Colloquium on Feb. 16, 2023

The multiband variability of changing-look AGNs and hint for physical mechanism

Speaker: Qingwen Wu (HUST)

Venue: SWIFAR Building 2111

Time: 14:00 PM, Thursday, Feb. 16, 2023

Abstract:

Changing-look active galactic nuclei (CLAGNs) are a subset of AGNs in which the broad emission lines appear/disappear or show strong variation of line-of-sight column densities within a few years, which challenges the widely-adopted orientation-based AGN unification model. We analyze the properties of the multiband variabilities, emission lines and variation of energy spectrum for both single CLAGN and CLAGN sample. We propose a physical mechanism for the  phenomena of the changing-look. More multiband observations will further shed light on the intrinsic physical mechanism of CLAGNs and possible galaxy evolution.