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Temperature distribution of thin magnetized accretion disks with anomalous viscosity
Published online by Cambridge University Press: 12 October 2004
Abstract
Magnetohydrodynamic processes in thin accretion disks involving magnetic viscosity are investigated. The relevant MHD equations for the thin disk approximation and the anomalous magnetic viscosity dependent on temperature $T$ and radius $r$ are included. These stationary structures, including distributions of the surface mass density, temperature, in-flow velocity and magnetic fields of a disk around a young stellar object, are numerically examined. It is shown that the consideration of anomalous viscosity is necessary for the validity of the distributions. For example, the surface density is a decreasing function of radius because of it and there is a strange increasing part in the distribution of the density if it is ignored. In particular the distribution of effective temperature is a smoothly decreasing function of radius with power index $q\,{=}\,{-}\frac{1}{2}$, corresponding to the observed radiation flux density, provided that the magnetic fields are suitably chosen.
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- 2004 Cambridge University Press
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