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A Large Scale Survey of the Subnmillimeter-wave Emission of Atomic Carbon at Northrn Chile

Research Project

Project/Area Number 12573001
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

YAMAMOTO Satoshi  The University of Tokyo, Graduate School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (80182624)

Co-Investigator(Kenkyū-buntansha) TATEMATSU Ken'ichi  National Astronomy Observatory Division of Radio Astronomy, Associate Professor, 電波天文学研究系, 助教授 (40202171)
SAKIMOTO Yutaro  National Astronomy Observatory, Division of Radio Astronormy, Associate Professor, 電波天文学研究系, 助教授 (70262152)
OKA Tomoharu  The University of Tokyo, Graduate School of Science, Assistant, 大学院・理学系研究科, 助手 (10291056)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥15,400,000 (Direct Cost: ¥15,400,000)
Fiscal Year 2002: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 2001: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2000: ¥6,300,000 (Direct Cost: ¥6,300,000)
KeywordsSubmillimeter-wave / neutral carbon atom / molecular cloud / Galaxy / radio telescope / 星形成 / サブミリ波
Research Abstract

The principal aim of this project is a large-scale survey observation of the neutral carbon atom with a new transportable 18 cm submillimeter-wave telescope operated at Pampa la Bola (alt. 4800m) in northern Chi I e. For this purpose, we have first developed a compact submillimeter-wave receiver by using a GN 2 stage refrigerator. The receiver noise temperature achieved was as low as 200 K. With this telescope, we conducted the test observations three times during the project period (March 2001, September 2001, and September 2002).
In the first run, we had a serious trouble in the Az driving system of the telescope during transportation, and we only confirmed the performance of individual instruments at the Pampa la Bola site. In the second run, we successfully observed the continuum emission from the moon and the sun at 492 GHz, and also observed the ozone emission from the upper atmosphere. In the third run, we finally succeeded in detecting the submillimeter-wave line (492 GHz) of the neutral carbon atom toward the pOph molecular cloud with this telescope system. Furthermore, we observed several molecular clouds including NGC6334 and M17. Particularly awing emission with the velocity width of 40 km/s has been detected clearly in M17. Since this wing emission is spatially extended, it cannot be ascribed to the molecular outflow from protostars in this region. Rather this emission may represent a new type of interstellar clouds that has not been recognized yet.
As described above, we have established the 18 cm telescope system, and have obtained new scientific results of astrophysical importance.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Satoshi Yamamoto: "Observation of the CI ^3P_2-^3P_1 Line toward the Orion Kleinmann-Low Region"Astrophysical Journal. 547. L165-L169 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tomoya Hirota: "Observations of DNC and HN^<13>C in Dark Cloud Cores"Astrophysical Journal. 547. 814-828 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tomoya Hirota: "L1521E : A Starless core in the early evolutionary stage?"Astrophysical Journal. 565. 359-363 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Masafumi Ikeda: "The Distribution of Atomic Carbon in the Orion Giant Molecular Cloud 1"Astrophysical Journal Supplement. 139. 467-485 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Masafumi Ikeda: "The H^<13>CN/HC^<15>N Abundance Ratio in Dense Cores : Possible Source-to-Source Variation of Isotope Abundances?"Astrophysical Journal. 575. 250-256 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tomoharu Oka: "Observational approach to moleurlar cloud formation"Astronomy at IR/Submm and the Microwave Background. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Yamamoto et al.: "Observation of the Cl ^3P_2-^3P_1 line toward the Orion Kleinmann-Low region"Astrophys. J.. 547. L165-L169 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Hirota et al.: "Observations of DNC and HN^<13>C in dark cloud cores"Astrophys. J.. 547. 814-828 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Hirota et al.: "L1521E: A starless core in the early evolutionary stage?"Astrophys. J.. 565. 359-363 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Ikeda et al.: "The distribution of atomic carbon in the Orion giant molecular cloud 1"Astrophys. J.. 467-485 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Ikeda et al.: "The H^<13>CN/HC^<15>N abundance ratio in dense cores : Possible source-to-source variation of isotope abundances?"Astrophys. J.. 575. 250-256 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Oka et al. , eds. P. Wesselius, and H. Oltof: "Observational approach to molecular cloud evolution , "Astronomy at IR/Submim and the Microwave Background""COSPAR 2002, E1.5.. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tomoya Hirota: "L1521E : A Starless Core in the Early Evolutionary Stage?"Astrophysical Journal. 565. 359-363 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Masafumi Ikeda: "The Distribution of Atomic Carbon in the Orion Giant Molecular Cloud 1"Astrophysical Journal Supplement Sereis. 139. 467-485 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Masafumi Ikeda: "The H13CN/HC15N Abundance Ratio in Dense Cores: Possible Source-to-Source Variation of Isotope Abundances?"Astrophysical Journal. 575. 250-256 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kazuhisa Kamegai: "Distribution of the [CI] Emission in the ρ Ophiuchi Dark Cloud"Astrophysical Journal. (In press).

    • Related Report
      2002 Annual Research Report
  • [Publications] Satoshi Yamamoto: "Observation of the CI ^3P_2^<-3>P_1 Line toward the Orion KL Region"Astrophysical Journal. 547. L165-L169 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Tomoharu Oka: "Atomic Carbon and CO Isotope Emission in the Vicinity of DR15"Astrophysical Journal. 558. 176-184 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Masafumi Ikeda: "Distribution of Atomic Carbon in the Orion giant molecular clouds"Astrophysical Journal Supplement. (印刷中).

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Sekimoto: "The Mt.Fuji Submillimetre-wave Telescope"Review of Scientific Instruments. 71. 2895-2907 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Shinnaga: "Zeeman Effect on the Rotational Level of CCS and SO in the ^3Σ-Ground State"Astrophysical Journal. 544. 330-335 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Hirota: "Observation of DNC and HN^<13>C in Dark Cloud Cores"Astrophysical Journal. 547. 814-828 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Yamamoto: "Observation of the Cl ^3P_2-^3P_1 Line toward the Orion KL Region"Astrophysical Journal. 547. L165-L169 (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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