195 citations · 466 across the 20 of their papers we have counts for
19 papers
Revisiting the X-ray Variability Plane of AGNs: The Significant Role of the Photon Index
Ruisong Xia, Hao Liu, Yongquan Xue +9
X-ray variability provides a powerful probe of the innermost regions of active galactic nuclei (AGNs), offering valuable insights into the accretion process and the structure of th…
Active Galactic Nuclei and STaR fOrmation in Nearby Galaxies AGNSTRONG. III. A Study on Ionized and Warm Molecular Gas Outflows of 6 Type-2 AGNs
Ruisong Xia, Chen Qin, Huynh Anh N. Le +5
Active galactic nucleus (AGN)-driven gas outflows are one of the best tracers of AGN feedback in action, as these powerful outflows expel/heat or compress the surrounding interstel…
A Tidal Disruption Event from an Intermediate-mass Black Hole Revealed by Comprehensive Multi-wavelength Observations
Jialai Wang, Mengqiu Huang, Yongquan Xue +12
Tidal disruption events (TDEs) occur when a star crosses the tidal radius of a black hole (BH) and is ripped apart, providing a powerful way to probe dormant BHs over a wide mass r…
Active Galactic Nuclei and STaR fOrmation in Nearby Galaxies (AGNSTRONG). II: Results for Jetted Type-I AGNs with Strong Ionized Gas Outflows
Chen Qin, Huynh Anh N. Le, Yongquan Xue +3
We investigate the correlation between ionized gas outflows, jets, and star formation in a sample of 42 local type-I active galactic nuclei (AGNs) exhibiting significant [O III] ou…
The Faintest, Extremely Variable X-ray Tidal Disruption Event from a Supermassive Black Hole Binary?
Mengqiu Huang, Yongquan Xue, Shuo Li +30
Tidal disruption events (TDEs), which occur when stars enter the tidal radii of supermassive black holes (SMBHs) and are subsequently torn apart by their tidal forces, represent in…
Baseline-Aware Dependence fitting for DAmping Timescales (BADDAT): A Nearly Unbiased Approach to Constraining Optical Variability Dependence on Physical Properties of Active Galactic Nuclei
Ruisong Xia, Zhen-Yi Cai, Yongquan Xue +7
Active galactic nuclei (AGNs) exhibit stochastic optical variability, commonly characterized by a damped random walk. The damping timescale is of particular interest because it is…
Investigating the Star-Formation Characteristics of Radio Active Galactic Nuclei
Bojun Zhang, Fan Zou, W. N. Brandt +5
The coevolution of supermassive black holes and their host galaxies represents a fundamental question in astrophysics. One approach to investigating this question involves comparin…
A Rapidly Accreting Active Galactic Nucleus Hidden in a Dust-Obscured Galaxy at
Nathan Cristello, Fan Zou, William N. Brandt +3
Dust-obscured galaxies (DOGs) containing central supermassive black holes (SMBHs) that are rapidly accreting (i.e., having high Eddington ratios, ) may represent a…
Active Galactic Nuclei and STaR fOrmation in Nearby Galaxies (AGNSTRONG). I. Sample and Strategy
Huynh Anh N. Le, Chen Qin, Yongquan Xue +4
We introduce our project, AGNSTRONG (Active Galactic Nuclei and STaR fOrmation in Nearby Galaxies). Our research goals encompass investigating the kinematic properties of ionized a…
The X-ray enhancements of radio-loud quasars at high redshift: New results at
Zihao Zuo, Shifu Zhu, W. N. Brandt +4
Highly radio-loud quasars (HRLQs; ) at show apparent enhanced X-ray emission compared to matched HRLQs at lower redshifts, perhaps due to a redshift-depend…
Radio AGN Selection and Characterization in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time
Shifu Zhu, William N. Brandt, Fan Zou +4
The Australia Telescope Large Area Survey (ATLAS) and the VLA survey in the XMM-LSS/VIDEO deep field provide deep ( Jybeam) and high-resolution ( 4.5…
The Most Obscured AGNs in the XMM-SERVS Fields
Wei Yan, W. N. Brandt, Fan Zou +9
We perform X-ray spectral analyses to derive characteristics (e.g., column density, X-ray luminosity) of 10,200 active galactic nuclei (AGNs) in the XMM-Spitzer Extragalac…
Spectral Energy Distributions in Three Deep-Drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties
Fan Zou, W. N. Brandt, Chien-Ting Chen +9
W-CDF-S, ELAIS-S1, and XMM-LSS will be three Deep-Drilling Fields (DDFs) of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), but their extensive multi-waveleng…
Fitting AGN/galaxy X-ray-to-radio SEDs with CIGALE and improvement of the code
Guang Yang, Médéric Boquien, William N. Brandt +11
Modern and future surveys effectively provide a panchromatic view for large numbers of extragalactic objects. Consistently modeling these multiwavelength survey data is a critical…
The X-ray spectral and variability properties of typical radio-loud quasars
Shifu Zhu, John Timlin, W. N. Brandt
We present X-ray spectral and long-term variability analyses of an unbiased sample of 361 optically selected radio-loud quasars (RLQs) utilizing sensitive serendipitous X-ray data…
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…
The -- relation and corona-disk-jet connection in optically selected radio-loud quasars
S. F. Zhu, W. N. Brandt, B. Luo +3
Radio-loud quasars (RLQs) are more X-ray luminous than predicted by the X-ray-optical/UV relation (i.e. ) for radio-quiet quasars (RQQs). The e…
Extremely rapid x-ray flares of tev blazars in the rxte era
S. F. Zhu, Y. Q. Xue, W. N. Brandt +2
Rapid flares from blazars in very high energy (VHE) -rays challenge the common understanding of jets of active galactic nuclei (AGNs). The same population of ultra-relativistic…
Deepest view of AGN X-ray variability with the 7 Ms Chandra Deep Field-South survey
X. C. Zheng, Y. Q. Xue, W. N. Brandt +13
We systematically analyze X-ray variability of active galactic nuclei (AGNs) in the 7~Ms \textit{Chandra} Deep Field-South survey. On the longest timescale ( years), we…