Bulk Motion Comptonization - a sure sign of Black Holes
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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 $\sim 1.5-1.7$. 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.
World Scientific Style. Proceedings of the 9th Marcel Grossman Meeting in Rome (World Scientific, to appear)
World Scientific Style. Proceedings of the 9th Marcel Grossman Meeting in Rome (World Scientific, to appear)