Motivated by the observed bottom-light initial mass function (IMF) in faint dwarfs, we study
how a metallicity-dependent IMF affects the feedback budget and observables of an ultra-
faint dwarf galaxy. We model the evolution of a low-mass () dark matter halo with
cosmological, zoomed hydrodynamical simulations capable of resolving individual
supernovae explosions, which we complement with an empirically motivated subgrid
prescription for systematic IMF variations. In this framework, at the low gas metallicities …