72 citations · 323 across the 10 of their papers we have counts for
12 papers · 1 filter
Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
Q. Ni, W. N. Brandt, B. Luo +8
We present deeper Chandra observations for weak-line quasars (WLQs) in a representative sample that previously had limited X-ray constraints, and perform X-ray photometric analyses…
Multi-epoch spectroscopy of Mg II broad absorption line transitions
Weimin Yi, John Timlin
Built upon a sample of 134 quasars that was dedicated to a systematic study of \mgii-BAL variability from Yi et al. (2019a), we investigate these quasars showing \mgii-BAL disappea…
On the Observational Difference Between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei
Hezhen Liu, B. Luo, W. N. Brandt +5
We present a systematic X-ray and multiwavelength study of a sample of 47 active galactic nuclei (AGNs) with reverberation-mapping measurements. This sample includes 21 super-Eddin…
Long-Timlescale X-ray Variability of BAL and Mini-BAL Quasars
John Timlin, W. N. Brandt, Shifu Zhu
We investigated the rest-frame 0.1-5 year X-ray variability properties of an unbiased and uniformly selected sample of 24 BAL and 35 mini-BAL quasars, making it the larges…
On the Fraction of X-ray Weak Quasars from the Sloan Digital Sky Survey
Xingting Pu, B. Luo, W. N. Brandt +4
We investigate systematically the X-ray emission from type 1 quasars using a sample of 1825 Sloan Digital Sky Survey (SDSS) non-broad absorption line (non-BAL) quasars with Chandra…
An Extreme X-ray Variability Event of a Weak-Line Quasar
Qingling Ni, W. N. Brandt, W. Yi +8
We report the discovery of an extreme X-ray flux rise (by a factor of > 20) of the weak-line quasar SDSS J153913.47+395423.4 (hereafter SDSS J1539+3954) at z = 1.935. SDSS J1539+39…