Mathematics – Logic
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006an....327..433k&link_type=abstract
Astronomische Nachrichten, Vol.327, Issue 5/6, p.433
Mathematics
Logic
4
Galaxies: Magnetic Fields, Supernova Remnants, Methods: Numerical, Magnetohydrodynamics, Turbulence
Scientific paper
Observations of μG magnetic fields in radio galaxies at cosmological epochs as early as around z=2 have shortened the available time for dynamo action. This fact suggests that the mean-field dynamo mechanism in a global galactic scale either is too slow to amplify a seed field generated by the Biermann battery effect to the level of the observed field strength at z˜2 or needs much stronger seed fields of an order of 10-10 G. A ``contamination'' picture that amplified magnetic fields in smaller objects, such as stars or AGNs, within a relatively shorter timescale spread out through supernova ejecta, stellar winds, and AGN jets to nearby environments is gaining momentum. In line with this picture, we demonstrate, through three-dimensional numerical experiments, that magnetic fields can be amplified by supernova-driven turbulence with two orders of magnitude smaller e-folding timescale than that of the mean-field dynamo mechanism. Therefore, supernova-driven turbulence may play an important role in amplifying small-scale B-fields in any astrophysical systems that have harbored massive stars.
Balsara Dinshaw S.
Kim Jongsoo
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