PKS 1510-089的光变特性和色指数研究  

Optical Variability and the Color Index Variation of PKS 1510-089

作　　者：杨海燕 刘志蝶 党兴菊 木繁[3] 李孝攀 杜国芳 艾鹏 YANG Hai-yan;LIU Zhi-die;DANG Xing-ju;MU Fan;LI Xiao-pan;DU Guo-fang;AI Peng(School of Physics and Information Engineering, Zhaotong University, Zhaotong 657000, China;School of Mathematics and Physics, Taizhou University, Taizhou 225300, China;Oxbridge College, Kunming University of Science and Technology, Kunming 650106, China)

机构地区：[1]昭通学院物理与信息工程学院,云南昭通657000 [2]泰州学院数理学院,江苏泰州225300 [3]昆明理工大学津桥学院,云南昆明650106

出　　处：《云南师范大学学报（自然科学版）》2018年第2期1-5,共5页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：云南省教育厅科研基金资助项目(2016ZZX230;2017ZZX079)

摘　　要：通过对Swift卫星UVOT望远镜的准同时观测数据进行处理,得到了PKS 1510-089从2006年8月4日到2017年6月25日的光学U、B、V波段光变曲线.分析色指数变化,得出其长期光变和短期爆发的颜色变化与光变之间表现出显著的相关性,当目标变亮时,其色指数变大(谱变红);当目标变蓝时,色指数变小(谱变蓝),该现象可以通过激波喷流模型来解释.DCF方法分析结果发现光学各波段具有很强的相关性,且无明显时间延迟.色指数与流量变化的DCF分析呈负相关.We report on the multiwavelength light curves of the blazar PKS 1510-089 in the optical U,B and V bands on the basis of the simultaneous observations obtained from the Swift/UVOT telescope during the period from August 4,2006 to June 25,2017.A significant correlation between color index and flux density can be confirmed in the long-term and short-term timescales,namely the spectra got redder when the source tended to be brighter and got bluer when the source became fainter,which could be explained by the shock-in-jet models.Furthermore,the discrete correlation function（DCF）analysis reveals an existence of a significant correlation among these optical bands with no time delays,and a negative correlation between color index and flux density.

关 键 词：PKS 1510-089 色指数 DCF方法 相关性 时间延迟 

分 类 号：P157.6[天文地球—天文学]