42 citations · 338 across the 20 of their papers we have counts for
19 papers · 1 filter
Jet Power, Bulk Lorentz Factor, Black Hole Spin, and Magnetic Field of Accretion Disk in Jetted Active Galactic Nuclei: A Large Gamma-Ray Emission Sample
Dingrong Xiong, Junhui Fan, Feng Yuan +14
We present a catalog of physical parameters for powerful jet-accretion disk-black hole systems in one of the largest samples of gamma-ray emitting jetted active galactic nuclei (AG…
Photon-ALP beam propagation from Mrk 501
L. J. Dong, Y. G. Zheng, S. J. Kang +1
The very high energy (VHE, E ) -ray observations offer a possibility of indirectly detecting the presence of axion-like particles (ALPs). The paper focuse…
The Energy Budget in the Jet of High-frequency Peaked BL Lacertae Objects
X. Z. Zhao, H. Y. Yang, Y. G. Zheng +1
Energy equipartition and the energy budget in the jet are import issues for the radiation mechanism of blazars. Early work predominantly concentrated on flat-spectrum radio quasars…
The Fermi-LAT view of the changing-look blazar OQ 334
S. S. Ren, R. X. Zhou, Y. G. Zheng +2
Context.Unusually, there are still certain characteristics of the changing-look (CL) active galactic nuclei (AGNs) that remain undetected.Consequently,the trigger mechanism behind…
Classifications of Fermi-LAT unassociated sources in multiple machine learning methods
K. R. Zhu, J. M. Chen, Y. G. Zheng +1
The classifications of Fermi-LAT unassociated sources are studied using multiple machine learning (ML) methods. The update data from 4FGL-DR3 are divided into high Galactic latitud…
Propagation of very-high-energy -rays from distant blazars
L. J. Dong, Y. G. Zheng, S. J. Kang
We re-derive the possible dependence of the redshift with very high energy (VHE) -ray photon index. The results suggest that the universe to VHE -rays is becoming more transp…
Expected Signature For the Lorentz Invariance Violation Effects on Absorption
Y. G. Zheng, S. J. Kang, K. R. Zhu +2
There are still some {significant and} unanswered questions about the {incredible} {very high energy (VHE)} -ray signatures. To help understand the mechanism, focusing on the li…
A time-dependent particle acceleration and emission model: Understanding the particle spectral evolution and blazar flares
Y. G. Zheng, S. J. Kang, C. Y. Yang +1
The jets of blazars are renowned for their multi-wavelength flares and rapid extreme variability; however, there are still some important unanswered questions about the physical pr…
Establishing a particle distribution for multi-wavelength emission from BL Lac objects
X. X. Xie, K. R. Zhu, S. J. Kang +1
Electrons are accelerated at the shock wave diffuse and advect outward, and subsequently drift away into the emitting region of the jet that is located in the downstream flow from…
Formation of the Electronic Spectrum in Relativistic Jets of Gamma-Ray Blazars
Y. G. Zheng, G. B. Long, C. Y. Yang +1
We describe the theory of Fermi-type acceleration, including first-order Fermi acceleration at a parallel shock front and second-order Fermi acceleration in a test particle limit.…
Verification of the diffusive shock acceleration in Mrk 501
Y. G. Zheng, G. B. Long, C. Y. Yang +1
The present work considers a plane shock front propagating along a cylindrical jet. Electrons experience the diffusive shock acceleration around the shock front, and subsequently d…
Discerning the -ray emitting region in the flat spectrum radio quasars
Y. G. Zheng, C. Y. Yang, L. Zhang +1
A model-dependent method is proposed to determine the location of the -ray emitting region for a given flat spectrum radio quasar (FSRQ). In the model, the extra-relativistic el…
Evidence for the Secondary Emission as the Origin of Hard Spectra in TeV Blazars
Y. G. Zheng, T. Kang
We develop a model for a possible origin of hard very high energy spectra from a distant blazar. In the model, both the primary photons produced in the source and secondary photons…
Rapid TeV Flaring in Markarian 501
Y. G. Zheng, L. Zhang
We investigate rapid TeV flaring in markarian 501 in the frame of a time-dependent one-zone synchrotron self-Compton (SSC) model. Inthis model, electrons are accelerated to extra-r…
X-ray and gamma-ray variability of Mrk 421
Y. G. Zheng, S. J. Kang, J. Li
We present an ordinary case in the momentum diffusion equation for the electron spectrum evolution and investigate the energy spectra and time dependent properties of flare in Mrk…
Modelling the -ray variability of 3C 273
Y. G. Zheng, L. Zhang, B. R. Huang +1
We investigate MeV-GeV -ray outbursts in 3C 273 in the frame of a time-dependent one-zone synchrotron self-Compton (SSC) model. In this model, electrons are accelerated to extra…
Modelling the multi-wavelength emission of flat spectrum radio quasar 3C 279
Y. G. Zheng, C. Y. Yang
We employ a length-dependent conical jet model for the jet structure and emission properties of flat spectrum radio quasar 3C 279 in the steady state. In the model, ultra-relativis…
Bethe-Heitler cascades as a plausible origin of hard spectra in distant TeV blazars
Y. G. Zheng, C. Y. Yang, S. J. Kang
Context. Very high-energy (VHE) -ray measurements of distant TeV blazars can be nicely explained by TeV spectra induced by ultra high-energy cosmic rays. Aims. We develop a mode…
Variability and spectral variation of 3C 66A
Shao Ming Hu, Jianghua Wu, H. Y. Guo +3
3C 66A was monitored by the BATC(Beijing-Arizona-Taipei-Connecticut) telescope from 2005 to 2008,1994 observations were obtained on 89 nights. Detailed research and analysis was pe…