Oral Presentation
Formation of the First Galaxies
Presenter: Li-Hsin Chen (National Taiwan University/ Institute of Astronomy and Astrophysics, Academia Sinica)
Modern cosmological simulations suggest that the hierarchical assembly of dark
matter halos provided the gravitational wells that allowed 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.
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