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Bulk Motion Comptonization - a sure sign of Black Holes

Sandip K. Chakrabarti·Indranil Chattopadhyay
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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 $\sim 1.5-1.7$. 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.

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Sandip K. Chakrabarti, Indranil Chattopadhyay. 2000-12-29. Bulk Motion Comptonization - a sure sign of Black Holes. https://arxiv.org/abs/astro-ph/0012531

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