Prague Relativistic Astrophysics

Tapas K. Das

I will demonstrate that the accretion of non self-gravitating classical fluid onto astrophysical black holes may have multiple critical points by identifying the equations describing the space gradient of the dynamical flow velocity of the accreting matter to be equivalent to first order autonomous dynamical systems. Fixed point analysis ensures that such a flow must be multi-transonic for certain astrophysically relevant initial boundary conditions, and such multi-transonic flow allows the formation of Rankine-Hugoniot shock in the accretion disc. I also plan to demonstrate how such multi-transonic shocked flow model can be applied to explain various astrophysical phenomena, like generation of the AGN outflow and the X-ray flares from our Galactic centre, or the origin of the quasi periodic oscillations of black hole candidates.