Vertical Magnetic Fields above the Discs of Spiral Galaxies

Details Vertical Magnetic Fields above the Discs of Spiral Galaxies Vertical Magnetic Fields above the Discs of Spiral Galaxies

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271...36b&link_type=abstract

Astronomy and Astrophysics, Vol.271, NO. 1/APRI, P. 36, 1993

Astronomy and Astrophysics

Astrophysics

62

Scientific paper

We investigate the magnetic fields above the discs of spiral galaxies in the framework of axisymmetric nonlinear mean-field dynamo models for a disc surrounded by a spherical halo, using realistic rotation curves. We consider, in particular, NGC 4631 and NGC 891, and include turbulent diamagnetism, an anisotropy of the α effect and a galactic wind. In these model magnetic field is generated in a disc of scale height 1.5 kpc and distorted by the wind in the halo. For typical wind velocities of 50.. .200 km/s in the halo we find good qualitative agreement between the observed polarisation maps and those synthesised from the magnetic fields of our models: Poloidal synthesised fields dominate in the halo of NGC 4631, and horizontal fields in that of NGC 891. In some cases, a galactic wind can enhance dynamo action, contrary to previous expectations. Our results indicate that turbulent diamagnetism plays an important role in galactic dynamos.

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