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42 papers · 2 filters
Effect of non-stationary accretion on spectral state transitions: An example of a persistent neutron star LMXB 4U 1636-536
H. Zhang., W. -F. Yu
Observations of the black hole and neutron star X-ray binaries show that the luminosity of the hard-to-soft state transition is usually higher than that of the soft-to-hard state t…
Joint Fit of Warm Absorbers in COS & HETG Spectra of NGC 3783
Xiao-Dan Fu, Shui-Nai Zhang, Wei Sun +2
Warm Absorbers (WAs), as an important form of AGN outflows, show absorption in both UV and X-ray band. Using XSTAR generated photoionization models, for the first time we present a…
Multi-Band Intra-Night Optical Variability of BL Lacertae
Haritma Gaur, Alok C. Gupta, R. Bachev +5
We monitored BL Lacertae frequently during 2014 - 2016 when it was generally in a high state. We searched for intra-day variability for 43 nights using quasi-simultaneous measureme…
Jet production in black-hole X-ray binaries and active galactic nuclei: mass feeding and advection of magnetic fields
Xinwu Cao, Dong Lai
Relativistic jets are observed only in the low/hard and intermediate states of X-ray binaries (XRBs), and are switched off in the thermal state, but they appear to be present in bo…
Active Galactic Nuclei Feedback in an Elliptical Galaxy with the Most Updated AGN Physics (I): Low-angular Momentum Case
Feng Yuan, Doosoo Yoon, Ya-Ping Li +3
We investigate the effects of AGN feedback on the cosmological evolution of an isolated elliptical galaxy by performing two-dimensional high-resolution hydrodynamical numerical sim…
State Transitions in Ultracompact Neutron Star LMXBs: towards the Low Luminosity Limit
Jie Lin, Wenfei Yu
Luminosity of X-ray spectral state transitions in black hole and neutron star X-ray binaries can put constraint on the critical mass accretion rate between accretion regimes. Previ…