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Among the most stringent constraints on the dark matter annihilation crosssection are those derived from observations of dwarf galaxies by the FermiGamma-Ray Space Telescope. As current (e.g., Dark Energy Survey, DES) andfuture (Large Synoptic Survey Telescope, LSST) optical imaging surveys discovermore of the Milky Way's ultra-faint satellite galaxies, they may increaseFermi's sensitivity to dark matter annihilations. In this study, we use asemi-analytic model of the Milky Way's satellite population to predict thecharacteristics of the dwarfs likely to be discovered by DES and LSST, andproject how these discoveries will impact Fermi's sensitivity to dark matter.While we find that modest improvements are likely, the dwarf galaxiesdiscovered by DES and LSST are unlikely to increase Fermi's sensitivity by morethan a factor of ~2-4. However, this outlook may be conservative, given thatour model underpredicts the number of ultra-faint galaxies with large potentialannihilation signals actually discovered in the Sloan Digital Sky Survey. Oursimulation-based approach focusing on the Milky Way satellite populationdemographics complements existing empirically-based estimates.

Prospects for Detecting Gamma Rays from Annihilating Dark Matter in Dwarf Galaxies in the Era of DES and LSST