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

智利北部亚毫米波原子碳发射的大规模调查

• 批准号: 12573001
• 负责人: YAMAMOTO Satoshi
• 金额: $ 9.86万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12573001/
• 关键词: Submillimeter-wave; neutral carbon atom; molecular cloud; Galaxy; radio telescope; 星形成; サブミリ波

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.

该项目的主要目的是利用在中国北部Pampa la Bola（海拔4800m）运行的新型便携式18 cm亚毫米波望远镜对中性碳原子进行大规模调查观测。为此，我们首先使用 GN 2 级制冷机开发了紧凑型亚毫米波接收器。接收机噪声温度达到了低至200 K。在项目期间，我们用这台望远镜进行了3次测试观测（2001年3月、2001年9月和2002年9月）。第一次运行时，我们在运输过程中望远镜的Az驱动系统出现了严重故障，我们只在潘帕拉博拉站点确认了个别仪器的性能。在第二轮中，我们成功观测到了492 GHz的月球和太阳的连续发射，还观测到了高层大气的臭氧发射。在第三次运行中，我们终于成功利用该望远镜系统探测到中性碳原子朝向pOph分子云的亚毫米波谱线（492 GHz）。此外，我们还观察到了包括 NGC6334 和 M17 在内的多个分子云。在 M17 中已清楚地检测到速度宽度为 40 km/s 的特别令人敬畏的发射。由于这种翼发射在空间上延伸，因此不能归因于该区域原恒星的分子流出。相反，这种发射可能代表了一种尚未被识别的新型星际云。 如上所述，我们已经建立了18厘米望远镜系统，并获得了具有天体物理学意义的新科学成果。

项目成果

Kazuhisa Kamegai: "Distribution of the [CI]Emission in the ρ Ophiuchi Dark Cloud"Astrophysical Journal. (In press).

Kazuhisa Kamegai：“蛇夫内暗云中[CI]发射的分布”天体物理学杂志（正在出版）。

M. Ikeda et al.: "The distribution of atomic carbon in the Orion giant molecular cloud 1"Astrophys. J.. 467-485 (2002)

M. Ikeda 等人：“猎户座巨型分子云 1 中原子碳的分布”天体物理学。

Tomoya Hirota: "L1521E : A Starless Core in the Early Evolutionary Stage?"Astrophysical Journal. 565. 359-363 (2002)

广田朋也：“L1521E：早期进化阶段的无星核心？”天体物理学杂志。

Masafumi Ikeda: "Distribution of Atomic Carbon in the Orion giant molecular clouds"Astrophysical Journal Supplement. (印刷中).

Masafumi Ikeda：“猎户座巨型分子云中原子碳的分布”天体物理学杂志增刊（正在出版）。

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)

M. Ikeda等人：“致密岩心中的H^ 13 CN / HC ^ 15 N丰度比：同位素丰度的可能来源与来源变化？”天体物理学。