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星生成領域の構造と物理

Research Project

Project/Area Number 04233208
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionThe University of Tokyo

Principal Investigator

長谷川 哲夫  東京大学, 理学部, 助教授 (50134630)

Co-Investigator(Kenkyū-buntansha) 半田 利弘  東京大学, 理学部, 助手 (40202270)
林 正彦  国立天文台, 助教授 (10183914)
祖父江 義明  東京大学, 理学部, 教授 (10022667)
Project Period (FY) 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥26,300,000 (Direct Cost: ¥26,300,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 1992: ¥16,200,000 (Direct Cost: ¥16,200,000)
Keywords電波天文学 / 星間物質 / 銀河構造 / 星形成 / 星間分子 / ミリ波 / サブミリ波 / 銀河系
Research Abstract

野辺山に設置した60cm望遠鏡1号機に230GHzSIS受信器を搭載し、北天銀河の観測を昨年度に引き続き実施した。本年度は、主に後述の3つの領域について観測を行った。このデータを、スミソニアン天文台のグループとの協力により、CO(J=1-0)輝線データと比較し、以下の結果を得た。
(a)超新星残骸と相互作用する分子雲
超新星残骸W44に付随する分子雲の観測を行い、超新星残骸と相互作用している数pcの範囲でのみR_<2-1/1/0>(CO(J=2-0)とCO(J=1-0)との輝線強度比)が高く、衝撃波の影響を受けていることがわかった。
(b)銀河系外域としてのW3・4・5領域
この領域では、銀河系内域で見られたR_<2-1/1-0>の減少傾向の外挿にはのらず、高いR_<2-1/1-0>を示す。これは、渦状腕領域では全CO分子ガス輝線強度に対して高密度分子ガスからの輝線強度の割合が高いことを示している。
(c)棒状構造の影響を受けていると考えられる銀河系内域(2°<l<20°)
分子ガスの存在のピークである銀河中心距離R=4kpcよりも内側のR=2kpcまで、中心に向かうに従って、R_<2-1/1-0>はほぼ単調に増加し、密度の高い分子ガスの割合が増加していることを示す。さらに、少なくともR=4kpcでは、銀河面から離れるに従って、R_<2-1/1-0>が減少していることがわかった。
また、広く研究者に公開するため、これまでの観測データの整理を行った。

Report

(3 results)
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] T.Hasetawa,et al: "A Large-Scale Cloud Collision in the Galactic Center Moleculan Cloud Near Sagittavius B2" the Astrophysical Journal. 429. L77-L80 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Sofue: "Giant Explosion at the Galactic Center and Huge Shocked Shells in the Halo" the Astrophysical Journal. 431. L91-L93 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Handa,et al.: "Detection of a Circumscellar Gas around DM Tau;A Protoplaretary Disk riound a Single Star?" the Astrophysical Journal. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Hayashi,et al.: "A C^<18>O(J=1-0)Survey of Protostellar Candidates Embedded in the Taurus Molecular Clorud" the Astrophysical Journal. 426. 234-239 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Sakamoto,et al.: "A Large Area CO(J=2-1)Mapping of the Giant Molesular Clouds in Orion" the Astrophysical Journal. 425. 641-652 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Wada,et al.: "Gasdynamical Approach to a Face-on View of the Milky Way" the Astrophysical Journal. 437. L123-L125 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Hasegawa: "The Large-Scale Variation of Physical Conditions of Molecular Gas in the Galaxy" J.of Astron.& Astrophys.(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Sofue: "CO Observations of Edgc-on Galaxies,III.NGC891:Threshold Radius for a Star-Formation Disk" Publ.of Astron.Soc.Japan. 45. 139-151 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Handa: "A Gradient of the CO J=2-1/J=1-0 Intersity Ratio over the Galactic Plane" American Inst.Phys.Conference Proceedings. 278. 315-318 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Sakamoto: "A Large-Scale CO J=2-1 Mapping of the Giant Molecular Clouds in Orion" Astrophys.J.(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Hasegawa: "A Large-Scale Cloud Collision in the Galactic Cauter Molecular Clouds Near Sgr B2" Astrophys.J.Letters. (印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Hayashi: "A Dynamically Accreting Gas Disk Around HL Tauri" Astrophys.J.Letters. 418. L71-L74 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Toshihiro HANDA他: "A Gradient of the CO J=2-1/J=1-0 Intensity Ratio Over the Galactic Plane." Proceedings of the conference “Back to the Galaxy",ASP Conference Series.

    • Related Report
      1992 Annual Research Report
  • [Publications] Seiichi SAKAMOTO他: "A Large Area CO(J=2-1) Mapping of the Orion Giant Molecular Clonds" Proceedings of the conference “Back to the Galaxy",ASP Conference Series.

    • Related Report
      1992 Annual Research Report
  • [Publications] Tomoharu OKA他: "CO(J=2-1) Observations of the Molecular Cloud Complex in the Galactic Center" Proceedings of the conference“Back to the Galaxy",ASP Comference Series.

    • Related Report
      1992 Annual Research Report
  • [Publications] Tetsuo HASEGAWA他: "A Large-Scale Cloud Collision in the Galactic Center Molecular Cloud near Sgr B2" Astrophysical Journal.

    • Related Report
      1992 Annual Research Report
  • [Publications] Yoshiaki SOFUE他: "High-Regolution CO Observations of the Radio-Lobe Edge-on Galaxy NGC3079" Publ.Astron.Soc.Japan. 44. 353-365 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Masahiko HAYASHI他: "A Clumpy Ring of CS(J=1-0) Emission around the S140 IR Cluster" Publ.Astron.Soc.Japan. 44. 391-405 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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