25 citations · 25 across the 9 of their papers we have counts for
10 papers
Gaussian Process Inference of Stochastic Magneto-Active Dynamics and Viscosity in Swift J1727.8-1613
Lijuan Dong, Dahai Yan, Zihan Yang +4
Linking X-ray variability to the underlying magnetohydrodynamic (MHD) dynamics of black hole X-ray binaries remains challenging. We systematically investigate the stochastic and os…
Gaussian process analysis of type-B quasiperiodic oscillations in the black hole X-ray binary MAXI J1348-630
Yiran Wang, Ruican Ma, Haiyun Zhang +1
We analyzed Insight-HXMT data of the black hole X-ray binary MAXI J1348-630 during the type-B QPO phase of its 2019 outburst. Using the Gaussian process method, we applied an addit…
Gaussian Process Modeling Coronal X-ray Variability of Active Galactic Nuclei
Haiyun Zhang, Dahai Yan, Li Zhang +1
The corona is an integral component of active galactic nuclei (AGNs) which can produce the X-ray emission. However, many of its physical properties and the mechanisms powering this…
A characteristic optical variability time scale in jetted active galactic nuclei: a large gamma-ray emission sample
Dingrong Xiong, Mouyuan Sun, Jun-Xian Wang +14
The variability mechanisms from jetted AGNs are still under debate. Here the damped random walk (DRW) model, implemented through Gaussian Processe (GPs), is used to fit the l…
Patterns of X-ray and -ray Flares: from Blazar to Maganetar and Sun
Haiyun Zhang, Dahai Yan, Lijuan Dong +6
Using Gaussian process methods, we analyzed the light curves of three extreme solar X-ray flares observed by the RHESSI satellite. Their variability characteristics were then compa…
Pattern and Origin for the Extreme -ray Flares of 3C 454.3 and 3C 279: An Astrophysical Critical Damper?
Haiyun Zhang, Dahai Yan, Jianeng Zhou +2
We apply a Gaussian process method to the extreme -ray flares of 3C 454.3 and 3C 279 to discover the variable patterns and then to investigate the physical origins of the giant…
Detection of the cosmological evolution of the Doppler factor for blazars jets
Dahai Yan, Haiyun Zhang, Jianeng Zhou +1
The Doppler factor () is a fundamental quality for the relativistic jets from active galactic nuclei (AGNs). It is also fundamental to assessing the number of the entire populat…
Evidence for Magneto-gravitational Processes in Supermassive Black Hole Binary PG 1553+113
Haiyun Zhang, Dahai Yan, Li Zhang +1
PG1553+113 has drawn significant attention for its quasi-periodic oscillation (QPO) in gamma-ray variability, though the origin of its variability remains uncertain. In this study,…
Insights from the Gaussian Processes Method for the FRB-associated X-ray Burst of SGR 1935+2154
Ruijing Tang, Dahai Yan, Haiyun Zhang +7
Gaussian processes method is employed to analyze the light curves of bursts detected by Insight-HXMT, NICER, and GECAM from SGR 1935+2154 between 2020 to 2022. It is found that a s…
Gaussian Process Modeling Blazar Multiwavelength Variability: Indirectly Resolving Jet Structure
Haiyun Zhang, Dahai Yan, Li Zhang
Blazar jet structure can be indirectly resolved by analyzing the multiwavelength variability. In this work, we analyze the long-term variability of blazars in radio, optical and X-…