Radio variability for OJ287 and 3C279  

作　　者：YUAN YuHai 

机构地区：[1]Center for Astrophysics,Guangzhou University,Guangzhou 510006,China [2]Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,Guangzhou 510006,China [3]Center for Astrophysics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第4期717-722,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10633010);the National Basic Research Program of China (Grant No. 2007CB815405);the Bureau of Education of Guangzhou Municipality (Grant No. 11 Sui-Jiao-Ke[2009]),and GDUPS (2009);supported by the University of Michigan and the National Science Foundation

摘　　要：Based on the new data from the database of the University of Michigan Radio Astronomy Observatory （UMRAO）, we analyze the spectral index and optical variability of OJ287 and 3C279. The main results show that 1） the time delay among three radio bands （4.8, 8, and 14.5 GHz） shows： r8-14.5 = 31 d, r4.8-8 = 41 d for OJ287, but no time delay lying in 3C279; 2） strong correlation lies in the polarization and flux density at 8 GHz for OJ287 and at 8, 14.5 GHz for 3C279; 3） the logarithmic brightness temperature log（TB） = 14.l K for OJ287 is 14.1 K, log（TB） = 15.1 K for 3C279.Based on the new data from the database of the University of Michigan Radio Astronomy Observatory(UMRAO),we analyze the spectral index and optical variability of OJ287 and 3C279.The main results show that 1) the time delay among three radio bands(4.8,8,and 14.5 GHz) shows:τ 8 14.5 = 31 d,τ 4.8 8 = 41 d for OJ287,but no time delay lying in 3C279;2) strong correlation lies in the polarization and flux density at 8 GHz for OJ287 and at 8,14.5 GHz for 3C279;3) the logarithmic brightness temperature log(TB) = 14.1 K for OJ287 is 14.1 K,log(TB) = 15.1 K for 3C279.

关 键 词：GALAXIES blazers BL Lacs OJ287 3C279 

分 类 号：P16[天文地球—天文学]