X-ray spectral evolution in an X-ray changing-look AGN NGC 1365 with variable column density
Journal article, 2021

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.

quasars

emission lines

active

galaxies

galaxies

Seyfert

accretion disks

accretion

Author

Hao Liu

Huazhong University of Science and Technology

Qing-Wen Wu

Huazhong University of Science and Technology

Yong-Quan Xue

University of Science and Technology of China

Ting-Gui Wang

University of Science and Technology of China

Jun Yang

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Observation Support

Heng-Xiao Guo

University of California at Irvine (UCI)

Zhi-Cheng He

University of Science and Technology of China

Research in Astronomy and Astrophysics

1674-4527 (ISSN)

Vol. 21 8 199

Subject Categories

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

Condensed Matter Physics

DOI

10.1088/1674-4527/21/8/199

More information

Latest update

11/16/2021