Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-22
Astrophys.J.612:L45-L48,2004
Astronomy and Astrophysics
Astrophysics
accepted for publication in ApJL
Scientific paper
10.1086/424567
We investigate the shot cutoff timescale evolutions during different spectral states in the black hole binary Cygnus X-1 with the recently proposed w spectral analysis technique. For low energy shots, their cutoff timescale decreases from the low state to intermediate state, and to high state monotonically. However in the high energy range, where shots are believed to be reprocessed in the hot corona, timescales are almost the same for different spectral states. A linear correlation is found between the energy spectrum photon index and the shot cutoff timescale at low energies. Both narrow and broad iron Kalpha lines are distinguished from timing analysis, providing dynamical evidence that broad and narrow iron lines originate respectively at small and large radii of the accretion disk. Possible mechanisms for state transitions and accretion flow geometry in accreting stellar mass black holes are discussed.
Feng Hua
Li Ti Pei
Zhang Shuang-Nan
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