Accretion disc viscosity: how big is alpha?

Details Accretion disc viscosity: how big is alpha? Accretion disc viscosity: how big is alpha?

2007-01-29

arxiv.org/abs/astro-ph/0701803v1

Mon.Not.Roy.Astron.Soc.376:1740-1746,2007

Astronomy and Astrophysics

Astrophysics

MNRAS, in press

Scientific paper

10.1111/j.1365-2966.2007.11556.x

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 $\alpha \sim 0.1 - 0.4$, 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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