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Title:
Testing the locality of transport in self-gravitating accretion discs
Authors:
Lodato, G.; Rice, W. K. M.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 351, Issue 2, pp. 630-642. (MNRAS Homepage)
Publication Date:
06/2004
Origin:
MNRAS
Astronomy Keywords:
accretion, accretion discs, gravitation, instabilities, stars: formation, galaxies: active
DOI:
10.1111/j.1365-2966.2004.07811.x
Bibliographic Code:
2004MNRAS.351..630L

Abstract

In this paper, we examine the issue of characterizing the transport associated with gravitational instabilities in relatively cold discs, discussing in particular the conditions under which it can be described within a local, viscous framework. We present the results of global, three-dimensional, smoothed particle hydrodynamics simulations of self-gravitating accretion discs, in which the disc is cooled using a simple parametrization for the cooling function. Our simulations show that the disc settles in a `self-regulated' state, where the axisymmetric stability parameter Q~ 1 and where transport and energy dissipation are dominated by self-gravity. We have computed the gravitational stress tensor and compared our results with expectations based on a local theory of transport. We find that, as long as the disc mass is smaller than 0.25M* and the aspect ratio H/R<~ 0.1, transport is determined locally, thus allowing for a viscous treatment of the disc evolution.

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