The structure of magnetic fields around a Milky Way-like galaxy, seen edge-on, from the TNG50 cosmological simulation. The background images show a slice of the Voronoi mesh colored by gas density, through the midpoint of the disk (from blue to white). The black streamlines visualize the direction of the magnetic vector field, which in this case has been decomposed into bulk (left) and small-scale i.e. turbulent (right) components, using a multi-scale decomposition technique.

Methods: AREPO code