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Accretion disc viscosity: how big is alpha? | | A. R. King
; J. E. Pringle
; M. Livio
; | | Date: |
29 Jan 2007 | | 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. | | Source: | arXiv, astro-ph/0701803 | | Services: | Forum | Review | PDF | Favorites | |
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