Searching for Dark Matter Sub-structure with HAWC.

Simulations of dark mattershow a discrepancy between the expected number of Galactic dark mattersub- halosand how many have been optically observed. Some of these unseen satellites may exist as dark dwarf galaxies: sub- haloslike dwarf galaxieswith no luminous counterpart. Assuming WIMP dark matter, it may be possible to detect these unseen sub- halosfrom gamma-raysignals originating from dark matterannihilation. The High Altitude Water Cherenkov Observatory (HAWC) is a very high energy (500 GeV to 100 TeV) gamma raydetector with a wide field-of-view and near continuous duty cycle, making HAWC ideal for unbiased sky surveys. We perform such a search for gamma raysignals from dark dwarfsin the Milky Way halo. We perform a targeted search of HAWC gamma-raysources which have no known association with lower-energy counterparts, based on an unbiased search of the entire sky. With no sources found to strongly prefer dark mattermodels, we calculate the ability of HAWC to observe dark dwarfs. We also compute the HAWC sensitivity to potential future detections for a given model of dark mattersubstructure.