Magnetic fields in the first galaxies: Dynamo amplification and limits   from reionization
  We discuss the amplification of magnetic fields by the small-scale dynamo, a process that could efficiently produce strong magnetic fields in the first galaxies. In addition, we derive constraints on the primordial field strength from the epoch of reionization. 
Dominik R.G. Schleicher and Jennifer Schober and Christoph Federrath   and Francesco Miniati and Robi Banerjee and Ralf S. K...
astro-ph.CO