Talk detail

Participant	Garain, Sudip Kumar
Institution	S N Bose National Center for Basic Sciences - Block JD, Sector III, Salt Lake - Kolkata - West Bengal - India

Session	SO1	Accepted		Order	Time
Talk	Oral abstract	Title	Effects of Compton Cooling on the Outflow in a Two Component Accretion Flow around a Black Hole: Results of Coupled Monte Carlo-TVD Simulation
Co-authors
Abstract	We present the results of the investigation of the effects of cooling of the Compton cloud on the outflow formation rate in an accretion disk around a black hole. We carry out a time dependent numerical simulation where both the hydrodynamics and the radiative transfer processes are coupled together. We consider a two-component accretion flow in which the Keplerian disk is immersed into an accreting low-angular momentum flow (halo) around a black hole. The soft photons from the Keplerian disk are inverse-Comptonized by the electrons in the pre-shock and the post-shock regions of the halo. We run several cases by changing the rate of the Keplerian disk. We show that as a result of Comptonization of the Compton cloud, the cloud becomes cooler with the increase in the Keplerian disk rate. As the resultant thermal pressure is reduced, the post-shock region collapses and the outflow rate is reduced. Since the hard radiation is produced from the post-shock region, and the spectral slope increases with the reduction of the electron temperature, the cooling produces softer spectrum. We thus find a direct correlation between the spectral states and the outflow rates of an accreting black hole.