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マゼラン星雲内の分子雲の掃天観測

Research Project

Project/Area Number 10147208
Research Category

Grant-in-Aid for Scientific Research on Priority Areas (A)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionOsaka Prefecture University (1999-2001)
Nagoya University (1998)

Principal Investigator

小川 英夫  大阪府立大学, 総合科学部, 教授 (20022717)

Co-Investigator(Kenkyū-buntansha) 水野 亮  名古屋大学, 大学院・理学研究科, 助教授 (80212231)
福井 康雄  名古屋大学, 大学院・理学研究科, 教授 (30135298)
米倉 覚則  大阪府立大学, 総合科学部, 助手 (90305665)
大西 利和  名古屋大学, 大学院・理学研究科, 助手 (30314058)
Project Period (FY) 1998 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥77,100,000 (Direct Cost: ¥77,100,000)
Fiscal Year 2001: ¥8,900,000 (Direct Cost: ¥8,900,000)
Fiscal Year 2000: ¥10,200,000 (Direct Cost: ¥10,200,000)
Fiscal Year 1999: ¥26,500,000 (Direct Cost: ¥26,500,000)
Fiscal Year 1998: ¥31,500,000 (Direct Cost: ¥31,500,000)
Keywords大小マゼラン雲 / 巨大分子雲 / 星団 / 電波天文学 / スーパー・ジャイアント・シェル / 大マゼラン雲
Research Abstract

本研究はチリのラス・カンパナス天文台に移設した名古屋大学「なんてん」望遠鏡を用い、大・小マゼラン銀河内の分子雲の掃天観測を行ない、銀河ごとの物理環境の違いが分子雲形成および星・星団形成にどのような影響を与えているかを観測的に明らかにすることを目的としている。
第一期掃天観測に続き、大マゼラン銀河に対し4倍の積分時間をかけて行った高感度の詳細観測が、25平方度の範囲について終了した。高感度観測により1万太陽質量程度の分子雲まで検出することが可能となり、230個あまりの分子雲が検出された。そのうち3点以上で検出された分子雲168個について分子雲の物理諸量が求められた。その結果、大マゼラン銀河の質量関数のべき指数が我々の銀河系の値-1.5よりもやや大きめの-1.9でよくフィットできることが明らかになった。この原因としては、大マゼラン銀河では銀河系よりも星団形成が活発に起きており、星団からの強い紫外光により巨大分子雲が銀河系内よりも早く破壊され、相対的に小質量の分子雲に分裂・散逸しているためである可能性が考えられる。
小マゼラン銀河に対しても、メイン・バーの北東と南西、そしてWing部のN84領域の約0.9平方度(807点)にわたる領域のマッピング観測を行った。その結果、21個の分子雲を検出した。特に、Wing部のN84でTR^*〜0.36Kという小マゼラン銀河内で最も高いアンテナ温度が初めて検出された事は特筆に値する。観測した領域の分子ガスの全質量は約400万太陽質量、一酸化炭素電波強度と水素分子柱密度の比であるX-factorは、銀河系の約10分の1に相当する2.5×10^21cm^-2(K km/s)^-1と見積もられた。

Report

(4 results)
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (42 results)

All Other

All Publications (42 results)

  • [Publications] Y.Fukui: "On the Mass Spectrum of Giant Molecular Clouds in the Large Magellanic Cloud"Publ.Astron.Soc.Japan. 53. L41-L44 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] N.Mizuno: "First Results of a CO Survey of the Small Magellanic Cloud with NANTEN"Publ.Astron.Soc.Japan. 53. L45-L49 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] R.Yamaguchi: "Sensitive CO Observations of the LMC Supergiant Shells with NANTEN: Their Effects on the Formation of Molecular Clouds and Stellar Clusters"Publ.Astron.Soc.Japan. 53. 959-969 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] N.Mizuno: "A CO Survey of the LMC with NANTEN: II.Catalog of Molecular Clouds"Publ.Astron.Soc.Japan. 53. 971-984 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] R.Yamaguchi: "A CO Survey of the LMC with NANTEN: III.Formation of Stellar Clusters and Evolution of Molecular Clouds"Publ.Astron.Soc.Japan. 53. 985-1001 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Matsunaga: "Detection of Eight Molecular Supershells in the Southern Milky Way with NANTEN"Publ.Astron.Soc.Japan. 53. 1003-1016 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Onishi: "A Survey for High-Latitude Molecular Clouds toward Infrared-Excess Clouds with NANTEN"Publ.Astron.Soc.Japan. 53. 1017-1023 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Moriguchi: "A ^<12>CO(J=1-0)Survey of Molecular Clouds toward the Vela Supernova Remnant with NANTEN"Publ.Astron.Soc.Japan. 53. 1025-1036 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Saito: "The Most Massive C^<18>O Molecular Complex in Centaurus and Star Formation Therein"Publ.Astron.Soc.Japan. 53. 1037-1051 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Aoyama: "A Large-Scale Study of H^<13>CO^+ and C^<18>O(J=1-0)in Orion B"Publ.Astron.Soc.Japan. 53. 1053-1062 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Kun: "Study of Molecular Clouds and Star Formation in the Region of IC 2118"Publ.Astron.Soc.Japan. 53. 1063-1070 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.Mizuno: "A Large Scale ^<12>CO(J=1-0)Survey toward the Chamaeleon Region with NANTEN"Publ.Astron.Soc.Japan. 53. 1071-1080 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Tachihara: "^<12>CO Molecular Cloud Survey and Global Star Formation in Lupus"Publ.Astron.Soc.Japan. 53. 1081-1096 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.Kawamura: "Study of L688/L694/L700:a Complex of Dark Clouds in Aquila"Publ.Astron.Soc.Japan. 53. 1097-1108 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Hayakawa: "CO Column Density and Extinction in the Chamaeleon II-III Dark-Cloud Complex"Publ.Astron.Soc.Japan. 53. 1097-1108 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Dobashi: "The Most Luminous Protostars in Molecular Clouds: A Hint to Understand the Stellar Initial Mass Function"Publ.Astron.Soc.Japan. 53. 85-92 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Dobashi: "A New Look at CO Outflows in the Dark Cloud Complex near IC 5146"Publ.Astron.Soc.Japan. 53. 811-820 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Tachihara: "C^8O Observations of the Dense Cloud Cores and Star Formation in Ophiuchus"Astrophysical Journal. 528. 817-840 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Tachihara: "Molecular Clouds around a Runaway O star, ζ Ophiuchi"Publications of the Astronomical Society of Japan. 52. 1147-1155 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Mizuno: "A CO Survey of the LMC; II.Catalog of Molecular Clouds"Publications of the Astronomical Society of Japan. 53(印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] R.Yamaguchi: "Molecular Clouds in the Supergiant Shell LMC4; Evidence for Triggered Cluster Formation"Astrophysical Journal(Letters). (印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Fukui: "Molecular Clouds and Star Formation in the Local Group"Modes of Star Formation and the Origin of Field Populations. (印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y. Yonekura: "Search for molecular clouds toward intermediate-to-high Latitude IRAS sources in the southern sky"PASJ. 51. 837-850 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] A. Mizuno: "Dense cores and star-formation activities in the Chamaeleon dark could comlex"PASJ. 51. 859-870 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] R. Yamaguchi: "Molecular clouds and star formation in the Southern Hll Regions"PASJ. 51. 791-818 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] N. Yamaguchi: "A study of dense molecular gas and star formation toward the Vela Molecular Ridge with NANTEN"PASJ. 51. 775-790 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Fukui: "First Results of a CO Survey of the Large Magellanic Cloud with NANTEN ; Giant Molecular Cloud as Formation Sites of Populous Clusters"PASJ. 51. 745-749 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Fukui: "Discovery of the Carina Flare with NANTEN ; Evidence for a Supershell That Triggered the Formation of Stars and Massive Molecular Clouds"PASJ. 51. 751-764 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H. Saito: "A Study of the Molecular Cloud Toward the Hll Regions S35 and S37 with NANTEN"PASJ. 51. 819-835 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] A. Kawamura: "A Dark-Cloud Crnplex in Aquila: Small Molecular Clouds Possibly Associated with he Aquila Rift""PASJ. 51. 851-858 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T. Onishi: "NANTEN Observations of the Pipe Nebula ; A Filamentary Massive Dark Cloud with Very Low Star-Formation Activity"PASJ. 51. 871-887 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S. Kato: "NANTEN Observation of the Southern Coalsack in 13CO and C18O J=1-0 Emission"PASJ. 51. 883-893 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Yonekura: "NANTEN Observation of Dense Cores in the Corona Australis Molecular Cloud"PASJ. 51. 911-918 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] A.Mizuno: "“A 13CO (J=1-0) Search for Small Molecular Clouds toward the Chamaeleon-Musca Dark Cloud Complex"" Astrophysical Journal letters. v.507. 83-87 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] A.Kawamura: "A 13CO Survey of Molecular Clouds in Gemini and Auriga" Astrophysical Journal Supplement. v.117. 387-425 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Onishi: "A C18O Survey of Dense Cloud Cores in Taurus : Star Formation" Astrophysical Journal. v.502. 296-314 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Nagahama: "A Spatially Complete 13CO J=1-0 Survey of the Orion A Cloud" Astrophysical Journal. v.116. 336-348 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Yonekura: "A Head-Tail-structured Molecular Cloud and a CO Outflow Associated with IRAS 22103+5828 in S134" Astronomical Journal. v.115. 2009-2017 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] A.Obayashi: "Star Formation in the L1333 Molecular Cloud in Cassiopeia" Astronomical Journal. v.115. 274-285 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.C.Xiao: "A Low-noise 230 GHz SIS Receiver for Radio Astronomy Employing Untuned Nb/AlOx/Nb Tunnel Junction" Int.J.Infrared and Millimeter Waves. v.19. 15-31 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Dobashi: "Interaction between a massive molecular outflow and dense gas associated with IRAS 22142+5206" Astronomical Journal. v.115. 777-786 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 福井 康雄: "大宇宙の誕生" 光文社, 202 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2018-03-28  

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