28 citations · 62 across the 12 of their papers we have counts for
9 papers · 1 filter
Accretion-Mode Transition: The Driver Behind Spectral Changes in Changing-Look AGNs
Pengyuan Han, Huaiyuan Lu, Bing Lyu +2
The physical origin of optical changing-look AGNs (CLAGNs), characterized by the appearance or disappearance of broad emission lines, is thought to be mainly driven by the variatio…
Composite spectrum of Little Red Dot from a standard inner disk and an unstable outer disk
Chenxuan Zhang, Qingwen Wu, Xiao Fan +6
James Webb Space Telescope (JWST) has revealed a new class of high-redshift, very red, compact broad-line sources, termed as "little red dots" (LRDs). The physical mechanism drivin…
The NuSTAR view of five changing-look active galactic nuclei
Bing Lyu, Zhen Yan, Xue-bing Wu +3
Changing-look active galactic nuclei (CLAGNs) are known to change their spectral type between 1 and 2 (changing-state) or change their absorption between Compton-thick and Compton-…
The changing-look AGN SDSS J101152.98+544206.4 is returning to a type I state
Bing Lyu, Xue-Bing Wu, Yuxuan Pang +11
Aims. We reported the discovery that a changing-look AGN SDSS J101152.98+544206.4 (J1011+5442 for short) gradually returns to the type 1 state after a short period between 2014 and…
The Physical Properties of Changing-look Blazars
Shi-Ju Kang, Bing Lyu, Qingwen Wu +2
Changing-look active galactic nuclei (AGNs) are a special class of AGNs that change their spectral type from type 1 to type 2 or vice versa. In recent years, a number of changing-l…
The weakness of soft X-ray intensity: possible physical reason for weak line quasars
Jiancheng Wu, Qingwen Wu, Chichuan Jin +8
Weak-line quasars (WLQs) are a notable group of active galactic nuclei (AGNs) that show unusually weak UV lines even though their optical-UV continuum shapes are similar to those o…
A new variability pattern in GRS 1915+105 with NICER and Insight-HXMT observations
Zhihong Shi, Qingwen Wu, Zhen Yan +2
We explore the timing and spectral properties of GRS 1915+105 based on X-ray observations of NICER and Insight-HXMT during the long outburst from 2017 to 2021. We find a new class…
Coevolution of broad emission lines and X-ray spectrum in changing-look AGNs
Hao Liu, Qingwen Wu, Bing Lyu
Changing-look active galactic nuclei (CLAGNs) show the disappearance and reappearance of broad emission lines in a few years, which challenges the orientation-based AGN unification…
Long-term and multi-wavelength evolution of a changing-look AGN Mrk 1018
Bing Lyu, Zhen Yan, Wenfei Yu +1
The physical mechanism for triggering the changing-look phenomenon in active galactic nuclei (AGNs) is still unclear. We explore this issue based on the multi-wavelength spectral a…