Constraints on Dark Matter Microphysics from the Milky Way Satellite Population

Nadler, Ethan O.; Gluscevic, Vera; Boddy, Kimberly K.; Wechsler, Risa H.

doi:10.3847/2041-8213/ab1eb2

Title: Constraints on Dark Matter Microphysics from the Milky Way Satellite Population

Journal Article · 17 June 2019 · The Astrophysical Journal. Letters (Online)

DOI: https://doi.org/10.3847/2041-8213/ab1eb2 · OSTI ID:1530595

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Stanford Univ., Stanford, CA (United States)
Univ. of Southern California, Los Angeles, CA (United States); Princeton Univ., Princeton, NJ (United States)
Johns Hopkins Univ., Baltimore, MD (United States)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Alternatives to the cold, collisionless dark matter (DM) paradigm in which DM behaves as a collisional fluid generically suppress small-scale structure. Herein we use the observed population of Milky Way (MW) satellite galaxies to constrain the collisional nature of DM, focusing on DM–baryon scattering. We first derive conservative analytic upper limits on the velocity-independent DM–baryon scattering cross section by translating the upper bound on the lowest mass of halos inferred to host satellites into a characteristic cutoff scale in the linear matter power spectrum. We then confirm and improve these results through a detailed probabilistic inference of the MW satellite population that marginalizes over relevant astrophysical uncertainties. This yields 95% confidence upper limits on the DM–baryon scattering cross section of 6 × 10^–30 cm² (10^–27 cm²) for DM particle masses m_χ of 10 keV (10 GeV); these limits scale as m_χ^1/4 for m_χ << 1 GeV and m_χ for m_χ >> 1 GeV. This analysis improves upon cosmological bounds derived from cosmic-microwave-background anisotropy measurements by more than three orders of magnitude over a wide range of DM masses, excluding regions of parameter space previously unexplored by other methods, including direct-detection experiments. Lastly, our work reveals a mapping between DM–baryon scattering and other alternative DM models, and we discuss the implications of our results for warm and fuzzy DM scenarios.

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Research Organization:: Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1530595

Journal Information:: The Astrophysical Journal. Letters (Online), Vol. 878, Issue 2; ISSN 2041-8213

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 101 works

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