Constraints on Dark Matter Properties from Observations of Milky Way Satellite Galaxies

Nadler, E O and Drlica-Wagner, A and Bechtol, K and Desai, Shantanu et. al. (2021) Constraints on Dark Matter Properties from Observations of Milky Way Satellite Galaxies. Physical Review Letters, 126 (091101). ISSN 0031-9007

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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.

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanu
Item Type: Article
Uncontrolled Keywords: Dark Matter,Rutherford backscattering spectroscopy, Satellites, Uncertainty analysis, Collisionless, De Broglie wavelength, Fundamental properties, Inhomogeneities
Subjects: Physics
Physics > Classical mechanics
Physics > Astronomy Astrophysics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 29 May 2021 10:57
Last Modified: 29 May 2021 10:57
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