Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 376, Issue 4, Pages 1740-1746Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2007.11556.x
Keywords
accretion; accretion discs
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We consider observational and theoretical estimates of the accretion disc viscosity parameter alpha. We find that in thin, fully ionized discs, the best observational evidence suggests a typical range alpha similar to 0.1-0.4, whereas the relevant numerical simulations tend to derive estimates for alpha which are an order of magnitude smaller. We discuss possible reasons for this apparent discrepancy.
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