The failure of NPTF to recover injected dark matter signals can be a natural consequence of unresolved point sources and diffuse background mismodeling, so it does not by itself invalidate the NPTF point-source interpretation.
Young Pulsars and the Galactic Center GeV Gamma-ray Excess
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Studies of Fermi data indicate an excess of GeV gamma rays around the Galactic center (GC), possibly due to dark matter. We show that young gamma-ray pulsars can yield a similar signal. First, a high concentration of GC supernovae naturally leads to a population of kicked pulsars symmetric about the GC. Second, while very-young pulsars with soft spectra reside near the Galactic plane, pulsars with spectra that have hardened with age accumulate at larger angles. This combination, including unresolved foreground pulsars, traces the morphology and spectrum of the Excess.
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Characterizing the Nature of the Unresolved Point Sources in the Galactic Center
The failure of NPTF to recover injected dark matter signals can be a natural consequence of unresolved point sources and diffuse background mismodeling, so it does not by itself invalidate the NPTF point-source interpretation.