S317p.102 — Formation of galactic building blocks in cosmological hydrodynamic simulations

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Kyungwon Chun2, Jihye Shin1, Sungsoo S. Kim2

Institution(s): 1. Kavli Institute for Astronomy and Astrophysics, 2. Kyung Hee University

We aim to investigate the formation of primordial globular clusters (GCs) and dwarf galaxies as galactic building blocks in the Milky Way-like galaxy with cosmological zoom-in simulations. To accomplish our research goal, we modified cosmological hydrodynamic code, GADGET-2, such that it includes radiative heating and cooling, reionization (z < 8.9) of the Universe, UV shielding (nshield > 0.014cm-3), star formation, and supernova explosion. We first performed a dark matter(DM)-only, low resolution simulation with 32Mpc/h on a side to find the host halo (~10×1012 M), and then resimulated a cubic box of a side length 4Mpc/h with 130 million DM and gas particles from z = 49. The mass of each particle is Mdm = 3.4×104 Mand Mgas = 6.3×103 M, thus the GCs and dwarf galaxies can be resolved with more than hundreds and thousands particles, respectively. Here, we present various properties of the building blocks such as mass function, formation epochs, baryon-to-dark matter ratio, metallicity, spatial distribution, and merger history on the host halo as functions of redshift.