22 citations · 56 across the 9 of their papers we have counts for
8 papers
Radial gradients revealed by mutliscale outflows from down-the-barrel spectroscopy toward a quasar at redshift 3.4
Weimin Yi, Paola Rodriguez Hidalgo, Chen Chen +9
Active galactic nucleus(AGN) feedback is a key ingredient in galaxy formation models and simulations. From an observational point of view, however, the channels of AGN feedback cou…
Systematic Monitoring of Extreme X-ray Variability from Weak-line Quasars
Madison Reich, W. N. Brandt, Bin Luo +5
We present the results of a multi-cycle Chandra program to systematically monitor the X-ray variability of 10 weak-line quasars (WLQs) that previously had limited multi-epoch X-ray…
Supermassive Black Hole and Broad-line Region in NGC 5548: 2023 Reverberation Mapping Results
Wen-Zhe Xi, Kai-Xing Lu, Jin-Ming Bai +6
We present the results of the 2023 spectroscopic reverberation mapping (RM) campaign for active galactic nuclei (AGN) of NGC 5548, continuing our long-term monitoring program. Usin…
Tracking Outflow using Line-Locking (TOLL). II. Large Line-Locking Web identified in Quasar J151352+085555
Chen Chen, Zhicheng He, Weimin Yi +3
Quasar outflows often consist of two clouds with velocity separations matching the doublet spacings of common UV resonance transitions, a phenomenon known as line-locking, which is…
Tracking Outflow using Line-Locking (TOLL). I. The case study of Quasar J221531-174408
Chen Chen, Weimin Yi, Zhicheng He +2
Investigating line-locked phenomena within quasars is crucial for understanding the dynamics of quasar outflows, the role of radiation pressure in astrophysical flows, and the star…
Quasar winds caught on acceleration and deceleration
Weimin Yi, P. B. Hall, Zunlin Yuan +5
We present an observational study of wind acceleration based on four low-ionization broad absorption line (LoBAL) quasars (J0136, J1238, J1259, J1344). J0136 and J1344 (group-1) ar…
Variability of Low-ionization Broad Absorption Line Quasars Based on Multi-epoch Spectra from The Sloan Digital Sky Survey
Weimin. Yi, W. N. Brandt, P. B. Hall +5
We present absorption variability results for 134 bona fide \mgii\ broad absorption line (BAL) quasars at 0.46~~2.3 covering days to 10 yr in the rest f…
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…