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25 papers · 1 filter
X-ray Quasi-Periodic Oscillations in Active Galactic Nuclei and Their Implications for the Changing Look Phenomenon
Mouyuan Sun, Shuying Zhou, Jihong Liu +12
X-ray timing of active galactic nuclei (AGN) provides a unique probe of gas accretion onto supermassive black holes (SMBHs). Quasi-periodic oscillations (QPOs), which trace gas dyn…
Exploring the central engines of gamma-ray bursts from prompt light curves
Xue Zhang, Shuang-Xi Yi, Wei-Hua Lei +6
Hyperaccreting stellar-mass black hole systems are leading candidates for the central engines of gamma-ray bursts (GRBs). Their jets are thought to be powered by either the Blandfo…
Analysis of Jet Dynamics and Collimation Characteristics of 0241+622 on Parsec Scales
Haitian Shang, Wei Zhao, Xiaoyu Hong +1
We conducted a detailed analysis of the jet structure and dynamics of the source 0241+622 on milliarcsecond (mas) scales. We stacked images from multiple epochs to better recover t…
Unveiling the Complex Jet Dynamics in the Blazar 2021+317 through Multi-Epoch VLBI Observations
Haitian Shang, Wei Zhao, Xiaoyu Hong +4
We present an investigation of the compact structure of the AGN 2021+317 based on multi-epoch Very Long Baseline Interferometry (VLBI) observations at 15, 22, and 43 GHz in the per…
Optical observations of the Galactic SNR HB9 and H II region G159.2+3.3
Jiang-Tao Li, Li-Yuan Lu, Huiyang Mao +4
Context. We present multi-wavelength observations of the Galactic SNR HB9 and the H II region G159.2+3.3 apparently projected nearby, in order to study their properties and potenti…
On the Hadronic Origin of High Energy Emission of -ray Loud Narrow-Line Seyfert 1 PKS 1502+036
Zhen-Jie Wang, Ze-Rui Wang, Ruo-Yu Liu +1
The radiation mechanism of Radio-Loud Narrow-Line Seyfert 1 (RL-NLS1) from X-ray to -ray bands remains an open question. While the leptonic model has been employed to explain th…