Comments on the Newly Discovered Advection Dominated Flows Around Black holes and Neutron stars

Details Comments on the Newly Discovered Advection Dominated Flows Around Black holes and Neutron stars Comments on the Newly Discovered Advection Dominated Flows Around Black holes and Neutron stars

1995-08-15

arxiv.org/abs/astro-ph/9508060v1

Astronomy and Astrophysics

Astrophysics

14 pages text plus 4 figures, all in tar-compressed postscript form; submitted: Astrophysical Journal, June 7th, 1995

Scientific paper

We provide complete and global solutions of transonic flows around black holes, in presence of advection, rotation, heating and cooling. We show that for any degree of advection, there may exist two critical viscosity parameters $\alpha_{c1, c2}$ such that for $\alpha <\alpha_{c1}$ the flow may pass through the inner sonic point only. For $\alpha_{c1} <\alpha<\alpha_{c2}$, the flow may have shock waves, and for $\alpha>\alpha_{c2}$, the flow may again pass through the inner sonic point, depending on flow parameters. No new topologies emerge other than what we found earlier while studying viscous isothermal transonic flows. These findings indicate that the newly discovered advection dominated flows do not constitute any new solutions.

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