Galactic dynamo simulations

Details Galactic dynamo simulations Galactic dynamo simulations

2009-01-30

arxiv.org/abs/0901.4929v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 5 figures, IAU Symp. 259 proceedings (in press)

Scientific paper

10.1017/S1743921309031135

Recent simulations of supernova-driven turbulence within the ISM support the existence of a large-scale dynamo. With a growth time of about two hundred million years, the dynamo is quite fast -- in contradiction to many assertions in the literature. We here present details on the scaling of the dynamo effect within the simulations and discuss global mean-field models based on the adopted turbulence coefficients. The results are compared to global simulations of the magneto-rotational instability.

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