Empirical Determination of Dark Matter Velocities Using Metal-Poor Stars

Herzog-Arbeitman, Jonah; Lisanti, Mariangela; Madau, Piero; Necib, Lina

doi:10.1103/physrevlett.120.041102

Empirical Determination of Dark Matter Velocities Using Metal-Poor Stars

Journal Article · Wed Jan 24 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.120.041102· OSTI ID:1541274

Herzog-Arbeitman, Jonah ^[1]; Lisanti, Mariangela ^[2]; Madau, Piero ^[3]; Necib, Lina ^[4]

Princeton University, NJ (United States); DOE/OSTI
Princeton University, NJ (United States)
University of California, Santa Cruz, CA (United States); Sorbonne University, Paris (France)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

The Milky Way dark matter halo is formed from the accretion of smaller subhalos. These sub-units also harbor stars—typically old and metal-poor—that are deposited in the Galactic inner regions by disruption events. In this report, we show that the dark matter and metal-poor stars in the Solar neighborhood share similar kinematics due to their common origin. Using the high-resolution eris simulation, which traces the evolution of both the dark matter and baryons in a realistic Milky Way analog galaxy, we demonstrate that metal-poor stars are indeed effective tracers for the local, virialized dark matter velocity distribution. The local dark matter velocities can therefore be inferred from observations of the stellar halo made by the Sloan Digital Sky Survey within 4 kpc of the Sun. This empirical distribution differs from the standard halo model in important ways and suggests that the bounds on the spin-independent scattering cross section may be weakened for dark matter masses below ~10 GeV. Data from Gaia will allow us to further refine the expected distribution for the smooth dark matter component, and to test for the presence of local substructure.

View Accepted Manuscript (DOE)

Research Organization:: Princeton University, NJ (United States)

Sponsoring Organization:: Alfred P. Sloan Foundation; Fondation de l’Ecole Normale Sup´erieure; USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0007968

OSTI ID:: 1541274

Alternate ID(s):: OSTI ID: 1417934

Report Number(s):: MIT--CTP/4899

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 120; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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