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Astron. Astrophys. 329, 895-905 (1998)


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The evolution of dynamo maintained magnetic fields
in a barred spiral galaxy

D. Moss 1, M. Korpi 2, P. Rautiainen 2 and H. Salo 2

1 Mathematics Department, University of Manchester, Manchester M13 9PL, UK
2 Department of Geosciences and Astronomy, P.L. 333, University of Oulu, FIN-90571 Oulu, Finland

Received 25 April 1997 / Accepted 20 August 1997

Abstract

We model the evolution of dynamo maintained magnetic fields in a barred spiral galaxy. The velocity fields are taken from N-body dynamical simulations. The important feature is the presence of strong, unsteady non-circular gas motions, driven by the central bar, The nonlinear dynamo calculations are carried out with both two dimensional (thin disc approximation) and three dimensional codes. The resulting magnetic field shows repeated episodes with approximately ring-like structure, and structure with short spiral arms. These morphological features appear robust, in that velocity data from distinct dynamical simulations gives rise to similar structures.

Key words: MHD – galaxies: kinematics and dynamics – galaxies: magnetic fields – galaxies: spiral

Send offprint requests to: D. Moss

© European Southern Observatory (ESO) 1998

Online publication: December 16, 1997
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