Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..703..272m&link_type=abstract
PLASMAS IN THE LABORATORY AND IN THE UNIVERSE: New Insights and New Challenges. AIP Conference Proceedings, Volume 703, pp. 272
Physics
Galactic Nuclei, Circumnuclear Matter, And Bulges, Magnetohydrodynamics And Plasmas
Scientific paper
Magnetic field in Active Galactic Nucleus (AGN) is verified theoretically and observationally. Its origin and amplification is the contribution of the mean-field αgω dynamo in gravitomagnetic (GM) field, where αg and ω reflects the general relativistic (GR) frame-dragging (FD) effect of the central Kerr black hole (BH) in the curved 3+1 spacetime. However, the constraint imposed by magnetic helicity conservation limits the growth of the field. Its strength develops to a saturation value which depends on αg and ω. With a set of parameters of the turbulent plasma accreting to a rotating supermassive BH of 108Msolar with a dimensionless spin of 0.7, the mean-field strength is predicted to be in the order of 104G.
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