高频VLBI观测射电源的结构  

VLBI Structures of Extragalactic Radio Sources at High Frequencies

作　　者：田文武[1] 吴盛殷[1] 张海燕[2] 

机构地区：[1]中国科学院北京天文台 [2]北京师范大学天文系,北京100875

出　　处：《云南天文台台刊》2001年第2期1-9,共9页Publications of the Yunnan Observatoty

基　　金：国家自然科学基金!( 1 99730 1 0 )资助项目

摘　　要：高频VLBI观测揭示出河外射电源在pc或者亚pc尺度上大都有核 -喷流的内部结构。尤其是对平谱致密射电源中毫角秒尺度的子源 ,能以相当高的概率观测到它的视超光速现象。多频观测可监测到一些新喷流子源的出现 ,特别在射电激变源中这些新喷流子源的出现与宽带内 (从光学到γ射线 )的爆发相关。且得到的一些源的核区谱指数分布 。VLBI observations at high frequencies show that most of extragalactic radio sources have a nucleus-jet structure on pc or sub-pc scales.Especially for flat-spectrum compact radio sources,the milli-arcsecond components with apparent superluminal velocity are detected with high probability.Multi-frequency observations monitor the new jet component production.Especially for radio OVV,the jet components have a tight relation with correlated broad-band (from optical to γ-ray) flux outbursts.The spectrum index distribution in some radio sources has been obtained,which makes it possible to identify the VLBI cores of these sources.

关 键 词：高频VLBI观测 射电源结构 干涉测量 喷流 视超光速现象 

分 类 号：P157.7[天文地球—天文学] P164