The dependence of the viscosity in accretion discs on the shear/vorticity ratio | Zendy

M. A. Abramowicz | Zendy; Axel Brandenburg | Zendy; J. P. Lasota | Zendy

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The dependence of the viscosity in accretion discs on the shear/vorticity ratio

Author(s) -

M. A. Abramowicz,

Axel Brandenburg,

J. P. Lasota

Publication year - 1996

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/281.2.l21

Subject(s) - physics , vorticity , accretion (finance) , dynamo , astrophysics , schwarzschild radius , turbulence , accretion disc , shear (geology) , mechanics , vortex , magnetic field , quantum mechanics , petrology , geology

We estimate the Shakura-Sunyaev viscosity parameter α for different values of the shear/vorticity ratio, σ/ω, using local simulations of dynamo-generated turbulence. We find that the time average of α is approximately proportional to σ/ω (at least for σ/ω < 10). We point out that this result may have important implications for the properties of thick accretion discs, because there ω is small and α...

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