Far-Infrared Spectroscopic Study of Interstellar Medium and Star-formation Rate in the Galactic Center

银河系中心星际介质和恒星形成速率的远红外光谱研究

• 批准号: 09440093
• 负责人: NAKAGAWA Takao
• 金额: $ 6.46万
• 依托单位: The Institute of Space and Astronautical Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440093/
• 关键词: Galactic Center; Far-Infrared Spectroscopy; Far-Infrared [CII] line; balloon-borne telescope; Star-Formation Rate; Photo-dissociation Region; Inter Stellar Matter; Inter Stellar Radiation Field; 星生成; 遠赤外〔CII〕線; [CII]スペクトル線; 遠赤外線; 気球望遠鏡; ファブリペ

We made large-scale survey observations of the far-infrared [CII] spectral line from the Galactic plane, and found that the [CII] line is anomalously weak toward the Galactic center. We attribute this weakness to the soft interstellar radiation field in the Galactic center region. If it is the case, our observations suggest that the current star-formation rate in the Galactic center region is relatively low.In order to check the above suggestion, we planned high spatial observations of the [CII] line emission from the Galactic center using the TIFR (TATA Institute of Fundamental Research, India) 1m balloon-borne telescope, and made the first observation with this system successfully during the campaign in 1999. We could not observe the Galactic center in this campaign, but we are now planning to observe the region on the basis of the experience gained during this campaign.We also observed the Galactic center region with the space-borne telescope ISO (infrared Space Observatory). Although we could not observe the whole region, we could cover the whole far-infrared region spectroscopically, and this observation is complement with balloon-borne observations.We also made theoretical calculations of far-infrared emission from photo-dissociation regions to interpret the above observations.

我们对银道面远红外[CII]谱线进行了大规模巡天观测，发现[CII]谱线向银心方向异常弱。我们将这一弱点归因于银河系中心区域的软星际辐射场。如果是这样的话，我们的观测表明目前银心区域的恒星形成率相对较低。为了验证上述建议，我们计划使用TIFR（印度塔塔基础研究所）1m气球载望远镜对银心[CII]线发射进行高空观测，并在1999年的活动中成功地利用该系统进行了首次观测。 这次活动对银河系中心进行了观测，但我们现在正计划根据这次活动所获得的经验对该区域进行观测。我们还利用星载望远镜ISO（红外空间天文台）对银河系中心区域进行了观测。虽然我们无法观测到整个区域，但我们可以在光谱上覆盖整个远红外区域，这一观测与气球观测相补充。我们还对光解离区域的远红外发射进行了理论计算，以解释上述观测结果。

项目成果

Takako Nakagawa,Kenji Mochizuki,Haruyuki Okuda, Yukari Y. Yui, Yasuo Doi, Hiroshi Shibai, Tetsuo Nishimura, and frank J. Low: "Far-Infrared[CII]Line Emission from the Galaxy and Large Magellanic Cloud"Star formation 1999. 24-27 (1999)

Takako Nakakawa、Kenji Mochizuki、Haruyuki Okuda、Yukari Y. Yui、Yasuo Doi、Hiroshi Shibai、Tetsuo Nishimura 和 Frank J. Low：“来自银河系和大麦哲伦星云的远红外 [CII] 线发射”恒星形成 1999。

T. Nakagawa, Y. Y.Yui, Y. Doi, H. Okusda, H. Shibai, K. Mochizuki, T. Nishimura, and F. J. Low: "Far-Infrared[CII]Line survey Observations of the galactic Plane"Astrophysical Journal Supplement. 115. 259-269 (1998)

T. Nakakawa、Y. Y. Yui、Y. Doi、H. Okusda、H. Shibai、K. Mochizuki、T. Nishimura 和 F. J. Low：“远红外[CII]银河平面的线测量观测”天体物理学杂志增刊。

K. Mochizuki & T. Nakagawa: "Photon-Dominated Region Models for Global Properties of the Galaxy"Astrophysical Journal. (印刷中). (2000)

K. Mochizuki 和 T. Nakakawa：“银河系全局特性的光子主导区域模型”（出版中）。

Mochizuki,K.Nakagawa,T.& Onaka,T.: "FIR 〔CII〕 Line Properties of Low-Metal Galuxies" ASP Conf.Ser.132. 386-38 (1998)

Mochizuki, K. Nakakawa, T. 和 Onaka, T.：“低金属星系的 FIR [CII] 线特性”ASP Conf.Ser.132 (1998)。

S. Arimura, H. Shibai, M. Kawada, A. Ito, M. Tanaka, T. Nakagawa, M.Narita, H. Kaneda, M. Tanaka, T. Tohya, S. Makiuti, Y. Okamura, Y. Doi, H. Okuda, T. N. Reagarajan: "New balloon-borne telescope for Far-Infrared astronomy"SPIE Proceedings. 4014(印刷中).

S. Arimura、H. Shibai、M. Kawada、A. Ito、M. Tanaka、T. Nakakawa、M. Narita、H. Kaneda、M. Tanaka、T. Tohya、S. Makiuti、Y. Okamura、Y. Doi, H. Okuda, T. N. Reagarajan：“用于远红外天文学的新型气球载望远镜”SPIE 论文集 4014（正在出版）。