Constraints on Dark Matter Microphysics from the Milky Way Satellite Population

被引：124

作者：

Nadler, Ethan O. ^{[1
,2
]}

Gluscevic, Vera ^{[3
,4
]}

Boddy, Kimberly K. ^{[5
]}

Wechsler, Risa H. ^{[1
,2
,6
]}

机构：

[1] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[3] Univ Southern Calif, Dept Phys & Astron, Los Angeles, CA 90089 USA

[4] Princeton Univ, Joseph Henry Labs Phys, Jadwin Hall, Princeton, NJ 08544 USA

[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[6] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 878卷 / 02期

关键词：

cosmology: theory; dark matter; galaxies: halos; methods: numerical; MASS; HALOES; GALAXY;

D O I：

10.3847/2041-8213/ab1eb2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 x 10(-30) cm(2) (10(-27) cm(2)) for DM particle masses m(chi) of 10 keV (10 GeV); these limits scale as M-chi(1/4) for m(chi) << 1 GeV and m(chi) for m(chi) >> 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. 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.

引用

页数：6

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