3D global simulations of galactic magnetic fields and gas flows

Authors: Dziourkevitch, N.1; Elstner, D.2

Source: Astrophysics and Space Science, Volume 284, Number 2, 2003 , pp. 757-760(4)

Publisher: Springer

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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 non linear 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.

Keywords: gas flow; magnetic galactic fields; spiral galaxy

Document Type: Research Article

Affiliations: 1: Astrophysical Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany E-mail:nsd@aip.de 2: Astrophysical Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany E-mail:delstner@aip.de

Publication date: January 1, 2003

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