Ring currents and poloidal magnetic fields in nuclear regions of galaxies

Details Ring currents and poloidal magnetic fields in nuclear regions of galaxies Ring currents and poloidal magnetic fields in nuclear regions of galaxies

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217...99l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 99-107.

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50

Active Galaxies, Computational Astrophysics, Galactic Nuclei, Magnetic Field Configurations, Ring Currents, Dynamo Theory, Irregular Galaxies, Poloidal Flux, Turbulence Effects

Scientific paper

The origin of observed strong poloidal magnetic fields R(z) in the central regions of galaxies which have gaseous rings is discussed. In the context of galactic disk dynamo models only weak poloidal fields but strong toroidal fields result. The strength of the poloidal fields is tied to the central activity and apply known and tested ideas rigorously. A battery process on galactic scales is discussed which ensures the existence of a large-scale magnetic field in the inner galactic region. The frozen-in field may be amplified by v x B compression and turbulent stretching; the resulting field is poloidal. The central activity provides a flow field which can produce B(z) equal to or greater than B(phi).

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