http://arxiv.org/abs/1702.05266
A few new dwarf spheroidal satellites (dSphs) were discovered by the Dark Energy Survey (DES). These dSphs provide new candidates for gamma-ray emission search from dark matter annihilation. These candidates have been surveyed by the Fermi-LAT, but no significant gamma-ray signature has been found, except only slight excess from some new dSphs. Reticulum II is one of such objects. In the work we reanalyze the Fermi-LAT about 7-years data at the direction of Reticulum II. In our analysis we model Reticulum II as a spatially-extended source, with different degrees of extension. We find different spatial extension may result in different TS values. But no significant gamma-ray signature over background is found in our analysis. Then we give the upper limits on the dark matter annihilation cross section from Fermi-LAT observation.
Y. Zhao, X. Bi, P. Yin, et. al.
Mon, 20 Feb 17
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