Axisymmetric accretion flows very near black holes and Rosencollapsed objects
Abstract
Motivated by the need for stronger observational leverage on the black hole hypothesis and for a more detailed characterization of axisymmetric accretion flows across the marginally stable circular orbit atr{inms}, we develop a general approach for describing the nonKeplerian accretion in the regionr{inH}⩽r⩽ r{in0}, wherer{inH}≡ radius of the event horizon andr{in0}⩾r{inms}. Our procedure possesses many advantages, including easily imposed consistency with the Keplerian model forr>r{in0}, the avoidance ofad hoc boundary conditions atr{inms} and/or atr{inH}, and its application also to accretion in Rosen's bimetric theory, whose spherically symmetric solution has the same qualitative orbital topography as that of general relativity. It becomes apparent, furthermore, that the particular viscosity law chosen in our procedure will have a crucial bearing on the flow in the regionr{inms}<r<r{in0}.
 Publication:

General Relativity and Gravitation
 Pub Date:
 June 1979
 DOI:
 10.1007/BF00756903
 Bibcode:
 1979GReGr..10..671S
 Keywords:

 Axisymmetric Flow;
 Black Holes (Astronomy);
 Stellar Mass Accretion;
 Stellar Models;
 Angular Momentum;
 Circular Orbits;
 Nonlinear Equations;
 Radial Velocity;
 Schwarzschild Metric;
 Viscosity;
 Astrophysics;
 Accretion:Black Holes