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511 keV line 1cosmic photon background 1cosmological redshift evolution 1galactic center 1gamma-ray astronomy 1gamma-ray background 1inverse Compton scattering 1pair production 1positron annihilation 1positron production 1stellar flares 1

From the 2 of 12 linked papers with an AI index.

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20242026
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astro-ph.GA2026

Stellar flares cannot explain the Galactic 511 keV emission

Saurabh Mittal, Thomas Siegert, Francesca Calore +12

The authors assess whether stellar flares can produce enough positrons to explain the Milky Way’s 511 keV annihilation line and conclude that flares fall short by several orders of…