We study the density structures of dark matter subhalos for both cold dark matter and self-interacting dark matter models using high-resolution cosmological N-body simulations. We quantify subhalo's central density at 150 pc from the center of each subhalo at the classical dwarf spheroidal and ultrafaint dwarf scales found in Milky-Way sized halos. By comparing them with observations, we find that the self-interacting scattering cross-section of σ/m<3cm2g−1 is favored. Due to the combination of hosts' tide and self-interactions, the central density of subhalos with small pericenter shows a noticeable difference between the cold and the self-interacting models, indicating that Milky-Way satellites with small pericenter are ideal sites to further constrain the nature of dark matter by future large spectroscopic surveys.
@article{arxiv.2107.05967,
title = {Constraining Self-Interacting Dark Matter with Dwarf Spheroidal Galaxies and High-resolution Cosmological $N$-body Simulations},
author = {Toshihiro Ebisu and Tomoaki Ishiyama and Kohei Hayashi},
journal= {arXiv preprint arXiv:2107.05967},
year = {2022}
}