67 citations · 222 across the 11 of their papers we have counts for
11 papers
Mrk 382: A Narrow-line Seyfert 1 Galaxy with Recurrent X-ray State Transitions
Yanli Ai, Wenfeng Wen, Liming Dou +10
We report recurrent X-ray state transitions in the nearby narrow-line Seyfert~1 galaxy Mrk~382 using multi-epoch observations from \textit{Swift}, \textit{Chandra}, \textit{XMM-New…
X-ray variability of SDSS J000532.84+200717.4: from a normal state to an X-weak state
Xiaohui Yang, Yanli Ai, Liming Dou +8
We present a multi-epoch study of the extreme X-ray variability of the type~1 quasar SDSS~J000532.84+200717.4 using archival observations from \textit{XMM-Newton}, \textit{Swift}/X…
Broad absorption line disappearance/emergence in multiple ions in a weak emission-line quasar
Weimin Yi, M. Vivek, W. N. Brandt +9
We report the discovery of disappearance of Mg ii, Al iii, C iv, and Si iv broad absorption lines (BALs) at the same velocity, accompanied by a new Civ BAL emerging at a higher vel…
A long decay of X-ray flux and spectral evolution in the supersoft active galactic nucleus GSN 069
X. W. Shu, S. S. Wang, L. M. Dou +3
GSN 069 is an optically identified very low-mass AGN which shows supersoft X-ray emission. The source is known to exhibit huge X-ray outburst, with flux increased by more than a fa…
Central Engine and Host Galaxy of RXJ 1301.9+2747: A Multiwavelength View of a Low-mass Black Hole Active Galactic Nuclei with Ultra-soft X-ray Emission
Xinwen Shu, Tinggui Wang, Ning Jiang +3
RXJ 1301.9+2747 is an optically identified very low mass AGN candidate with M_BH~1x10^6M_sun, which shows extremely soft X-ray emission and unusual X-ray variability in the form of…
On the fraction of X-ray obscured quasars
Junxian Wang, Peng Jiang, Zhenya Zheng +2
Various studies have claimed that the fraction of obscured AGN drops with luminosity, but contrary results are also reported. We present our recent studies on the fraction of X-ray…
On the fraction of X-ray obscured quasars in the local universe
J. X. Wang, P. Jiang
Recent wide area hard X-ray and soft Gamma ray surveys have shown that the fraction of X-ray obscured AGNs in the local universe significantly decreases with intrinsic luminosity.…
A Rapid X-ray Flare in the Radio-loud Narrow Line Quasar PKS 0558-504
T. G. Wang, M. Matsuoka, T. Kubo +2
We report the detection of a very short time scale flare in the radio-loud narrow line quasars PKS 0558-504 by using ASCA. The X-ray count rates increased and decreased by a factor…
Evidence of thick obscuring matter revealed in the X-ray spectrum of the Z=4.28 quasar RXJ1028.6-0844
W. Yuan, M. Matsuoka, T. Wang +3
We report the discovery of an unambiguous, substantial low-energy cutoff in the broad band X-ray spectrum of the radio quasar RXJ1028.6-0844 at a redshift of 4.276 obtained with th…
How Saturated are Absorption Lines in the Broad Absorption Line Quasar PG 1411+442 ?
T. G. Wang, J. X. Wang, W. Brinkmann +1
Recently, convincing evidence was found for extremely large X-ray absorption by column densities in broad absorption line quasars. One consequence of this is th…
Broad Band X-Ray Observations of the Narrow Line X-Ray Galaxy NGC 5506
T. G. Wang, T. Mihara, C. Otani +2
We present a detailed analysis of broad band X-ray data of the Seyfert 2 galaxy NGC5506. 2-10 keV band are detected during a 1-day ASCA observation, while no significant change in…