Constraints on dark matter properties from observations of Milky Way satellite galaxies

Nadler, E O, Drlica-Wagner, A, Bechtol, K, Mau, S, Wechsler, R H, Gluscevic, V, Boddy, K, Pace, A B, Li, T S, McNanna, M, Riley, A H, García-Bellido, J, Mao, Y Y, Green, G, Romer, A K, DES Collaboration, and others, (2021) Constraints on dark matter properties from observations of Milky Way satellite galaxies. Physical Review Letters, 126 (9). a091101. ISSN 0031-9007

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Abstract

We perform a comprehensive study of Milky Way (MW) satellite galaxies to constrain the fundamental properties of dark matter (DM). This analysis fully incorporates inhomogeneities in the spatial distribution and detectability of MW satellites and marginalizes over uncertainties in the mapping between galaxies and DM halos, the properties of the MW system, and the disruption of subhalos by the MW disk. Our results are consistent with the cold, collisionless DM paradigm and yield the strongest cosmological constraints to date on particle models of warm, interacting, and fuzzy dark matter. At 95% confidence, we report limits on (i) the mass of thermal relic warm DM, mWDM>6.5 keV (free-streaming length, λfs≲10h-1 kpc), (ii) the velocity-independent DM-proton scattering cross section, σ0<8.8×10-29 cm2 for a 100 MeV DM particle mass [DM-proton coupling, cp≲(0.3 GeV)-2], and (iii) the mass of fuzzy DM, mφ>2.9×10-21 eV (de Broglie wavelength, λdB≲0.5 kpc). These constraints are complementary to other observational and laboratory constraints on DM properties.

Item Type: Article
Keywords: DES Collaboration
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 31 Aug 2021 08:46
Last Modified: 31 Aug 2021 09:00
URI: http://sro.sussex.ac.uk/id/eprint/101354

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