Proceedings of the International Astronomical Union

Contributed Papers

Galactic dynamo simulations

Detlef Elstnera1, Oliver Gressela1 and Günther Rüdigera1

a1 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: elstner@aip.de

Abstract

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