FAST VLBI系统和观测研究  

VLBI System and Scientific Research of FAST

作　　者：陈如荣 张海燕[1,2] 金乘进[1,2] 高智胜[1,2] 朱岩 岳友岭[1,2] 朱凯[1,2] CHEN Rurong;ZHANG Haiyan;JIN Chengjin;GAO Zhisheng;ZHU Yan;YUE Youling;ZHU Kai(National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;CAS Key Laboratory of FAST,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]中国科学院国家天文台,北京100101 [2]中国科学院FAST重点实验室,北京100101

出　　处：《深空探测学报》2020年第2期136-143,共8页Journal Of Deep Space Exploration

基　　金：中国科学院天文大科学研究中心2019年度前瞻课题;国家自然科学基金资助项目(U183112);中国科学院战略性先导科技专项(B类)(XDB23000000);对外合作重点项目(114A11KYSB20160008)。

摘　　要：世界上最大的单口径射电望远镜FAST已经完成验收并正式运行,而甚长基线干涉观测是FAST的核心课题之一,FAST可以为甚长基线观测网提供重要贡献。为了发挥FAST在甚长干涉观测网中的作用,总结了国际上其他大型射电望远镜的主要研究成果,结合FAST的特点,挑选适合FAST的研究课题;介绍了FAST现有的VLBI观测系统,和天马望远镜进行的VLBI干涉条纹;讨论了FAST VLBI系统的发展,包括未来适合FAST参与的VLBI观测网。研究最终挑选到了适合FAST VLBI的6个研究课题;应用FAST与天马望远镜获得了首条VLBI干涉条纹;FAST在CVN、EVN、LBA的VLBI观测方面,可发挥其极高灵敏度的优势;研究发现附近的小天线可为FAST参加相位参考观测提供帮助。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.Very Long Baseline Interference(VLBI) is one of the topic sciences of the Five-hundred-meter Aperture Spherical radio Telescope(FAST), which would provide significant contribution to the current VLBI networks. In order to make use of the significant contribution of FAST to the VLBI observations, it is necessary to pick suitable VLBI research projects. We summarize their main VLBI projects of three mega radio telescopes with hundred-meter aperture 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 introduced. Future plans, including suitable VLBI networks to join, are discussed. Six suitable VLBI research projects are selected for FAST. The first VLBI fringe was achieved between FAST and Tianma telescope. VLBI networks, such as CVN, EVN, and LBA are suitable for FAST to contribute its significant sensitivity. Nearby small antenna could help FAST to join the phase referencing observations.

关 键 词：FAST VLBI 相位参考 

分 类 号：P164[天文地球—天文学]