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Viscosity in Selfgravitating Accretion Disks | | W.J. Duschl
; Peter A. Strittmatter
; Peter L. Biermann
; | | Date: |
14 Feb 1997 | | Subject: | astro-ph | | Affiliation: | 1,3), Peter A. Strittmatter (2,3), Peter L. Biermann ( Institut fuer Theoretische Astrophysik, Heidelberg, Germany; Steward Observatory, The University of Arizona, Tucson, AZ, USA; Max-Planck-Institut fuer Radioastronomie, Bonn, Germany | | Abstract: | We show that the standard model for geometrically thin accretion disks (alpha-disks) leads to inconsistencies if selfgravity plays a role. This problem arises from the parametrization of viscosity in terms of local sound velocity and vertical disk scale height. A viscosity prescription based on turbulent flows at the critical effective Reynolds number allows for consistent models of thin selfgravitating disks, and recovers the alpha-disk solution as the limiting case of negligible selfgravity. We suggest that such selfgravitating disks may explain the observed spectra of protoplanetary disks and yield a natural explanation for the radial motions inferred from the observed metallicity gradients in disk galaxies. | | Source: | arXiv, astro-ph/9702132 | | Services: | Forum | Review | PDF | Favorites | |
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