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Linked Evolution of Gas and Star Formation in Galaxies Over Cosmic History

Linked Evolution of Gas and Star Formation in Galaxies Over Cosmic History

We compare the cosmic evolution of star formation rates in galaxies with that of their neutral hydrogen densities. We highlight the need for neutral hydrogen to be continually replenished from a reservoir of ionized gas to maintain the observed star formation rates in galaxies. Hydrodynamic simulations indicate that the replenishment …