Mechanism of formation of a dipole magnetic field in the central regions of active galaxies

Details Mechanism of formation of a dipole magnetic field in the central regions of active galaxies Mechanism of formation of a dipole magnetic field in the central regions of active galaxies

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap.....39...58a&link_type=abstract

Astrophysics, Volume 39, Issue 1, pp.58-62

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

A model of the formation of large-scale magnetic fields of dipole configuration in the central regions (r ≈ 100 pc) of active galaxies is studied. It is assumed that these regions contain a rapidly rotating, highly ionized gas (Ω ≈ 5·10-15 sec, Ne ≈ 103 cm-3). Ionized matter escapes from the center of the region with a velocity of several hundred km/sec and is entrained by the rotation of the surrounding medium. Biermann's "battery" effect [L. Biermann, Z. Naturforsch., 5a, 65 (1950)] operates under such conditions, and circular electric currents are formed in the medium, which amplify the dipole magnetic fields. During the active phase of a galaxy, about 108 years, the magnetic field strength at the boundary of this region may reach 10-4 10-3 G.

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