Milky Way Satellite Census. III. Constraints on Dark Matter Properties from Observations of Milky Way Satellite Galaxies. (arXiv:2008.00022v1 [astro-ph.CO])

Milky Way Satellite Census. III. Constraints on Dark Matter Properties from Observations of Milky Way Satellite Galaxies. (arXiv:2008.00022v1 [astro-ph.CO])
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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 ($mathit{i}$) the mass of thermal relic warm
DM, $m_{rm WDM} > 6.5 mathrm{keV}$ (free-streaming length,
$lambda_{rm{fs}} lesssim 10,h^{-1} mathrm{kpc}$), ($mathit{ii}$) the
velocity-independent DM$-$proton scattering cross section, $sigma_{0} <
8.8times 10^{-29} mathrm{cm}^{2}$ for a $100 mathrm{MeV}$ DM particle mass
(DM$-$proton coupling, $c_p lesssim (0.3 mathrm{GeV})^{-2}$), and
($mathit{iii}$) the mass of fuzzy DM, $m_{phi}> 2.9 times 10^{-21}
mathrm{eV}$ (de Broglie wavelength, $lambda_{rm{dB}} lesssim 0.5
mathrm{kpc}$). These constraints are complementary to other observational and
laboratory constraints on DM properties.

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