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Frequency Dependent Lags - A Common Phenomenon of Accreting Sources
Xin-Min Hua, Demosthenes Kazanas, Wei Cui
The Fourier frequency dependent hard X-ray lag, first discovered from the analysis of aperiodic variability of the light curves of the black hole candidate Cygnus X-1, turns out to…
Evidence for Centrifugal Barrier in X-ray Pulsar GRO J1744-28
Wei Cui
We present further observational evidence of the effects of a centrifugal barrier in GRO J1744-28, based on continued monitoring of the source with RXTE. For X-ray pulsars, the cen…
Cygnus X-1: A Spinning Black Hole?
Wei Cui, Wan Chen, S. N. Zhang
It has been a long-standing puzzle what triggers the spectral transition between the hard and soft states in Cyg X-1. Also, the origin of the frequently observed X-ray flares in th…
Spectral Transitions in Cyg X-1 and Other Black Hole X-Ray Binaries
Ann A. Esin, Ramesh Narayan, Wei Cui +2
We show that the model proposed by Esin, McClintock & Narayan (1997) for the low state, intermediate state and high state of the black hole soft X-ray transient, Nova Muscae 1991,…
Cygnus X-1: X-ray Emission Mechanism and Geometry
Wei Cui, S. N. Zhang, J. H. Swank +3
We summarize recent observations of Cyg X-1 during its 1996 state transition. The results favor an emission geometry with a central optically thin corona surrounded by an optically…
Simultaneous ASCA And RXTE Observations of Cygnus X--1 During Its 1996 State Transition
Wei Cui, K. Ebisawa, T. Dotani +1
We report results from simultaneous ASCA and RXTE observations of Cyg X-1 when the source made a rare transition from the hard (= low) state to the soft (= high) state in 1996. The…