Role of viscosity and cooling in hydrodynamic simulation of Two Component Accretion Flow (TCAF) around black holes

Kinsuk Giri1*and Sandip K. Chakrabarti1,2
1S.N. Bose National Centre for Basic Science, Salt Lake, Kolkata 700098, India
2Indian Centre for Space Physics, Chalantika 43, Garia Station Rd., Kolkata 700084, India

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We carry out numerical simulation of accretion flows around a black hole in presence of both viscous and cooling effects. Instead of using a constant α parameter throughout the simulation grid, we assume that α is maximum on the equatorial plane and gradually goes down in theperpendicular direction. We show that when the injected sub-Keplerian flow angular momentum is high enough and/or the viscosity and also cooling is high enough, Two Component Accretion Flow (TCAF) would be formed, otherwise the sub-Keplerian flow would remain sub-Keplerian. We see that a Keplerian disk is produced on the equatorial plane. Time variations of the total, Keplerian and Sub-Keplerianmatter are studied with respect to various flow parameters.

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Keywords : black holes: accretion – black holes: hydrodynamics – black holes: cooling