7 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…
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…
First Evidence for a QPO Triplet and Its Relativistic Precession Origin in RE J1034+396
Ruisong Xia, Yongquan Xue, Jialai Wang +1
Quasiperiodic oscillations (QPOs) in active galactic nuclei (AGNs) provide a powerful tool for probing the structure of the innermost accretion flow and corona around supermassive…
Strong Amplitude Modulation of Hard-band X-ray QPO with Soft-band Flux in RE J1034+396
Ruisong Xia, Hao Liu, Yongquan Xue
The X-ray quasi-periodic oscillation (QPO) is a remarkable form of variability in systems of compact object accretion. RE J1034+396, harboring the most significant X-ray QPO in act…
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…
First Observational Evidence for an Interconnected Evolution between Time Lag and QPO Frequency among AGNs
Ruisong Xia, Hao Liu, Yongquan Xue
Quasi-periodic oscillations (QPOs) have been widely observed in black hole X-ray binaries (BHBs), which often exhibit significant X-ray variations. Extensive research has explored…