Search for gamma-ray emission from eight dwarf spheroidal galaxy candidates discovered in Year Two of Dark Energy Survey with Fermi-LAT data

Abstract

Very recently the Dark Energy Survey (DES) Collaboration has released their second group of Dwarf spheroidal (dSph) galaxy candidates. With the publicly-available Pass 8 data of Fermi-LAT we search for $\gamma -$ray emissions from the directions of these eight newly discovered dSph galaxy candidates. No statistically significant $\gamma -$ray signal has been found in the combined analysis of these sources. With the empirically estimated J-factors of these sources, the constraint on the annihilation channel of $\chi \chi \to {\tau }^{+}{\tau }^{-}$ is comparable to the bound set by the joint analysis of fifteen previously known dSphs with kinematically constrained J-factors for the dark matter mass $m_{\chi }>250$ GeV. In the direction of Tucana III (DES J2356-5935), one of the nearest dSph galaxy candidates that is $\sim 25$ kpc away, there is a weak $\gamma -$ray signal and its peak test statistic (TS) value for the dark matter annihilation channel $\chi \chi \to {\tau }^{+}{\tau }^{-1}$ is $\approx 6.7$ at $m_{\chi }\sim 15$ GeV. The significance of the possible signal likely increases with time. More data is highly needed to pin down the physical origin of such a GeV excess.

arXiv commentTo appear in Phys. Rev. D, Fig.4 has been updated and main conclusions are unchanged

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