2000/12/29 by Sandip K. Chakrabarti, Chakrabarti, Sandip K., Indranil Chattopadhyay +1
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0012531
World Scientific Style. Proceedings of the 9th Marcel Grossman Meeting in Rome (World Scientific, to appear)
arxiv created 2000/12/29 · arxiv updated 2009/12/01
Bulk motion Comptonization utilizes properties of both matter and radiation close to the horizon of a black hole. Computation with these considerations produce hard tails of energy spectral slope ∼ 1.5-1.7. These are the most direct evidence of the horizon of a black hole. We argue that even in presence of winds and outflows this property is not likely to change as winds are negligible in soft states.