9-13 September 2019
University of Geneva A100 Sciences II
Europe/Zurich timezone

Connecting the first galaxies with ultra faint dwarfs in the Local Group

12 Sep 2019, 11:00


Prof. Jeon Myoungwon (Korea)


We investigate the star formation histories and chemical evolution of isolated analogs of Local Group untra-faint dwarf galaxies (UFDs) and gas-rich, low-mass dwarfs. We perform a suite of cosmological hydrodynamic zoom-in simulations to follow their evolution from the era of the first generation of stars down to z = 0. We confirm that reionization, combined with supernova (SN) feedback, is primarily responsible for the truncated star formation in UFDs.
In this talk, we will show the importance of Population III stars, with their intrinsically high Carbon yields and the external metal enrichment, in producing low-metallicity stars and carbon-enhanced metal-poor (CEMP) stars. We will also discuss whether the progenitors of local, gas-rich dwarf galaxies (M_star ~ 10^6 solar mass) could possibly be detected as Damped Lyman-alpha Absorbers (DLAs) over cosmic time. Specifically, since we explicitly consider the contribution of heavy element enrichment from the first stars to the build-up of metals in dwarf galaxies, we can test the scenario that very metal-poor DLAs could contain the unique signature of Pop~III nucleosynthesis.

Primary author

Prof. Jeon Myoungwon (Korea)

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