A Possible Mechanism for Generating Galactic Magnetic Fields

Details A Possible Mechanism for Generating Galactic Magnetic Fields A Possible Mechanism for Generating Galactic Magnetic Fields

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...540..755d&link_type=abstract

The Astrophysical Journal, Volume 540, Issue 2, pp. 755-764.

Astronomy and Astrophysics

Astronomy

38

Galaxies: Formation, Galaxies: Magnetic Fields, Hydrodynamics, Methods: N-Body Simulations

Scientific paper

We demonstrate that the Biermann battery mechanism for the creation of large-scale magnetic fields can arise in a simple model protogalaxy. Analytic calculations and numerical simulations follow explicitly the generation of vorticity (and hence magnetic field) at the outward-moving shock that develops as the protogalactic perturbation collapses. Shear angular momentum then distorts this field into a dipole-like configuration. The magnitude of the field created in the fully formed disk galaxy is estimated to be 10-17 G, approximately what is needed as a seed for the galactic dynamo.

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