Evolution of transonicity in an accretion disc

Details Evolution of transonicity in an accretion disc Evolution of transonicity in an accretion disc

2007-03-11

arxiv.org/abs/astro-ph/0703251v1

Class.Quant.Grav.24:1479-1493,2007

Astronomy and Astrophysics

Astrophysics

18 pages

Scientific paper

10.1088/0264-9381/24/6/007

For inviscid, rotational accretion flows driven by a general pseudo-Newtonian potential on to a Schwarzschild black hole, the only possible fixed points are saddle points and centre-type points. For the specific choice of the Newtonian potential, the flow has only two critical points, of which the outer one is a saddle point while the inner one is a centre-type point. A restrictive upper bound is imposed on the admissible range of values of the angular momentum of sub-Keplerian flows through a saddle point. These flows are very unstable to any deviation from a necessarily precise boundary condition. The difficulties against the physical realisability of a solution passing through the saddle point have been addressed through a temporal evolution of the flow, which gives a non-perturbative mechanism for selecting a transonic solution passing through the saddle point. An equation of motion for a real-time perturbation about the stationary flows reveals a very close correspondence with the metric of an acoustic black hole, which is also an indication of the primacy of transonicity.

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