Supernova-driven interstellar turbulence and the galactic dynamo

Details Supernova-driven interstellar turbulence and the galactic dynamo Supernova-driven interstellar turbulence and the galactic dynamo

2011-01-20

arxiv.org/abs/1101.3976v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

7 pages, 2 figures, conference proceedings of the IAU Symposium 274, Advances in Plasma Astrophysics

Scientific paper

The fractal shape and multi-component nature of the interstellar medium together with its vast range of dynamical scales provides one of the great challenges in theoretical and numerical astrophysics. Here we will review recent progress in the direct modelling of interstellar hydromagnetic turbulence, focusing on the role of energy injection by supernova explosions. The implications for dynamo theory will be discussed in the context of the mean-field approach. Results obtained with the test field-method are confronted with analytical predictions and estimates from quasilinear theory. The simulation results enforce the classical understanding of a turbulent Galactic dynamo and, more importantly, yield new quantitative insights. The derived scaling relations enable confident global mean-field modelling.

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