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

被引：5

作者：

Liu, Hao ^{[1
]}

Wu, Qing-Wen ^{[1
]}

Xue, Yong-Quan ^{[2
,3
]}

Wang, Ting-Gui ^{[2
,3
]}

Yang, Jun ^{[4
]}

Guo, Heng-Xiao ^{[5
]}

He, Zhi-Cheng ^{[2
,3
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Phys, Dept Astron, Wuhan 430074, Peoples R China

[2] Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China

[3] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China

[4] Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden

[5] Univ Calif Irvine, Dept Phys & Astron, 4129 Frederick Reines Hall, Irvine, CA 92697 USA

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2021年 / 21卷 / 08期

基金：

中国国家自然科学基金;

关键词：

galaxies; active; Seyfert; quasars; emission lines; accretion; accretion disks; ACTIVE GALACTIC NUCLEI; SUPERMASSIVE BLACK-HOLE; ACCRETION DISK WIND; XMM-NEWTON; VARIABILITY; OUTFLOWS; CORONA; LINE; LUMINOSITY; QUASARS;

D O I：

10.1088/1674-4527/21/8/199

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

X-ray changing-look active galactic nuclei (CL AGNs) are a subpopulation of AGNs, whose line-of-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 NuSTAR 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.

引用

页数：8

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