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N-body simulations predict that galaxies at the Milky Way scale host a largenumber of dark matter (DM) subhalos. Some of these subhalos, if they aremassive enough or close enough to the Earth, might be detectable in $\gamma$rays due to the DM annihilation. 3FGL J2212.5+0703, an unidentified gamma-raysource, has been suggested to be the counterpart candidate of a DM subhalo byBertoni et al. (2015, 2016). In this work we analyze the Fermi-LAT Pass 8 dataof 3FGL J2212.5+0703 to independently test the DM subhalo hypothesis of thissource. In order to suppress the possible contamination from two nearbyvery-bright blazars, we just take into account the front-converting gamma-rayswhich have better angular resolutions than that of the back-converting photons.In addition to the spatial distribution analysis, we have extended the spectrumanalysis down to the energies of $\sim 100$ MeV, and thoroughly examined thevariability of the emission during the past 8 years. We confirm that 3FGLJ2212.5+0703 is a steady and spatially-extended gamma-ray emitter at a highconfidence level. The spectrum is well consistent with that expected from DMannihilation into $b\bar{b}$. The introduction of a phenomenologicalLogParabola spectrum just improves the fit slightly. All these results suggestthat 3FGL J2212.5+0703 could be indicative of a DM subhalo.

Testing the dark matter subhalo hypothesis of the gamma-ray source 3FGL J2212.5+0703