Forged in FIRE: cusps, cores, and baryons in low-mass dwarf galaxies

Understand

We present ultra-high resolution cosmological hydrodynamic simulations of $M_*\simeq10^{4-6.3}M_{\odot}$ dwarf galaxies that form within $M_{v}=10^{9.5-10}M_{\odot}$ dark matter halos.

• Our simulations rely on the FIRE implementation of star formation feedback and were run with high enough force and mass resolution to directly resolve stellar and dark matter structure on the ~200 pc scales of interest for classical and ultra-faint dwarfs in the Local Group.
• The resultant galaxies sit on the $M_*$ vs.
• $M_{v}$ relation required to match the Local Group stellar mass function.