Open AccessBehaviour of dissipative accretion flows around black holes
Author(s) -
Das Santabrata
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.11501.x
Subject(s) - physics , accretion (finance) , dissipative system , shock wave , dissipation , astrophysics , black hole (networking) , parameter space , shock (circulatory) , active galactic nucleus , advection , viscosity , shock front , classical mechanics , mechanics , galaxy , thermodynamics , medicine , computer network , routing protocol , statistics , routing (electronic design automation) , mathematics , computer science , link state routing protocol
We investigate the behaviour of dissipative accreting matter close to a black hole, as this provides important observational features of galactic and extragalactic black hole candidates. We find a complete set of global solutions in the presence of viscosity and synchrotron cooling. We show that advective accretion flow can have a standing shock wave and the dynamics of the shock is controlled by the dissipation parameters (both viscosity and cooling). We study the effective region of the parameter space for standing as well as oscillating shock. We find that the shock front always moves towards the black hole as the dissipation parameters are increased. However, viscosity and cooling have opposite effects in deciding the solution topologies. We obtain two critical cooling parameters that separate the nature of the accretion solution.