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Observational Study of the Physical Properties of the Hierarchy Commonly Found in Star-Forming Molecular Clouds

Research Project

Project/Area Number 09640326
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionINSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE

Principal Investigator

KITAMURA Yoshimi  Institute of Space and Astronatical Science, Research Division for Basic Space Science, Associate Professor, 共通基礎研究系, 助教授 (30183792)

Co-Investigator(Kenkyū-buntansha) SUNADA Kazuyoshi  National Astronomical Observatory, Radio Astronomy Division, Assistant, 電波天文学研究系, 助手 (90270454)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1998: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1997: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsRadio Astronomy / Molecular Clouds / Star Formation / Hierarchy / Taurus / Ophiuchus / Orion / IDL
Research Abstract

We have made high-quality mapping observations toward the three typical star-forming clouds (Taurus, Orion, and Ophiuchus), in order to investigate the hierachical structure in molecular clouds and its influence on star formation. The Nobeyama 45 m telescope equipped with the 25-beam array receiver system (BEARS) makes it possible to homogeneously cover the spatial ranges from the overall extension (-1 pc) of the clouds down to small scales (-0.01 pc) comparable to cloud cores. Our main results are as follows.
1. Development of a new data analysis system (BMAS) for BEARS observations.
We have developped a new analysis system (BMAS) for large-scale and high-resolution mapping data with BEARS.We used the programming language, IDL on workstation platforms and BMAS has GUI which is user-friendly. Standard analysis tools in radio astronomy and statistical analysis tools including spectral analysis are built in BMAS.One can efficiently analyze huge data from BEARS with BMAS.
2. Dominance of smaller clumps than cores in molecular clouds.
We have found that fine structures (clumps) smaller than cores are dominant in molecular clouds by analyzing the BEARS high-quality mapping data with BMAS.The clumps are considered to play an important role in star formation within cloud cores. Furthermore, we found the following new results for individual clouds, In the Taurus cloud, we propose a new classification of protostars based on the spatial distribution of dense gas. In the Orion cloud, there exist fine filaments in the well-known large-scale filamentary structure. And in the Ophiuchus cloud, we revealed the early evolution of star-forming cores by comparing our mapping data with the infrared images taken by ISO.Our analysis is in progress.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Yoshimi Kitamura: "NMA Imaging of Envelopes and Disks around Low Mass Protostars and T Tauri Stars" Herbig-Haro Flows and the Birth of Low Mass Stars. 381-390 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 岡本創、松浦周二、北村良実: "宇宙塵のリモートセンシング:惑星科学から天文学まで" 遊星人. Vol.6 No.4. 352-360 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kazuyoshi Sunada: "Spectrometers for 5×5 SIS Focal Plane Array Receiver System" URSI National Radio Science Meeting. 167 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kazuyoshi Sunada: "Observation of the ρ-Ophiuchi Star Forming Region with ISO PHOT,NRO 45-m,and NMA" ASP Conference Series, Star Formation with the Infrared Space Observatory(ISO). 132. 203-208 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takeshi Kamazaki: "Search for Protostars in the ρ Ophiuchi Star Formation Region with the ISO PHOT" ASP Conference Series, Star Formation with the Infrared Space Observatory(ISO). 132. 370-373 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ymiko Oasa: "ISOPHOT Observations of NOBEYAMA Dense Cores in the ρ-Ophiuchi Cloud" The Universe as seen by ISO(held at Paris in France). 5-8 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kazuyoshi Sunada: "High-Resolution C^<18>O Mapping Observations of Heiles' Cloud 2 --Statistical Prop-erties of the Line Width --" Interstellar Turbulence. in press. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Masao Saito: "The Initial Conditions for Formation of Low-Mass Stars: Kinematics and Density Structure of the Protostellar Envelope in B335" Astrophysical Journal. 518(in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Kitamura, M.Saito, R.Kawabe, and K.Sunada: ""NMA Imaging of Envelopes and Disks around Low Mass Protostars and T Tauri Stars"" IAU Symposium No.182, Herbig-Haro Flows and the Birth of Low Mass Stars. 381-390 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Okamoto, S.Matsuura, and Y.Kitamura: ""Remote Sensing of Cosmic Dust : from Planetary Science to Astronomy"" Planetary People (The Japanese Society for Planetary Sciences). Vol.6, No.4. 352-360 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Sunada, S.K.Okumura, M.Ikeda, N.Kawaguchi, T.Iwasa, A.Tanaka, K.Ozeki, and K.Natori: ""Spectrometers for 5*5 SIS Focal Plane Array Receiver System"" URSI National Radio Science Meeting. 167 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Sunada, T.Umemoto, M.Tamura, M.Saito, T.Kamazaki, Y.Oasa, and Y.Kitamura: ""Observation of the p-Ophiuchi Star Forming Region with ISO PHOT,NRO 45-m, and NMA"" ASP Conference Series, Star Formation with the Infrared Space Observatory (ISO). Vol.132. 203-208 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Kamazaki, K.Sunada, M.Saito, M.Tamura, T.Umemoto, Y.Oasa, and Y.Kitamura: ""Search for Protostars in the p Ophiuchi Star Forming Region with the ISO PHOT"" ASP Conference Series, Star Formation with the Infrared Space Observatory (ISO). Vol.132. 370-373 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Oasa, T.Kamazaki, K.Sunada, M.Tamura, T.Umemoto, Y.Kitamura, and M.Saito: ""ISOPHOT Observations of NOBEYAMA Dense Cores in the p-Ophiuchi Cloud"" The Universe as seen by ISO. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Sunada and Y.Kitamura: ""High-Resolution C^<18>O Mapping Observations of Heiles'Cloud 2-Statistical Properties of the Line width-"" Interstellar Turbulence. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Saito, K.Sunada, R.Kawabe, Y.Kitamura, and N.Hirano: ""The Initial Conditions for Formation of Low-Mass Stars : Kinematics and Density Structure of the Protostellar Envelope in B335"" Astrophysical Journal. Vol.518 (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kazuyoshi Sunada: "High-Resolution C^<18>O Mapping Observations of Heiles'Cloud 2 …Statistical Properties of the Line Width…" Interstellar Turbulence (held at Puebla in Mexico). (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Yumiko Oasa: "ISOPHOT Observations of NOBEYAMA Dense Cores in the ρ-Ophiuchi Cloud" The Universe as seen by ISO(held at Paris in France). 5-8 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Masao Saito: "The Initial Conditions for Low-Mass Star Formation:Kinematics and Density Structure of the Protostellar Envelope in B335" Astrophysical Journal. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kazuyoshi Sunada: "Spectrometers for 5×5 SIS Focal Plane Array Receiver System" URSI National Radio Science Meeting. 167 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yoshimi Kitamura: "NMA Imaging of Envelopes and Disks around Low Mass Protostars and T Tauri Stars" Herbig-Haro Flows and the Birth of Low Mass Stars. 381-390 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 岡本 創、 松浦周二、 北村良実: "宇宙塵のリモートセンシング:惑星科学から天文学まで" 遊星人. Vol.6 No.4. 352-360 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kazuyoshi Sunada: "Observation of the p-Ophiuchi Star Forming Region with ISO PHOT,NRO 45-m,and NMA" Star Formation with the Infrared Space Observatory(ISO). (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Takeshi Kamazaki: "Search for Protostars in the p-Ophiuchi Star Formation Region With the ISO PHT" Star Formation with the Infrared Space Observatory(ISO). (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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