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38 papers · 2 filters
On the role and origin of nonthermal electrons in hot accretion flows
Andrzej Niedzwiecki, Agnieszka Stepnik, Fu-Guo Xie
We study the X-ray spectra of tenuous, two-temperature accretion flows using a model involving an exact, Monte Carlo computation of the global Comptonization effect as well as gene…
Radiation hydrodynamics simulations of wide-angle outflows from super-critical accretion disks around black holes
Katsuya Hashizume, Ken Ohsuga, Tomohisa Kawashima +1
By performing two-dimensional radiation hydrodynamics simulations with large computational domain of 5000 Schwarzschild radius, we revealed that wide-angle outflow is launched via…
Black Hole Mass Estimates and Rapid Growth of Supermassive Black Holes in Luminous 3.5 Quasars
Wenwen Zuo, Xue-Bing Wu, Xiaohui Fan +3
We present new near-infrared (IR) observations of the H and MgII lines for 32 luminous quasars with using the Palomar Hale 200 inch telesco…
Correlation between the photon index and X-ray luminosity of black hole X-ray binaries and active galactic nuclei: observations and interpretation
Qi-Xiang Yang, Fu-Guo Xie, Feng Yuan +4
We investigate the observed correlation between the 2--10 keV X-ray luminosity (in unit of the Eddington luminosity; ) and the photon index () of the X-r…
Energy dependence of the band-limited noise in black hole X-ray binaries
H. Stiele, W. Yu
Black hole low-mass X-ray binaries show a variety of variability features, which manifest themselves as narrow peak-like structures superposed on broad noise components in power de…
Low frequency QPOs and possible change in the accretion geometry during the outbursts of Aquila X1
Wenda Zhang, Wenfei Yu
We have studied the evolution of the Low Frequency Quasi-Periodic Oscillations (LFQPOs) during the rising phase of seven outbursts of the neutron star Soft X-ray Transient (SXT) Aq…