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- W12687220 abstract "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 models 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" @default.
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- W12687220 date "1993-04-01" @default.
- W12687220 modified "2023-09-23" @default.
- W12687220 title "Vertical magnetic fields above the discs of spiral galaxies." @default.
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