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Updated Constraints on the Injection Energy of Positrons Generating the Galactic 511 keV $γ$-ray line
Even 50 years after the discovery of a positron annihilation line from the inner Galaxy, no class of astrophysical sources has emerged as a definitive explanation for both the emission morphology and flux. Positrons produced by dark matter annihilation or decay have been proposed, but the mass of an
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