Poster Presentation
Formation and evolution of extremely metal-poor dwarf galaxies
Presenter: Kazuki Tomaru (Osaka University)
Extremely metal-poor dwarf galaxies (EMPGs) are expected as local analogs of the first galaxies due to their significantly low gas-phase metallicity (Z <= 0.1 Z_sun). Hence they may provide a window into the star-formation processes in the early universe such as the accretion of primordial gas. However, observations also suggest the presence of other processes such as inefficient star formation, galactic winds expelling metals, as well as metal-poor accretion to explain the properties of EMPGs. In order to investigate the star formation of EMPGs and the origin of their low metal abundance, we perform simulations of EMPGs using cosmological smoothed particle hydrodynamics code GADGET3-Osaka. In this work, we examine gas outflows and inflows and the star formation history of EMPGs. We successfully produce EMPGs in our zoom-in cosmological hydrodynamic simulation in isolated environments, and the simulated EMPGs have continuous net mass inflow with increasing star formation when they evolve secularly.
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