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Magnetic flux captured by an accretion disk
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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 which 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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Cited by 2 Pith papers
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The physical mechanism for two rapid changing-look AGNs: SDSS J0225+0030 and SDSS J1723+5504
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Radio-X-ray Time Lags in GX 339-4: Probing Magnetic Field Transport in Black Hole Accretion
Time lag analysis using ICCF on GX 339-4 data reveals state-dependent radio-X-ray delays interpreted as evidence for magnetic field transport linking the inner accretion flow and jet.
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