X-ray spectral evolution in an X-ray changing-look AGN NGC 1365 with variable column density  

作　　者：Hao Liu Qing-Wen Wu Yong-Quan Xue Ting-Gui Wang Jun Yang Heng-Xiao Guo Zhi-Cheng He 

机构地区：[1]Department of Astronomy,School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]CAS Key Laboratory for Research in Galaxies and Cosmology,Department of Astronomy,University of Science and Technology of China,Hefei 230026,China [3]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [4]Department of Space,Earth and Environment,Chalmers University of Technology,Onsala Space Observatory,SE-43992 Onsala,Sweden [5]Department of Physics and Astronomy,4129 Frederick Reines Hall,University of California,Irvine,CA,92697-4575,USA

出　　处：《Research in Astronomy and Astrophysics》2021年第8期159-166,共8页天文和天体物理学研究（英文版）

基　　金：support from the National Natural Science Foundation of China (NSFC,Grant No.U1931203);support from NSFC (Grant Nos.12025303,11890693 and 11421303);the CAS Frontier Science Key Research Program (QYZDJ-SSWSLH006);the K.C.Wong Education Foundation.Z.C.He is supported by NSFC (Grant No.11903031);USTC Research Funds of the Double First-Class Initiative YD 3440002001;supported by NSF grant AST1907290。

摘　　要：X-ray changing-look active galactic nuclei(CL AGNs) are a subpopulation of AGNs,whose lineof-sight column densities increase/decrease within several years.The physical mechanism for the variation of column density is unclear.We reduce the X-ray data from XMM-Newton and Nu STAR observations for a CL AGN NGC 1365 with strong variation of column densities.The X-ray spectrum quickly softens as the X-ray luminosity increases and optical-to-X-ray spectral index also increases as increasing of optical luminosity.These results support that NGC 1365 also undergoes strong spectral evolution as that recently suggested for the optically selected CL AGNs with reappearance/disappearance of broad emission lines.Therefore,the variation of column density may be driven by the variable disk winds during the strong evolution of disk/corona.

关 键 词：galaxies:active galaxies:Seyfert quasars:emission lines accretion accretion disks 

分 类 号：P15[天文地球—天文学]