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We present a new set of high-resolution hydrodynamic cosmological zoom-insimulations that apply the Feedback In Realistic Environments (FIRE) physics toboth Local Group (LG)-like and isolated Milky Way (MW)-like volumes (ten hostsystems in total with baryonic particle mass $\simeq 3,500-7,000\,M_\odot$). Westudy the stellar mass functions, circular velocity or mass profiles, andvelocity dispersions of the dwarf galaxy populations. The simulations reproducethe stellar mass function and central densities of MW satellite dwarfs for$M_\ast \geq10^{5.5}\,M_\odot$ and predict the existence of $\sim3$unidentified galaxies with $M_\ast\sim10^5\,M_\odot$ within $300$ kpc of theMW. Overall, we find no evidence for the classical missing satellites ortoo-big-to-fail (TBTF) problems for satellite galaxies in our sample. Among thesatellites, TBTF is resolved primarily by subhalo disruption and overall massloss; central density profiles of subhalos are of secondary importance. Fornon-satellite galaxies, our LG-like simulations predict as many as $\sim10$as-of-yet unseen galaxies at distances $0.3-1$ Mpc from both hosts, with$M_\ast\simeq10^{5-6}\,M_\odot$ (in halos with $V_\mathrm{max}\sim20~\mathrm{km\,s}^{-1}$), albeit with large halo-to-halo variance. None of oursimulations produces a compact, baryon-dominated, high-density dwarfelliptical-type galaxy (with $V_\mathrm{circ} \gtrsim 35~\mathrm{km\,s}^{-1}$at $r<1\,$kpc), of which six may appear in the LG (but none in the MW). It maytherefore remain a challenge to reproduce the full diversity of the dwarfpopulation, including both the highest and lowest density systems.

The Local Group on FIRE: Dwarf galaxy populations across a suite of hydrodynamic simulations