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

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posted on 2023-06-10, 00:47 authored by E O Nadler, A Drlica-Wagner, K Bechtol, S Mau, R H Wechsler, V Gluscevic, K Boddy, A B Pace, T S Li, M McNanna, A H Riley, J García-Bellido, Y Y Mao, G Green, Kathy RomerKathy Romer, DES Collaboration, others
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, ?fs?10h-1 kpc), (ii) the velocity-independent DM-proton scattering cross section, s0<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, mf>2.9×10-21 eV (de Broglie wavelength, ?dB?0.5 kpc). These constraints are complementary to other observational and laboratory constraints on DM properties.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Physical Review Letters

ISSN

0031-9007

Publisher

American Physical Society

Issue

9

Volume

126

Article number

a091101

Event location

United States

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-08-31

First Open Access (FOA) Date

2021-08-31

First Compliant Deposit (FCD) Date

2021-08-27

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