We describe astrophysical processes around a black hole keeping primarily the physics of
accretion in mind. In Section 1, we briefly discuss the formation, evolution and detection of …

A new branch of equilibrium solutions for stationary accretion disks around black holes is
found. These solutions correspond to moderately super-Eddington accretion rates. The …

Accretion disk theory was first developed assuming local heat balance where the energy
produced by viscous heating was emitted from the sides of the disk. One of the important …

This paper presents all the Rankine-Hugoniot shock solutions for the stationary, axially
symmetric and rotating adiabatic flows of small transverse thickness in the black hole …

Interstellar magnetic fields play certainly a distinct role in star formation and in galactic
molecular disks. These magnetic fields are, however, also a key ingredient for accretion …

We present global solutions that describe advection-dominated accretion flows around black
holes. The solutions are obtained by solving numerically a set of coupled ordinary …

This book presents methods of studying transonic flows applicable to various astrophysical
circumstances. This is the first book of its kind and efforts have been made to be as thorough …

The recent Chandra observation of the radio source at the center of our Galaxy, Sgr A*, puts
new constraints on its theoretical models. The spectrum is very soft, and the source is rapidly …

The authors have developed a 2D axisymmetric, general relativistic code to study inviscid
hydrodynamic accretion flows in a fixed Kerr black hole gravitational field. In this first of …

We present a detailed three-dimensional magnetohydrodynamic (MHD) simulation
describing the inner region of a disk accreting onto a black hole. To avoid the technical …