Research Accomplished

We study the axisymmetric general relativistic flow in Kerr metric, and investigate its multi-transonic properties. We then calculate the shock location (employing a complete general relativistic treatment for shock finding, which has, for the first time, been introduced in the literature), and study the properties of the post shock flow, to demonstrate that such flow may generate accretion powered astrophysical jets emanating out from the Quasars and micro-quasars, as well as from the GRBs.

Various dynamical and thermodynamic flow variables upto the point extremely close to the event horizon in Kerr metric has also been studied, as a function of Kerr parameter $a$. The terminal behaviour of in-falling matter (e.g., flow temperature, pressure, density etc. which are responsible to characterize the observed spectra) could be studied as a function of black hole spin. By far the most discussed approach to study the spectral signature of black hole spin was through the study of the skewed shapes of fluorescent iron lines. Our work on general relativistic black hole accretion flow provides an independent approach to this key question for hot, low angular momentum, prograde accretion flows, as well as for retrograde flows with substantial angular momentum.