How primordial magnetic fields shrink galaxies

摘要: As one of the prime contributors to interstellar medium energy budget, magnetic fields naturally play a part in shaping evolution galaxies. Galactic can originate from strong primordial provided these latter remain below current observational upper limits. To understand how such would affect global morphological and dynamical properties galaxies, we use suite high-resolution constrained transport magneto-hydrodynamic cosmological zoom simulations where vary initial field strength configuration along with prescription for stellar feedback. We find that delay onset star formation drain rotational support galaxy, diminishing radial size galactic disk driving higher amount gas towards centre. This is also reflected mock UVJ observations by an increase light profile concentration galaxy. explore possible mechanisms behind reduction angular momentum, focusing on braking. Finally, noticing effects are amplified presence feedback, briefly discuss whether changes measure be expected non-primordial origin.