On the double natured solutions to the two-temperature external soft photon comptonized accretion disks

Details On the double natured solutions to the two-temperature external soft photon comptonized accretion disks On the double natured solutions to the two-temperature external soft photon comptonized accretion disks

2008-03-27

arxiv.org/abs/0803.3851v1

Astrophys.J.700:1086-1096,2009

Astronomy and Astrophysics

Astrophysics

7 pages, 6 tables

Scientific paper

10.1088/0004-637X/700/2/1086

We have analyzed pair production in the innermost region of a two-temperature external soft photon comptonized accretion disk. We have shown that, if the viscosity parameter is greater than a temperature and r dependent critical value, the solution to the disk equation is double valued: one, advection dominated and the other, radiation dominated. When the viscosity parameter is below this critical value, the accretion rate has to be confined within a region limited by a minimum and a maximum accretion rates in order to have two steady state solutions. These critical accretion rates are shown to be dependent on r, on the temperature and on the viscosity parameter . Depending on the combination of the parameters, the advection dominated solution may not be physically consistent.

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