3D global simulations of galactic magnetic fields and gas flows |
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Authors: | N Dziourkevitch D Elstner |
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Institution: | (1) Astrophysical Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany |
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Abstract: | The evolution of three-dimensional (3D), dynamo excited galactic magnetic fields under the influence of a time-dependent gas
flow in spiral arms is already well investigated. Our principal goal is to check how the dynamo-driven turbulent magnetic
fields affect the gas flows. Numerical solutions of the full set of 3D MHD equations for dynamos in spiral galaxies are presented.
Further we try to investigate the nonlinear evolution of magnetic instabilities in a global galactic model. The model includes
differential rotation, eddy diffusivity and tensorial alpha-effect. In a first step the flow is driven by a prescribed gravitational
potential. The vertical density stratification and the radial-azimutal spiral pattern are taken closely to observational data.
We use a modified variant of the highly parallelized time-stepping ZeusMP code for the simulations of global galactic magnetic
fields and gas flows.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | magnetic galactic fields gas flow spiral galaxy |
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