Local Group Dwarf Galaxies: Nature And Nurture
Till Sawala, Cecilia Scannapieco, Simon White

TL;DR
This study uses high-resolution cosmological simulations to analyze the formation, evolution, and gas content of dwarf galaxies, revealing mass-dependent processes affecting their star formation and gas retention.
Contribution
It provides a detailed simulation-based analysis of dwarf galaxy evolution, highlighting the roles of mass, environment, and specific mechanisms in gas loss and morphological transformation.
Findings
95% of satellite galaxies are gas-free at z=0
Gas loss mechanisms include supernova feedback, tidal stripping, and re-ionization
Mass determines star formation, metal enrichment, and gas retention
Abstract
We investigate the formation and evolution of dwarf galaxies in a high resolution, hydrodynamical cosmological simulation of a Milky Way sized halo and its environment. Our simulation includes gas cooling, star formation, supernova feedback, metal enrichment and UV heating. In total, 90 satellites and more than 400 isolated dwarf galaxies are formed in the simulation, allowing a systematic study of the internal and environmental processes that determine their evolution. We find that 95% of satellite galaxies are gas-free at z=0, and identify three mechanisms for gas loss: supernova feedback, tidal stripping, and photo-evaporation due to re-ionization. Gas-rich satellite galaxies are only found with total masses above ~ 5x10^9 solar masses. In contrast, for isolated dwarf galaxies, a total mass of ~ 10^9 solar masses constitutes a sharp transition; less massive galaxies are predominantly…
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