Shakura-Sunyaev Disk Can Smoothly Match Advection-Dominated Accretion Flow
Abstract
We use the standard Runge-Kutta method to solve the set of basic equations describing black hole accretion flows composed of two-temperature plasma. We do not invoke any extra energy transport mechanism such as thermal conduction and do not specify any ad hoc outer boundary condition for the advection-dominated accretion flow (ADAF) solution. We find that in the case of high viscosity and non-zero radiative cooling, the ADAF solution can have an asymptotic approach to the Shakura-Sunyaev disk (SSD) solution, and the SSD-ADAF transition radius is close to the central black hole. Our results further prove the mechanism of thermal instability-triggered SSD-ADAF transition suggested previously by Takeuchi & Mineshige and Gu & Lu.
Cite
@article{arxiv.astro-ph/0401018,
title = {Shakura-Sunyaev Disk Can Smoothly Match Advection-Dominated Accretion Flow},
author = {Ju-Fu Lu and Yi-Qing Lin and Wei-Min Gu},
journal= {arXiv preprint arXiv:astro-ph/0401018},
year = {2009}
}
Comments
10 pages, 2 figures, accepted for publication in ApJ Letters