A team led by Thomas Siegert has published a new 511 keV positron-annihilation sky map based on 20 years of INTEGRAL/SPI data. Hotspots appear at high galactic latitudes coinciding with the Magellanic Stream, Complex C, and nearby galaxy groups — suggesting the Milky Way may be producing positrons at 2 to 3 times prior estimates.
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, suggests the Milky Way may be producing positrons at 2 to 3 times previously estimated rates, and that extragalactic annihilation could contribute meaningfully to the cosmic MeV gamma-ray background. NASA's COSI mission (2027) will test the result.){kind=link}