Bulk Motion Comptonization - a sure sign of Black Holes
Abstract
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.
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