65 citations · 713 across the 40 of their papers we have counts for
5 papers · 1 filter
The Curious Case of PHL 1811: Heavy Obscuration Versus Intrinsic X-ray Weakness
B. Luo, Xiaolei Chen, Jian Huang +2
We present a systematic X-ray analysis of the narrow-line Type 1 quasar PHL 1811, which has long been regarded as the prototype of intrinsically X-ray weak quasars. A critical brea…
The Remarkable X-ray Spectra and Variability of the Ultraluminous Weak-Line Quasar SDSS J1521+5202
Shouyi Wang, W. Niel Brandt, Bin Luo +4
We present a focused X-ray and multiwavelength study of the ultraluminous weak-line quasar (WLQ) SDSS J1521+5202, one of the few X-ray weak WLQs that is amenable to basic X-ray spe…
Strong and Rapid X-ray Variability of the Super-Eddington Accreting Quasar SDSS J081456.10+532533.5
Jian Huang, Bin Luo, W. N. Brandt +6
We report strong and rapid X-ray variability found from the super-Eddington accreting quasar SDSS J081456.10+532533.5 at . It has a black-hole mass of $2.7\times10^{7}{M_…
The frequency of extreme X-ray variability of radio-quiet quasars
John D. Timlin, W. Niel Brandt, Shifu Zhu +3
We analyze 1598 serendipitous Chandra X-ray observations of 462 radio-quiet quasars to constrain the frequency of extreme amplitude X-ray variability that is intrinsic to the quasa…
Multi-epoch analysis of the X-ray spectrum of the active galactic nucleus in NGC 5506
Shangyu Sun, Matteo Guainazzi, Qingling Ni +5
We present a multi-epoch X-ray spectroscopy analysis of the nearby narrow-line Seyfert I galaxy NGC 5506. For the first time, spectra taken by Chandra, XMM-Newton, Suzaku, and NuST…