Volume 512, March-April 2010
|Number of page(s)||5|
|Published online||02 April 2010|
Galactic winds and the symmetry properties of galactic magnetic fields
School of Mathematics, University of Manchester,
Oxford Road, Manchester, M13 9PL, UK e-mail: email@example.com
2 Department of Physics, Moscow University, 119 992 Moscow, Russia
3 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Accepted: 26 January 2010
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.
Key words: magnetohydrodynamics / galaxies: magnetic fields / galaxies: spiral / galaxies: halos / ISM: magnetic fields
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.