致密对称源OQ208自行的研究

Research on the Proper Motion in CSO OQ208

利用美国甚长基线阵,在5GHz和8GHz波段观测致密对称源(CSO)OQ208,由获得的总流量图均显示OQ208是由2个主要的射电结构组成。5GHz波段在该源西南(SW)部分和东北(NE)部分都探测到2个子源。8GHz波段在该源(SW)部分探测到2个子源,而在(NE)部分探测到3个子源。在5GHz波段,根据子源A和D自1993年到2001年间的5个时段VLBI观测成图结果,拟合出它们的分离速度为0.037±0.006mas/a(年)。在8GHz波段,根据1994年到2002年间的9个时段观测数据,获得子源A和C的分离速度为0.046±0.009mas/a。

The compact symmetric object （CSO） OQ208 was observed with Very Long Baseline Army （VLBA） at 5GHz and 8GHz bands. The obtained total intensity images show that OQ208 consists of a southwestern and a northeast structures. Both of them are resolved into two components at 5GHz, while one more component is detected in the northeast region at 8GHz band. Analyzing images at 5GHz band taken in 5 epochs from 1993 to 2001, an estimate of separation velocity 0.037 ± 0.006mas/a（year） is derived as the relative motions of components A and D . Moreover, on the basis of the images in 9 epochs from 1 9 9 4 to 2 0 0 2 , the proper motion 0.0 4 6 ± 0.009mas/a of component C moving away from component A at 8GHz band is also found.