STUDYING DARK MATTER/BARYON INTERACTIONS AND THEIR EFFECTS ON THE DISTRIBUTION OF MASS IN GALAXIES
Cam Trujillo1, Jillian Bellovary2.
1Humboldt State University, Arcata, CA, 2Vanderbilt University, Nashville, TN.
We investigated the time development of a previously studied sample of a cosmological, high-resolution, smooth-particle-hydrodynamic N-body simulation, including a Milky-Way-like galaxy and several dwarf galaxies. For the first time, using a novel nonparametric approach to calculate dark matter halo concentrations in cosmological simulations, we addressed the cusp vs. core discrepancy between dark-matter-only simulations and those containing baryonic matter. Comparing the time-evolution of the parametrically derived DM-halo concentration with the time-evolution of the inner slope of the DM-density profile, and cross referencing it with new values for concentration calculated in volume space, we have gained new insight into the development of cores. There seems to be an interesting correlation between the inner slope of the density profile and the unique DM-halo concentration calculated in volume space. Their values and their progressions were shown in most cases to differ significantly from those calculated parametrically. Further research into these differences and their implications is certainly needed.