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We present a search for gamma-ray emission from the direction of the newlydiscovered dwarf galaxy Reticulum II. Using Fermi-LAT data, we detect a signalthat exceeds expected backgrounds between ~2-10 GeV and is consistent withannihilation of dark matter for particle masses less than a few x 10^2 GeV.Modeling the background as a Poisson process based on Fermi-LAT diffuse models,and taking into account trials factors, we detect emission with p-value lessthan 9.8 x 10^-5 (>3.7 sigma). An alternative, model-independent treatment ofbackground reduces the significance, raising the p-value to 9.7 x 10^-3 (2.3sigma). Even in this case, however, Reticulum II has the most significantgamma-ray signal of any known dwarf galaxy. If Reticulum II has a dark matterhalo that is similar to those inferred for other nearby dwarfs, the signal isconsistent with the s-wave relic abundance cross section for annihilation.

Indication of Gamma-ray Emission from the Newly Discovered Dwarf Galaxy Reticulum II