Bimodal Accretion Disks: SSD-ADAF Transitions

Details Bimodal Accretion Disks: SSD-ADAF Transitions Bimodal Accretion Disks: SSD-ADAF Transitions

2000-08-21

arxiv.org/abs/astro-ph/0008319v1

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures, accepted by ApJ Letter

Scientific paper

We show that, unlike the results presented previously in the literature, the transition from an outer Shakura-Sunyaev disk (SSD) to an advection-dominated accretion flow (ADAF) is possible for large values of the viscosity parameter $\alpha >0.5$. The transition is triggered by thermal instability of a radiation-pressure-supported SSD. The transition radius is close to the central black hole. We confirm our qualitative prediction by actually constructing global bimodal SSD-ADAF solutions.

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