天文学进展Issue(4)：509-518,10.DOI:10.3969/j.issn.1000-8349.2013.04.08
Mrk 421和3C 454.3的射电与γ射线波段的光变研究
The Variability Analysis of Radio andγ-Ray Fluxes for Mrk 421 and 3C 454.3
摘要
Abstract
In this paper, the variabilities of Mrk 421 and 3C 454.3 are analyzed in detail. We collect the data inγ-ray (100 MeV∼300 GeV) and radio (15 GHz) bands, and construct their light curves. Through analysis, we find that there is a strong correlation betweenγ-ray and radio fluxes, in which the variation in theγ-ray band leads that in radio band for two sources. The most likely explanation of the observed time lag is synchrotron opacity in the radiation region which could be optically thick to radio emission when the flares occur. Caused by the same perturbation, the radio andγ-ray flares at their peaks are not observed simultaneously due to the opacity effect. The radio flare is observed only when the emission region becomes optically thin. We also find a long time fall in the light curve of 3C 454.3 in radio band after a big outburst. In the same time, theγ-ray flux is very faint, indicating the weakness of the activity of the jet. We consider that the fall could correspond to an expanding process of the radiation region.关键词
耀变体/Mrk 421/3C 454.3/光变研究Key words
Blazar/Mrk 421/3C 454.3/variability分类
天文与地球科学引用本文复制引用
顾春霞,周明,王建成..Mrk 421和3C 454.3的射电与γ射线波段的光变研究[J].天文学进展,2013,(4):509-518,10.基金项目
国家自然科学基金(11133006,11173054)；973项目(2009CB824800)；中国科学院政策研究项目(KJCX2-YW-T24) （11133006,11173054）
