Abstract
We investigate the effects of varying the intensity of the primordial
magnetic seed field on the global properties of the galaxy population in ideal
MHD cosmological simulations performed with the moving-mesh code AREPO. We vary
the seed field in our calculations in a range of values still compatible with
the current cosmological upper limits. We show that above a critical intensity
of $10^-9\,G$ the additional pressure arising from the field
strongly affects the evolution of gaseous structures, leading to a suppression
of the cosmic star formation history. The suppression is stronger for larger
seed fields, and directly reflects into a lower galaxy number density at fixed
stellar mass and a less massive stellar component at fixed virial mass at all
mass scales. These signatures may be used, in addition to the existing methods,
to derive tighter constraints on primordial magnetic seed field intensities.
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