Sources of magnetic fields appear in this universe - which just samples the first ~1/10 of evolution of a big 2048^3 simulations running on LEONARDO at CINECA (using a customised version of the ENZO code), and it just samples a thin slice through the simulation.
Magnetic field strength on the left, gas density on the right.
The injection of magnetic fields here only follows the onset of star formation (and later on of active galactic nuclei).
