The distribution of annihilation luminosities in dark matter substructure

Abstract

We calculate the probability distribution function (PDF) of the expected annihilation luminosities of dark matter subhalos as a function of subhalo mass and distance from the Galactic center using a semi-analytical model of halo evolution. We find that the PDF of luminosities is relatively broad, exhibiting a spread of as much as an order of magnitude at fixed subhalo mass and halo-centric distance. The luminosity PDF allows for simple construction of mock samples of gamma-ray luminous subhalos and assessment of the variance in among predicted gamma-ray signals from dark matter annihilation. Other applications include quantifying the variance among the expected luminosities of dwarf spheroidal galaxies, assessing the level at which dark matter annihilation can be a contaminant in the expected gamma-ray signal from other astrophysical sources, as well as estimating the level at which nearby subhalos can contribute to the antimatter flux.

10 pages, 5 figures. Replaced with version accepted for publication in Phys. Rev. D

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• Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
• Bailing Out the Milky Way: Variation in the Properties of Massive Dwarfs Among Galaxy-Sized Systems
• Structure Formation Models Weaken Limits on WIMP Dark Matter from Dwarf Spheroidal Galaxies
• The Effects of Halo-to-Halo Variation on Substructure Lensing
• Harnessing the Population Statistics of Subhalos to Search for Annihilating Dark Matter
• Constraining Dark Matter Microphysics with the Annihilation Signal from Subhalos
• Approximate Bayesian Computation Applied to the Diffuse Gamma-ray Sky