Li-Hsin Chen (NTU/ASIAA); Ke-Jung Chen (ASIAA)
Modern cosmological simulations suggest that the hierarchical assembly of dark matter halos provide the gravitational wells that allow the primordial gases to form stars and galaxies inside them. The first galaxies comprised of the first systems of stars gravitationally bound in dark matter halos are naturally recognized as the building blocks of early Universe. To understand the formation of the first galaxies, we use an adaptive mesh refinement cosmological code, ENZO, to simulate the formation and evolution of the first galaxies. We first model an isolated galaxy by considering much microphysics such as star formation, stellar feedback, and primordial gas cooling. To examine the effect of Pop III stellar feedback to the first galaxy formation, we adjust the initial temperature and metallicity distributions based on the IMF of the first stars. Our results suggest that star formation in the first galaxies is sensitive to the initial metallicity/density/temperature distribution from the first supernovae. Our study can help to correlate the populations of the first stars and supernovae to star formation inside these first galaxies which may be soon observed by the JWST.