Galactic Substructure and Dark Matter Annihilation in the Milky Way Halo

Abstract

We study the effects of substructure on the rate of dark-matter annihilation in the Galactic halo. We use an analytic model for substructure that can extend numerical simulation results to scales too small to be resolved by the simulations. We first calibrate the analytic model to numerical simulations, and then determine the annihilation boost factor, for standard WIMP models as well as those with Sommerfeld (or other) enhancements, as a function of Galactocentric radius in the Milky Way. We provide an estimate of the dependence of the gamma-ray intensity of WIMP annihilation as a function of angular distance from the Galactic center. This methodology, coupled with future numerical simulation results can be a powerful tool that can be used to constrain WIMP properties using Fermi all-sky data.

10 pages, 7 figures, submitted to Phys. Rev. D; added a few references

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Cited by in corpus (29)

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• The Sensitivity of HAWC to High-Mass Dark Matter Annihilations
• Superdense cosmological dark matter clumps
• Multipole analysis of IceCube data to search for dark matter accumulated in the Galactic halo
• The cosmic X-ray and gamma-ray background from dark matter annihilation
• Neutrinos in IceCube/KM3NeT as probes of Dark Matter Substructures in Galaxy Clusters
• Amplified J-factors in the Galactic Center for velocity-dependent darkmatter annihilation in FIRE simulations
• Prompt cusps and the dark matter annihilation signal
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• Running with BICEP2: Implications for Small-Scale Problems in CDM
• Probing dark matter models with neutrinos from the Galactic center
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• Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S
• Future sensitivity of neutrino telescopes to dark matter annihilations from the cosmic diffuse neutrino signal
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• Updated constraints on WIMP dark matter annihilation by radio observations of M31
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• Search for heavy dark matter from dwarf spheroidal galaxies: leveraging cascades and subhalo models
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• LHAASO Galactic Plane $\gamma$-rays Strongly Constrain Heavy Dark Matter
• Updated Constraints on the Injection Energy of Positrons Generating the Galactic 511 keV $\gamma$-ray line