OJ287天体的射电结构研究

The Radio Structure of BL Lac Object OJ287

OJ287是一个典型的BL Lac型天体,研究该天体对于理解BL Lac型天体有非常重要的意义。为了研究OJ287天体的射电结构、亮温度等性质,本文搜集有关该天体的甚长基线射电望远镜阵(VLBA) 2 cm观测数据(1995—2018年),并把这些观测数据分别单个导入DIFMAP程序软件进行成图和分量处理、拟合,得到以下结果:OJ287天体在VLBA 2 cm波段的喷流方向(单侧的且方向向右),该天体的总流量,该天体的喷流各模型成分的流量、大小、方位角,喷流各模型成分离核心的距离,以及该天体的射电亮温度(1011.8"1015.0K)。由此可知,OJ287是一个高光度且光度变化非常快的天体,其喷流结构相当复杂。

OJ287 was identified as a typical BL Lac object. It is significant for better understanding BL Lac objects to study this object. In order to study the radio structure,brightness temperature and other properties of OJ287 object,Very Long Baseline Array( VLBA) 2 cm observation data( 1995—2018) on the object were collected,and the data were imported into the DIFMAP package to make images and fit the object. Through work above,the following results could be obtained: the jet’s direction( one-sided and right) of the OJ287 object in the VLBA 2 cm band;the combined flux of the object;the flux,size and position angel of each model component of the object;the distance of each model component of the jet from core;and the radio brightness temperature of the object( 1011.8~ 1015.0 K). It can be seen that OJ287 is a celestial body with high luminosity and rapid luminosity change,and its jet structure is considerably complicated.