On the Magnetic Prandtl Number Behavior of Accretion Disks

Details On the Magnetic Prandtl Number Behavior of Accretion Disks On the Magnetic Prandtl Number Behavior of Accretion Disks

2007-06-06

arxiv.org/abs/0706.0828v2

Astronomy and Astrophysics

Astrophysics

15 pages, 6 figures. Accepted for publication in the Astrophysical Journal (February 10, 2008 issue.) Minor changes from origi

Scientific paper

10.1086/524838

We investigate the behavior of the magnetic Prandtl number (ratio of microscopic viscosity to resistivity) for accretion sources. Generally this number is very small in standard accretion disk models, but can become larger than unity within $\sim 50$ Schwarzschild radii of the central mass. Recent numerical investigations suggest a marked dependence of the level of MHD turbulence on the value of the Prandtl number. Hence, black hole and neutron star accretors, i.e. compact X-ray sources, are affected. The astrophysical consequences of this could be significant, including a possible route to understanding the mysterious state changes that have long characterized these sources.

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