MG15 - Talk detail

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Black holes do not have any intrinsic atmosphere and therefore bipolar jets associated with AGNs and microquasars, should come from the accreting matter. Moreover, the radiations coming from these objects are sometimes dominated by high energy photons and sometimes by low energy photons. All these complicated energetic phenomena associated with accreting black holes, are necessarily an outcome of the accretion processes in a strong gravity regime. Therefore presently we concentrate on accretion phenomena in the general relativistic regime. The fluid is hot, therefore is fully ionized and its thermodynamics is described by a relativistic equation of state. We consider all possible cooling processes and the viscous stress tensor is parameterized by the Shakura-Sunyaev viscosity parameter. All possible transonic accretion solutions are presented. We study how the composition of the flow or viscosity parameters affects accretion physics. The effect of black hole spin on the state of the accretion disc is discussed. Jet formation and production of high energy radiation are also discussed.

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