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Dark matter debris flows in the Milky Way

Author(s): Lisanti, Mariangela; Spergel, David N.

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Abstract: We show that subhalos falling into the Milky Way create a flow of tidally-stripped debris particles near the Galactic center with characteristic speed behavior, but no spatial features. Using the Via Lactea-II N-body simulation, we study the unvirialized component arising from particles that were bound in subhalos around the time of reionization but have since been tidally stripped. These debris particles constitute a few percent of the local density today and have speeds peaked at 340 km/s in the solar neighborhood. This spatially-homogeneous 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. © 2012 Elsevier B.V.
Publication Date: Nov-2012
Electronic Publication Date: 8-Nov-2012
Citation: Lisanti, M, Spergel, DN. (2012). Dark matter debris flows in the Milky Way. Physics of the Dark Universe, 1 (1-2), 155 - 161. doi:10.1016/j.dark.2012.10.007
DOI: doi:10.1016/j.dark.2012.10.007
ISSN: 2212-6864
Pages: 155 - 161
Type of Material: Journal Article
Journal/Proceeding Title: Physics of the Dark Universe
Version: Final published version. This is an open access article.

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