Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-27
Astronomy and Astrophysics
Astrophysics
latex, 18 pages, 2 figures. Accepted by ApJLetters
Scientific paper
10.1086/311351
We discuss the emergent spectra from accreting black holes, considering in particular the case where the accretion is characterized by relativistic bulk motion. We suggest that such accretion is likely to occur in a wide variety of black hole enviroments, where the strong gravitational field is expected to dominate the pressure forces, and this likely to lead to a characteristic high-energy spectriscopic signature; an extended power tail. It is in the high (soft) state that matter impinging upon the event horizon can be viewed directly, and intrinsic power-law seen. A test of the model is presented using observational data from the Compton Gamma Ray Observatory and the Rossi X-ray Timing Explorer, covering 2- 200 keV for recent galactic black hole X-ray nova outbursts.
Shrader Chris
Titarchuk Lev
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