The Nature of Spectral Transitions in Accreting Black Holes : The Case of Cyg X-1

@inproceedings{Poutanen1997TheNO,
  title={The Nature of Spectral Transitions in Accreting Black Holes : The Case of Cyg X-1},
  author={Juri Poutanen and Julian Krolik and Felix Ryde},
  year={1997}
}
Accreting black holes radiate in one of several spectral states, switching from one to another for reasons that are as yet not understood. Using the best studied example, Cyg X-1, we identify the geometry and physical conditions characterizing these states. In particular, we show that in the hard state most of the accretion energy is dissipated in a corona-like structure which fills the inner few tens of gravitational radii around the black hole and has Compton optical depth of order unity. In… CONTINUE READING

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