Updated Constraints on the Injection Energy of Positrons Generating the Galactic 511 keV gamma-ray line

arXiv:2506.00847 · astro-ph.HE, astro-ph.GA, hep-ph · Submitted 2025-06-01 · Read on arXiv

astro-ph.HE, astro-ph.GA, hep-ph

Submitted: 2025-06-01

Updated: 2026-08-10

Comments: v2: 12+28 pages, 3+28 figures; Accepted for publication in Physical Review Letters

Journal ref: Phys. Rev. Lett. 137, 111003 (2026)

DOI: 10.1103/7v14-g7tf

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Inverse Compton — 11× in this paper
• Benchmark — 9× in this paper · explained in 2 episodes
• Abundance — 2× in this paper · explained in 1 episode
• Akaike Information Criterion — 1× in this paper
• Consistency — 1× in this paper · explained in 3 episodes
• Markov-Chain Monte Carlo — 1× in this paper

Sources

• Astrophysical constraints from gamma-ray spectroscopy
• The 511 keV emission from positron annihilation in the Galaxy
• Positron Annihilation in the Galaxy
• The Positron Puzzle
• Gamma-ray spectroscopy of Positron Annihilation in the Milky Way
• Early SPI/INTEGRAL contraints on the morphology of the 511 keV line emission in the 4th galactic quadrant
• The all-sky distribution of 511 keV electron-positron annihilation emission
• The sky distribution of positronium annihilation continuum emission measured with SPI/INTEGRAL
• On the intensity and spatial morphology of the 511 keV emission in the Milky Way
• On the morphology of the electron-positron annihilation emission as seen by SPI/INTEGRAL
• Diffuse Galactic antimatter from faint thermonuclear supernovae in old stellar populations
• Galactic Positrons from Thermonuclear Supernovae
• Positron transport in the interstellar medium
• The Galactic Positron Annihilation Radiation & The Propagation of Positrons in the Interstellar Medium
• Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation?
• Positron Annihilation in the Nuclear Outflows of the Milky Way
• Measuring the smearing of the Galactic 511 keV signal: positron propagation or supernova kicks?
• Importance of cosmic ray propagation on sub-GeV dark matter constraints
• Could electron-positron annihilation lines in the Galactic center result from pulsar winds?
• Cosmic Rays from Microquasars: a Narrow Component to the CR Spectrum?

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