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FAST VLBI系统和观测研究
陈如荣
国家天文台
摘要:
甚长基线干涉观测是FAST的核心课题之一,除了FAST,还有三架100米级口径的射电望远镜,它们都在参与VLBI课题的研究,我们总结了三架百米级望远镜的主要研究课题,并对适合FAST的VLBI研究方向进行了展望。FAST采用了先进的时频、数据采集终端和存储系统,目前已经安装完成。通过两次条纹测试实验,得到了FAST的首条VLBI观测条纹。作为世界上口径最大的射电望远镜,FAST凭借极高灵敏度优势,可以明显提升现有VLBI网的(<3GHz)观测能力。现有VLBI观测网中,有多个VLBI网的台站位置和观测频率可以与FAST适配。FAST参与这些VLBI观测网,将主要贡献高灵敏度的长基线观测,有利于需要高灵敏度和高分辨率的研究课题。由于FAST换源速度相对较慢,为了能够高效地参与相位参考模式观测,选择具体较近的参考源,或者建设一台小口径的天线将是合理的选择。
关键词:  FAST;VLBI;相位参考;VLBI网
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VLBI system and scientific research of FAST
chenrurong
Abstract:
Very Long Baseline Interference (VLBI) is one of the topic sciences of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Besides FAST, there are three mega radio telescopes with hundred-meter aperture, which all join the VLBI observations and yield many science outputs. We summarize their main VLBI projects and give some suitable VLBI projects for FAST. FAST VLBI system consists of time/frequency system, the data sampling terminal and the data reservation system, which are all state of the art. Two fringe experiments were conducted and the first VLBI fringe between FAST and Tianma telescope was achieved. As the biggest single dish radio telescope in the world, FAST would significantly improve the capability of current VLBI networks below 3 GHz. There are several VLBI networks, such as CVN, EVN and LBA, are suitable for FAST to join, after considering the location of stations and frequency of receivers. FAST would mainly contribute sensitive long baselines to the current VLBI networks, which would benefit the research in need of high resolution and high sensitivity. The slewing speed of FAST is not high. In order to effectively join the phase-referencing observations, selection of nearby calibrator or a new small antenna could be the solution.
Key words:  FAST; VLBI; Phase referencing; VLBI network