Long-term multi-wavelength variations of Fermi blazar 3C 279

作     者：Bing-Kai Zhang Min Jin Xiao-Yun Zhao Li Zhang Ben-Zhong Dai Bing-Kai Zhang;Min Jin;Xiao-Yun Zhao;Li Zhang;Ben-Zhong Dai

作者机构：Department of PhysicsFuyang Normal UniversityFuyang 236037China Key Laboratory of Functional Materials and Devices for Informatics of Anhui Higher Education InstitutesFuyang Normal UniversityFuyang 236037China Department of AstronomyYunnan UniversityKunming 650091China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2021年第21卷第8期

页      面：5-15页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：the support from National Natural Science Foundation of China (NSFC,Nos.U1831124 and 11273008) the Natural Science Foundation of Anhui Province of China (Grant No.1908085MA28) 

主　　题：galaxies:active BL Lacertae objects:general quasars:general quasars:individual(3C 279) 

摘      要：Long-term optical,X-ray and γ-ray data of blazar 3 C 279 have been compiled from Swift-XRT,RXTE-PCA,Fermi-LAT,SMARTS and *** source exhibits strong variability on long *** the 1980 s until now,the optical R band light curve spans more than 32 yr,and a possible 5.6-yr-long quasi-periodic variation component has been found in *** optical spectral behavior has been *** the optical band,the mean spectral index is –*** source exhibits an obvious special spectral *** the low state,the source manifests a clear bluer-when-brighter behavior in the sense that the optical spectrum turns harder(flatter) when the brightness *** in the high state,the optical spectrum is stable,which means the source spectral index does not vary with *** correlation analysis has been performed among optical,X-ray and γ-ray energy *** result indicates that the variations of γ-ray and X-ray bands are well correlated without time delay on the timescale of days,and their variations exhibit weak correlations with those of the optical *** variations,especially outbursts,are simultaneous,but the magnitude of variations is *** detailed analysis reveals that the main outbursts exhibit strong correlations in different γ-ray,X-ray and optical bands.