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15 papers · 2 filters
RXTE/ASM and Swift/BAT Observations of Spectral Transitions in Bright X-ray Binaries in 2005-2010
Jing Tang, Wenfei Yu, Zhen Yan
We have studied X-ray spectral state transitions that can be seen in the long- term monitoring light curves of bright X-ray binaries from the All-Sky Monitor (ASM) on board the Ros…
Phase Drifts of Sub-pulses during the 2004 Giant Flare of SGR 1806-20 and Settling of the Magnetic Fields
Yi Xing, Wenfei Yu
We analyzed the observations of SGR 1806-20 performed with the \textit{Rossi X-ray Timing Explorer} (RXTE) during its 2004 giant flare. We studied the phase evolution of the sub-pu…
On the Origin of Ultraviolet Emission and the Accretion Model of Low-luminosity AGNs
Zhaolong Yu, Feng Yuan, Luis Ho
Low-luminosity active galactic nuclei (LLAGNs) are generally believed to be powered by an inner radiatively inefficient, advection-dominated accretion flow (ADAF), an outer truncat…
Magnetothermal and magnetorotational instabilities in hot accretion flows
De-Fu Bu, Feng Yuan, James M Stone
In a hot, dilute, magnetized accretion flow, the electron mean-free path can be much greater than the Larmor radius, thus thermal conduction is anisotropic and along magnetic field…
On the disappearance of broad-line region in low-luminosity active galactic nuclei: the role of the outflows from advection dominated accretion flows
Xinwu Cao
The broad-line region (BLR) disappears in many low-luminosity AGNs, the reason of which is still controversial. The BLRs in AGNs are believed to be associated with the outflows fro…
General relativistic polarized radiative transfer: building a dynamics-observations interface
Roman V. Shcherbakov, Lei Huang
The rising amount of polarized observations of relativistic sources requires the correct theory for proper model fitting. The equations for general relativistic (GR) polarized radi…