Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...512a..61m&link_type=abstract
Astronomy and Astrophysics, Volume 512, id.A61
Astronomy and Astrophysics
Astrophysics
11
Magnetohydrodynamics, Galaxies: Magnetic Fields, Galaxies: Spiral, Galaxies: Halos, Ism: Magnetic Fields
Scientific paper
Context. Contemporary studies of the symmetry properties of galactic magnetic fields contain two contradictory ideas. There are observational and theoretical hints that large-scale magnetic fields are symmetric with respect to the galactic plane in the disc, and antisymmetric in the halo. On the other hand, standard galactic dynamo models without a galactic wind give symmetric or antisymmetric configurations in both disc and halo regions simultaneously. Aims: Here we explore the role of a galactic wind in resolving this dichotomy. Methods: The key idea is that a galactic wind must be be taken into account in order to resolve the problem. We perform a search of the parameter space of galactic dynamo models containing such winds. Results: By including a galactic wind, magnetic configurations of such symmetry, i.e. approximately even in the disc and odd in the halo, can be obtained. We note that a variety of other solutions can also be found. Conclusions: A galactic wind plays a significant role in determining the structure of galactic magnetic configurations and should be included in future modelling.
Beck Rainer
Krause Marita
Moss Derek
Sokoloff Dimitry
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