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Galactic dynamo simulations

Published online by Cambridge University Press:  01 November 2008

Detlef Elstner ,
Oliver Gressel  and
Günther Rüdiger
Detlef Elstner
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: elstner@aip.de
Oliver Gressel
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: elstner@aip.de
Günther Rüdiger
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: elstner@aip.de
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Abstract

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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.

Keywords

ISM: magnetic fields – galaxies: magnetic fields

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