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In a previous paper, we pointed out that the gamma-ray source 3FGLJ2212.5+0703 shows evidence of being spatially extended. If a gamma-ray sourcewithout detectable emission at other wavelengths were unambiguously determinedto be spatially extended, it could not be explained by known astrophysics, andwould constitute a smoking gun for dark matter particles annihilating in anearby subhalo. With this prospect in mind, we scrutinize the gamma-rayemission from this source, finding that it prefers a spatially extended profileover that of a single point-like source with 5.1 sigma statisticalsignificance. We also use a large sample of active galactic nuclei and otherknown gamma-rays sources as a control group, confirming, as expected, thatstatistically significant extension is rare among such objects. We argue thatthe most likely (non-dark matter) explanation for this apparent extension is apair of bright gamma-ray sources that serendipitously lie very close to eachother, and estimate that there is a chance probability of ~2% that such a pairwould exist somewhere on the sky. In the case of 3FGL J2212.5+0703, a modelwith a second gamma-ray point source at the location of a known BZCAT/CRATESradio source yields fits that are comparable in quality to those obtained for asingle extended source. If 3FGL J2212.5+0703 is a dark matter subhalo, it wouldimply that dark matter particles have a mass of ~18-33 GeV and an annihilationcross section on the order of sigma v ~ 10^-26 cm^3/s (for the representativecase of annihilations to bb), similar to the values required to generate theGalactic Center gamma-ray excess.

Is The Gamma-Ray Source 3FGL J2212.5+0703 A Dark Matter Subhalo?