摘要
OQ208愈来愈多地被用作为VLBI流量密度校准源.本文首次提供该源在5 GHz频率上的VLBI图像.OQ208的结构是由一个致密核和一个子源所组成.子源与核之间的距离约为7毫角秒,位置角为—125度.从原则上讲,OQ208并不是一个理想的VLBI流量校准源.如果要用它作为校准源,则必须消除因其结构所产生的影响.本文提供了作改正的结构信息.
OQ208 is used more and more frequently as a VLBI calibrator of flux density. A 5-GHz VLBI image of OQ208 is firstly provided in this paper. Its structure consists of a compact core and a component. The angular distance between the core and the component is about seven milli-arcsecond; the position angle is -125 degrees. In principle, OQ208 is not an ideal VLBI calibrator of flux density. This paper provides the structural information for correction of the structure effect when OQ208 is used as a calibrator.
出处
《天文学报》
CSCD
北大核心
1993年第1期12-16,共5页
Acta Astronomica Sinica
基金
国家自然科学基金
