Magnetic flux captured by an accretion disk

Magnetic flux captured by an accretion disk

We suggest a possible mechanism of efficient transport of the large-scale external magnetic flux inward through a turbulent accretion disk. The outward drift by turbulent diffusion that limits the effectiveness of this process is reduced if the external flux passes through the disk in concentrated p...

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Bibliographic Details
Published in:The Astrophysical journal Vol. 629; no. 2; pp. 960 - 968
Main Authors: SPRUIT, H. C, UZDENSKY, Dmitri A
Format: Journal Article
Language:English
Published: Chicago, IL University of Chicago Press 20-08-2005
Subjects:
Active galaxies
Magnetic flux
black hole physics
Black holes
accretion, accretion disks
galaxies: active
MHD
Cosmology
Magnetic fields
Accretion disks
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Description
Summary:We suggest a possible mechanism of efficient transport of the large-scale external magnetic flux inward through a turbulent accretion disk. The outward drift by turbulent diffusion that limits the effectiveness of this process is reduced if the external flux passes through the disk in concentrated patches. Angular momentum loss by a magnetocentrifugal wind from these patches of strong field adds to the inward drift. We propose that magnetic flux accumulating in this way at the center of the disk provides the "second parameter" determining X-ray spectral states of black hole binaries and the presence of relativistic outflows.
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ISSN:0004-637X
1538-4357
DOI:10.1086/431454