论文标题
大阪大学的现状和未来计划1.85-m mm-submm望远镜项目
Current status and future plan of Osaka Prefecture University 1.85-m mm-submm telescope project
论文作者
论文摘要
我们报告了安装在Nobeyama无线电天文台（海拔1400 m）和未来计划的1.85 m mm-submm望远镜的当前状态。科学的目标是通过获得具有几种弧形角度分辨率的分子气体分布，揭示银河系中分子云的物理/化学特性。主要在Linux-PC上建立的半自动观察系统可实现有效的操作。大规模的Co $ j = $ 2--1分子云的调查（例如Orion-A/B，Cygnus-X/OB7，Taurus-California-Perseus Complex和Galactic Plane），以及对较小分子物种的发射线的试点调查。望远镜还为新设备和想法的技术演示提供了机会。例如，PLM（路径长度调制器）和基于波导的边带分离过滤器的实际实现，新设计的基于波导的圆形偏振器和OMT（ORTHomode transducer）的安装等等。下一步，我们现在计划将望远镜转移到智利的San Pedro de Atacama（海拔2500 m），并正在开发覆盖210--375 GHz（对应于Alma的6---7）和全自动观察系统的非常宽带接收器。新的望远镜系统将在南半球的银河平面和大/小麦芽云的分子云的空间和频域中提供大规模数据。与半乳酸外的数据相比，数据将是珍贵的，这些数据将与阿尔玛（Alma）获得，因为6/7频带是阿尔玛（Alma）时期内测量的最有效频段。
We report the current status of the 1.85-m mm-submm telescope installed at the Nobeyama Radio Observatory (altitude 1400 m) and the future plan. The scientific goal is to reveal the physical/chemical properties of molecular clouds in the Galaxy by obtaining large-scale distributions of molecular gas with an angular resolution of several arcminutes. A semi-automatic observation system created mainly in Python on Linux-PCs enables effective operations. A large-scale CO $J=$2--1 survey of the molecular clouds (e.g., Orion-A/B, Cygnus-X/OB7, Taurus-California-Perseus complex, and Galactic Plane), and a pilot survey of emission lines from minor molecular species toward Orion clouds have been conducted so far. The telescope also is providing the opportunities for technical demonstrations of new devices and ideas. For example, the practical realizations of PLM (Path Length Modulator) and waveguide-based sideband separating filter, installation of the newly designed waveguide-based circular polarizer and OMT (Orthomode Transducer), and so on. As the next step, we are now planning to relocate the telescope to San Pedro de Atacama in Chile (altitude 2500 m), and are developing very wideband receiver covering 210--375 GHz (corresponding to Bands 6--7 of ALMA) and full-automatic observation system. The new telescope system will provide large-scale data in the spatial and frequency domain of molecular clouds of Galactic plane and Large/Small Magellanic Clouds at the southern hemisphere. The data will be precious for the comparison with those of extra-galactic ones that will be obtained with ALMA as the Bands 6/7 are the most efficient frequency bands for the surveys in extra-galaxies for ALMA.
