Accretion disc viscosity: how big is alpha?

Abstract

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.

MNRAS, in press

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• Mass transport in galaxy discs limits black hole growth to sub-Eddington rates
• A unified framework for hot accretion flows with finite angular momentum: from Bondi-like to disc-like regimes
• Non-periodic type I Be/X-ray binary outbursts
• The physical relation between disc and coronal emission in quasars
• GRB variabilities and following gravitational waves induced by gravitational instability in NDAFs