Relativistic Accretion Mediated by Turbulent Comptonization

Details Relativistic Accretion Mediated by Turbulent Comptonization Relativistic Accretion Mediated by Turbulent Comptonization

2008-12-20

arxiv.org/abs/0812.3915v1

Astronomy and Astrophysics

Astrophysics

5 pages submitted to ApJ

Scientific paper

Black hole and neutron star accretion flows display unusually high levels of hard coronal emission in comparison to all other optically thick, gravitationally bound, turbulent astrophysical systems. Since these flows sit in deep relativistic gravitational potentials, their random bulk motions approach the speed of light, therefore allowing turbulent Comptonization to be an important effect. We show that the inevitable production of hard X-ray photons results from turbulent Comptonization in the limit where the turbulence is trans-sonic and the accretion power approaches the Eddington Limit. In this regime, the turbulent Compton y-parameter approaches unity and the turbulent Compton temperature is a significant fraction of the electron rest mass energy, in agreement with the observed phenomena.

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