Investigation of radiative outflows around compact objects

Winds and outflows form in active galaxies and in binary systems which are known to harbour compact objects such as black holes. Matter starting subso nically from a disc must be accelerated very close to the black hole in ord er to reach a velocity comparable to the velocity of light, which is actual ly observed. In the absence of magnetic fields, winds forming in inner regi ons of accretion discs could primarily be accelerated by radiations emitted from this region where centrifugal force is important. We study critical p oint behaviour of outflows in presence of this radiative acceleration. We s how that the momentum deposition term changes the character of the solution drastically depending on the magnitude and the location of the deposition. We discuss the implications of these solutions in detail. Particularly imp ortant is the fact that matter were found to be pushed to infinity even whe n they were originally bound energetically. We perform numerical simulation s by smoothed particle hydrodynamics (SPH), and show that these new solutio ns are stable.