Abstract
A magnetodynamic model for the formation of jets and lobes of radio galaxies and quasars is presented with a tentative picture for the formation of galaxies from a magnetized medium. Interaction of the large scale magnetic field with the gravitationally contracting disk, which is rotating at the throat of an hourglass-shaped magnetic field, twists up the magnetic field, and the j×B force in the relaxing twist (non-linear torsional Alfven wave) drives the gas in the disk atmosphere into helical flows in the bipolar directions along the large scale magnetic field. The twist pinches the poloidal field along the axis on one hand, and, on the other hand, tuckes up the magnetic field into the shape of an umbrella with increasing pinch strength as the low Alfven velocity region near the edge of the “cavity” is approached. These explain the observed jets, lobes, hot spots, etc., in a natural way. The back-reaction of these on the disk means an efficient extraction of the angular momentum from the disk, allowing a high rate of accretion, and may explain the enhanced energy liberation at AGN’s.
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Uchida, Y., Hamatake, H. (1989). Formation of Radio Jets and Lobes, and Enhanced Energy Liberation at AGN’s. In: Belvedere, G. (eds) Accretion Disks and Magnetic Fields in Astrophysics. Astrophysics and Space Science Library, vol 156. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2401-7_24
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DOI: https://doi.org/10.1007/978-94-009-2401-7_24
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