Event Details

We apply the Jeans equation to identify subhalos in highresolution numerical simulations that are potentially consistent with observed properties of Milky Way dwarf spheroidal (dSph) galaxies. We investigate the effects found by several recent studies that show changes to the dynamical properties of galactic substructure: the properties of dark matter (DM), and galaxy formation physics. For those subhalos that we found to provide reasonable fits to the high-quality photometric and kinematic data, they exhibit different properties at present time (e.g. maximum-circular velocity, mass, stellar orbits) and different formation history among the different scenarios that we consider here. Thus those different scenarios provide unique signatures that can be further tested by future surveys. We also examine the possibility of matching the observed dSph luminosity with predicted kinematic properties simultaneously by abundance matching methods and hydrodynamical simulations. These results show that each MW dSphs has had a different star formation history, and these must be understood in concert with DM properties and galaxy formation to better understand the puzzles on sub-galactic scales.