Dark Matter Debris Flows in the Milky Way
Cosmology and Nongalactic Astrophysics
2013-01-03 v3 High Energy Physics - Phenomenology
Abstract
We show that subhalos falling into the Milky Way create a flow of tidally-stripped debris particles near the galactic center with characteristic velocity behavior. In the Via Lactea-II N-body simulation, this unvirialized component constitutes a few percent of the local density and has velocities peaked at 340 km/s in the solar neighborhood. Such velocity substructure has important implications for surveys of low-metallicity stars, as well as direct detection experiments sensitive to dark matter with large scattering thresholds.
Cite
@article{arxiv.1105.4166,
title = {Dark Matter Debris Flows in the Milky Way},
author = {Mariangela Lisanti and David N. Spergel},
journal= {arXiv preprint arXiv:1105.4166},
year = {2013}
}
Comments
4 pages, 3 figures; v2 includes new plots illustrating the radial and tangential velocities of non-debris particles; v3 includes some additional minor edits