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

这个项目的主要目的是利用潘帕拉博拉(ALT)的一台新的便携式18厘米亚毫米波望远镜对中性碳原子进行大规模的观测。4800m)。为此，我们首次用GN-2级制冷机研制了一台紧凑型亚毫米波接收机。该望远镜的接收器噪声温度低至200K，在项目期间(2001年3月、2001年9月和2002年9月)进行了三次测试观测。在第一次运行中，望远镜的Az驱动系统在运输过程中出现了严重故障，我们只在潘帕拉博拉现场确认了单个仪器的性能。在第二次运行中，我们成功地观测到了492 GHz的月球和太阳的连续发射，也观测到了高层大气的臭氧发射。在第三次运行中，我们终于用这个望远镜系统成功地探测到了中性碳原子向pOph分子云的亚毫米波线(492 GHz)。此外，我们还观测到了包括NGC6334和M17在内的几个分子云。特别是在M17上观测到了速度宽度为40公里/S的AWW发射。由于这种翼发射在空间上是延伸的，因此不能将其归因于该区域原恒星的分子外流。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意义的新的科学结果。

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.