Journal
ASTROPHYSICAL JOURNAL
Volume 674, Issue 1, Pages 408-414Publisher
IOP PUBLISHING LTD
DOI: 10.1086/524838
Keywords
accretion, accretion disks; instabilities; magnetic fields; MHD
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We investigate the behavior of the magnetic Prandtl number ( the ratio of microscopic viscosity to resistivity) for accretion sources. Generally this number is very small in standard accretion disk models, but it can become larger than unity within similar to 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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