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Magnetic fields in barred galaxies. II. Dynamo models

Lookup NU author(s): Professor Anvar Shukurov, Professor Dmitry Sokoloff, Dr Andrew Fletcher

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Abstract

We study the generation and maintenance of large-scale magnetic fields in barred galaxies. We take a velocity field (with strong noncircular components) from a published gas dynamical simulation of Athanassoula (1992), and use this as input to a galactic dynamo calculation. Our work is largely motivated by recent high quality VLA radio observations of the barred galaxy NGC 1097, and we compare our results in detail with the regular magnetic fields deduced from these observations. We are able to reproduce most of the conspicuous large-scale features of the observed regular field, including the field structure in the central regions, by using a simple mean-field dynamo model in which the intensity of interstellar turbulence (more precisely, the turbulent diffusivity) is enhanced by a factor of 2-6 in the dust lanes and near the circumnuclear ring. We argue that magnetic fields can by dynamically important, and therefore should be included in models of gas flow in barred galaxies.


Publication metadata

Author(s): Moss D, Shukurov A, Sokoloff D, Beck R, Fletcher A

Publication type: Article

Publication status: Published

Journal: Astronomy and Astrophysics

Year: 2001

Volume: 380

Issue: 1

Pages: 55-71

Print publication date: 01/12/2001

ISSN (print): 0004-6361

ISSN (electronic): 1432-0746

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1051/0004-6361:20011343

DOI: 10.1051/0004-6361:20011343


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