Göttingen 2025 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 14: Astrophysics II

EP 14.4: Vortrag

Freitag, 4. April 2025, 11:45–12:00, ZHG101

MHD simulations of turbulent galactic outflows — •Jens Kleimann and Horst Fichtner — Theoretische Physik IV, Ruhr-Universität Bochum, Germany

Simulations of the wind-filled halos of starburst galaxies are performed in the framework of magnetohydrodynamics (MHD), suitably extended to track additional turbulence-related quantities. These quantities comprise the turbulent energy density, the cross-helicity, and the turbulent correlation length scale. First, the occurrence of an unexpected large-scale hydrodynamic flow instability, the cause of which can be linked to the galaxy's mass, is described and discussed. The full system of equations is then solved for a typical lower-mass galaxy until a steady state is reached. The talk concludes with an analysis of the resulting turbulent properties within the galactic halo and a quantification of the associated particle diffusion parallel and perpendicular to the large-scale magnetic field.

Keywords: Magnetohydrodynamics; Galaxies; Turbulence; Outflows; Simulation