Studies of the Radistion Mechanism and the Morphology of the Interstellar Gas by Observation with 2-dimensional Far-Infrared Camera

本研究的主要课题是通过观测星际尘埃颗粒的远红外连续辐射来研究星际云的能量来源。首先，研制了一种新型八元远红外线阵探测器，可以更有效地绘制大范围的天空。该阵列具有线性阵列中最高的响应率和像素大小。为了降低仪器红外发射的主要噪声源，研制了离轴望远镜。探测器和望远镜安装在一个带有姿态控制系统和其他香港功能的气球吊舱上。气球望远镜系统于1993年9月6日在三陆气球中心放飞。本实验成功获得了经20-45度的银河面远红外连续图。中心波长为160微米，空间分辨率为6角分。这个波长没有被IRAS覆盖，而COBE 160微米图的分辨率只有0.7度。因此，这次观测所拍摄的160微米图是一个独特的数据。通过对数据的分析，我们发现银面星际尘埃颗粒的温度在0.1度尺度上几乎是均匀的，这表明尘埃颗粒的分布是均匀的，而不是靠近能量源。这一结论与我们从[CII]线强度图中得到的结论一致。

The main subject of this research is to investigate the energy source of the interstellar clouds by observing far-infrared continuum emisison from the interstellar dust grains.First, an eight-element far-infrared linear array detector was newly developed for mapping an wide area of the sky with higher efficiency. This new array achieved the highest responsivity and the pixel size of the linear array. An off-axis telescope was manufactured in order to reduce the instrumental infrared emission which is the dominant noise source. The detector and the telescope were mounted on a balloon gondola that has an attitudde control system and other HK functions.The balloon telescope system was flown at Sanriku Ballon Center on September 6,1993. This experiment was successfull in obtaining a far-infrared continuum map of the Galactic plane in 20-45 degree in longitude. The center wavelength was 160 micron and the spatial resolution was 6 arcminute. This wavelength had not been covered by IRAS and the COBE 160 micron map has only 0.7 degree resolution. Therefore, the 160 micron map taken by this observatiton is a unique data.Analysing the data, we found the fact that the temperature of the interstellar dust grain in the Galactic plane is nearly uniform in 0.1 degree scale, which suggests that the dust grain distributes uniformely rather than near-by the energy source. This conclusion agrees to that obtained from the [CII] line intensity map taken by us.