Abstract We proposed a new statistic ω spectrum which can detect the shot width distribution sensitively. By applying the ω spectrum to X-ray binaries, we can distinguish between neutron stars and black holes from their different shot behaviours at small timescales. The energy dependent analysis for black hole binaries, in particular for Cyg X-1, can help us to reveal dynamical evidence for black hole accretion flows and state transitions. Both narrow and broad iron Kα lines are presented in the ω analysis, affording dynamical evidence for iron lines origin.
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