Hotspots in the Galactic 511 keV map may include contributions from the Magellanic Stream, Complex C, and Local Volume Galaxies, pointing to a Milky Way positron production rate of 10^44 s^{-1} and a small but potentially detectable cosmological background contribution.
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On the Possibility of an Extragalactic Positron Annihilation Signal
Hotspots in the Galactic 511 keV map may include contributions from the Magellanic Stream, Complex C, and Local Volume Galaxies, pointing to a Milky Way positron production rate of 10^44 s^{-1} and a small but potentially detectable cosmological background contribution.