Accretion disc viscosity: how big is alpha?

被引：408

作者：

King, A. R. ^{[1
]}

Pringle, J. E.

Livio, M.

机构：

[1] Univ Leicester, Theoret Astrophys Grp, Leicester LE1 7RH, Leics, England

[2] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2007年 / 376卷 / 04期

关键词：

accretion; accretion discs;

D O I：

10.1111/j.1365-2966.2007.11556.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1740 / 1746

页数：7

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