Cygnus X-1: A Spinning Black Hole?
Wei Cui, Wan Chen, S. N. Zhang
Abstract
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 the source still remains a mystery. In this paper, we will make an attempt to address these issues in light of our recent work on black hole spin and its observational consequences.
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