficiencies in nearby molecular cloud complexes." IAU Symposium 147, Fragmentation of molecular clouds and star formation,. 275-288 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] A. Mizuno: "A large scale survey of dense cores and molecular outflows Ophiuchus." IAU Symposium 147, Fragmentation of molecular clouds and star formation,. 462-463 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] J. Yang: "A CO study of Sharpless 171 ; Evidence for interaction between the HII region and its neighboring molecular cloud." Astrophys. J.386. 618-626 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] P. Goldsmith: "Structure, Chemistry, and clumping in the NGC2071 (North) molecular cloud." Astrophys. J.385. 522-535 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Fukui: "Molecular outflows." Protostars and Planets III, ed. E. Levy. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Fukui: "Molecular outflows ; observational signature for the earliest phase of stellar evolution." Primitive solar nebula and origin of the planets, ed. H. Ohya. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Sugitani: "A catalog of bright-rimmed clouds with IRAS point sources : candidates for star formation by radiation-driven implosion I, northern hemisphere." Astrophys. J. Suppl.77. 59-66 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Koyama: "An X-ray pulsar in the direction of molecular cloud MBM 12 (Lynds 1457)" Astrophys. J.277. 240-245 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] J. Yang: "A millimeter wave line study of L1287 : a case of induced star formation by stellar wind compression?" Astrophys. J.373. 137-145 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. Umemoto: "U-shaped outflow in the L1221 dark cloud : an example of interaction of outflows with ambient clouds." Astrophys. J.377. 510-518 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. Nozawa: "A study of ^<13>CO cloud cores in Ophiuchus." Astrophys. J. Suppl.77. 647-675 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Fukui: "A new 4m millimeter-wave telescope for a southern sky CO survey." IAU Symposium 148, The Magellanic Clouds. 105-106 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] A.Mizuno: "A remarkable multilobe molecular outflow:p Ophiuchi East,associated with IRAS 16293ー2422" Astrophys.J.356. 184-194 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Fukui: "A comparative study of star formation efficiencies in nearby molecular cloud complexes" in IAU Symposium 147 Fragmentation of molecular clouds and star formation. in press. (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] H.Ogawa: "A110 GHz SIS receiver for radio astronomy" Int.J.Infrared and Millimeter Waves. 11. 717-726 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Uchida: "Velocity split along the Rho Ophiuchi streamer (North):spinning streamer as "angular momentum drain" from massive cloud of active starーdormation" Publ.Astron.Soc.Japan. 42. 69-83 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] S.Nozawa: "A study of ^<13>CO cloud cores in Ophiuchus," Astrophys.J.Suppl.submitted. (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Fukui: "Molecular outflows" in Protostars and Planets III. in press. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] K.Sugitani: "A catalog of brightーrimmed clouds with IRAS point sources:candidates for star formation by radiationーdriven implosion.I.Norther hemisphere" submitted to Ap.J.Suppl.(1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] J.Yang: "A newly discovered molecular cloud in Cep OB4" Ap.J.362. 538-544 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] J.Yang: "A millimeter wave line study of L1287:a case of induced star formation by stellar wind compression?" Ap.J.in press. (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] J.Yang: "A CO study of Sharpless 171;Evidence for interaction between the HII region and its neighboring molecular cloud" submitted to Ap.J.(1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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