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Large-Scale Far-Infrared Spectroscopic Study of the Galactic Center Region with High Spatial Resolution

Research Project

Project/Area Number 12440055
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

NAKAGAWA Takao  ISAS, SPACE ASTROPHYSICS, PROFESSOR, 宇宙圏研究系, 教授 (20202210)

Co-Investigator(Kenkyū-buntansha) YAMAMURA Issei  ISAS, SPACE ASTROPHYSICS, RESEARCH ASSOCIATE, 宇宙圏研究系, 助手 (40322630)
KANEDA Hidehiro  ISAS, SPACE ASTROPHYSICS, RESEARCH ASSOCIATE, 宇宙圏研究系, 助手 (30301724)
MURAKAMI Hiroshi  ISAS, SPACE ASTROPHYSICS, PROFESSOR, 宇宙圏研究系, 教授 (40135299)
SHIBAI hiroshi  NAGOYA Univ., Dep. of Science, PROFESSOR, 大学院・理学研究科, 教授 (70154234)
MATSUURA Shuji  ISAS, SPACE ASTROPHYSICS, RESEARCH ASSOCIATE, 宇宙圏研究系, 助手 (10321572)
土井 靖生  東京大学, 教養学部, 助手 (70292844)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥12,700,000 (Direct Cost: ¥12,700,000)
Fiscal Year 2002: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2001: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2000: ¥5,900,000 (Direct Cost: ¥5,900,000)
KeywordsGalactic center / far-infrared Spectroscopy / far-infrared [CII] line / balloon-borne telescope / star-formation rate / photo-dissociation region / interstellar matter / interstellar radiation field
Research Abstract

Our previous balloon-borne observations revealed that the far-infrared [CII] line is systematically weak toward the Galactic center. We proposed a hypothesis that this weakness of the [CII] line can be attributed to the soft interstellar radiation field in the Galactic center. This hypothesis can also explain the ubiquitousness of warm molecular clouds in the region. Moreover, this hypothesis leads to an interesting prediction that the star-formation rate in the Galactic center region is low.
However, most of the above discussions relied on observation with very poor spatial resolution, and high-spatial observations had been long-awaited.
In order to check the above hypothesis, we performed high-spatial resolution observations of the far-infrared [CII] line using a balloon-borne telescope. This is a joint project with the Tata Institute of Fundamental Research (TIFR) in India. TIFR is in charge of the 1m balloon-borne telescope, and the Japanese group is in charge of the far-infrared Fabry-Perot spectrometer.
We performed two balloon flights in the period of the fiscal year from 2000 to 2002, and made high-spatial spectroscopic observations of Galactic star-forming regions. Furthermore, we analyzed observational results of our previous balloon observations and previous space-borne missions. We thereby obtained very important information to understand the effects of radiation field on interstellar clouds.
Through these activities, we made detailed study of interaction between interstellar radiation field and interstellar matter as a basis of the understanding the physical processed in the Galactic center.

Report

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

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Takao Nakagawa: "Japanese Activities of Far-Infrared Astronomical Spectroscopy with Balloon-Borne Telescopes"Advances Space Research. Vol.30, No.5. 1307-1312 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Shibai, S.Arimura, et al.: "FIRBE : Far-Infrared Balloon-Borne Experiment"Advances Space Research. Vol.30, No.5. 1289-1295 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] B.Mookerjea, S.K.Ghosh, et al.: "Mapping of Large Scale 158μm [CII] Line Emission : Orion A"Astronomy & Astrophysics. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Takao Nakagawa: "Japanese Activities of Far-Infrared Astronomical Spectroscopy with Balloon-Borne Telescopes"Advances Space Research. Vol. 30-No. 5. 1307-1312 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Shibai, S. Arimura, et.al.: "FIRBE : Far-Infrared Balloon-Borne Experiment"Advances Space Research. Vol. 30-No. 5. 1289-1295 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] B. Mookerjea, S. K. Ghosh, et.al.: "Mapping of Large Scale 158 μm [CII] Line Emission : Orion A"Astronomy & Astrophysics. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Takao Nakagawa: "Japanese Activities of Far-Infrared Astronomical Spectroscopy with Balloon-Borne Telescopes"Advances Space Research. Vol.30, No.5. 1307-1312 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Shibai, S.Arimura, et al.: "FIRBE : Far-Infrared Balloon-Borne Experiment"Advances Space Research. Vol.30, No.5. 1289-1295 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] B.Mookerjea, S.K.Ghosh, et al.: "Mapping of Large Scale 158μm [CII] Line Emission : Orion A"Astronomy & Astrophysics. (in press).

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Makiuti, H.Shibai, T.Nakagawa et al.: "Diffuse far-infrared [CII] line emission from high Galactic latitude"Astronomy and Astrophysics. 382. 600-609 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Shibai, S.Arimura, Y.Doi, T.Nakagawa, M.Narita, et al.: "FIRBE : New Japanese Balloon-Borne Infrared Telescope"Journal de Physique IV. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] B.Mookerjea, S.K.Ghosh, H.Kaneda, T.Nakagawa, D.K.Ojha, et al.: "Mapping of the Orion molecular cloud in the [CII] line and continuum at 158μm"Bulletin of the Astronomical Society of India. 29. 337-338 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Kenji Mochizuki,and Takao Nakagawa: "Photon-Dominated Region Models for Global Properties of the Galaxy"The Astrophysical Journal. 535. 118-138 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Takao Nakagawa: "Japanese Activities of Far-Infrared Astronomical Spectroscopies with Balloon-Borne Teltscopes"Advances in Space Research.

    • Related Report
      2000 Annual Research Report
  • [Publications] K.-W.Chan,T.L.Roellig,T.Onaka,M.Mizutani,K.Okumura,I.Yamamura,T.Tanabe,H.Shibai,T.Nakagawa and H.Okuda: "Unidentified Infrared Emission Bands in the Diffuse Interstellar Medium"The Astrophysical Journal. 546. 273-278 (2001)

    • Related Report
      2000 Annual Research Report

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

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