MONTE-CARLO SIMULATIONS OF COMPTONIZATION PROCESS IN A TWO COMPONENT ACCRETION FLOW AROUND A BLACK HOLE IN PRESENCE OF AN OUTFLOW

Abstract

A black hole accretion may have both the Keplerian and the sub-Keplerian components. In the so-called Chakrabarti-Titarchuk scenario, the Keplerian component supplies low energy (soft) photons while the sub-Keplerian component supplies hot electrons which exchange their energy with the soft photons through Comptonization or inverse Comptonization processes. In the sub-Keplerian component, a shock is generally produced due to the centrifugal force. The post-shock region is known as the CENtrifugal pressuresupported BOundary Layer (CENBOL). In this paper, we compute the effects of the thermal and the bulk motion Comptonization on the soft photons and study the emerging spectrum when the converging inflow and the diverging outflow (generated from the CENBOL) are simultaneously present. From the strength of the shock, we calculate the percentage of matter being carried away by the outflow and determine how the emerging spectrum depends on the outflow rate. The interplay between the up-scattering and down-scattering effects determines the effective shape of the emerging spectrum.