上海天文台65米射电望远镜谱线观测及数据校准

Spectral Line Observation and Data Calibration of Tianma 65m Radio Telescope

谱线观测是上海天文台65 m射电望远镜的主要观测手段之一,在和美国国家射电天文台联合研制脉冲星和谱线观测终端的基础上,开发了观测控制软件,设计了流量定标的硬件和软件,开发了频率校准程序。经过大量的观测测试,证明观测和数据校准系统的有效性,并于2015年下半年对国内用户开放,取得了大量的观测结果。详细介绍本终端的组成和功能,观测控制软件的流程,结合观测数据介绍流量定标和频率校准的处理方法和结果,并给出下一步的工作计划。

To observe spectral line is one of the key targets for Tianma 65m Radio Telescope. Based on the Digital Backend System （DIBAS）-which was jointly designed by National Radio Astronomical Observatory （NRAO） and Shanghai Astronomical Observatory for pulsar and spectral line observation, we have developed a set of observation control software, hardware as well as software for flux calibration, and we have also designed a frequency calibration program for spectral line observation. Meanwhile, we have tested the observation and data calibration system. Results prove that this system is highly effective. Moreover, this system has been open to domestic observers since the second half of 2015. From then on we have obtained considerable results. The first part of this paper introduces in detail the components and functions of DIBAS; the second part shows the working process of the observation control software; combined with observation data, methods of flux calibration and frequency calibration are discussed in the third part; the last part presents our future plans for this system.