Two-temperature advective transonic accretion flows around black holes

Abstract

Abstract We present here unique transonic two-temperature accretion solutions in presence of radiation processes. Unlike one-temperature flow, the set of equations governing two-temperature flow is not complete, since for the latter, the number of equations is less than the number of flow variables. Consequently, a large number of transonic solutions of the equations of motion exist, for a given set of constants of motion. We invoke the second law of thermodynamics and identified the solution with the maximum entropy as the physically possible solution. In this paper, we compare spherical and rotating accretion two-temperature flows. We also show that the luminosity, as well as radiative efficiency of rotating flows, is higher by an order of magnitude, as compared to spherical flows.