Stringent Constraint on Galactic Positron Production

Details Stringent Constraint on Galactic Positron Production Stringent Constraint on Galactic Positron Production

2005-12-15

arxiv.org/abs/astro-ph/0512411v2

Phys.Rev.Lett.97:071102,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; minor revisions, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.97.071102

The intense 0.511 MeV gamma-ray line emission from the Galactic Center observed by INTEGRAL requires a large annihilation rate of nonrelativistic positrons. If these positrons are injected at even mildly relativistic energies, higher-energy gamma rays will also be produced. We calculate the gamma-ray spectrum due to inflight annihilation and compare to the observed diffuse Galactic gamma-ray data. Even in a simplified but conservative treatment, we find that the positron injection energies must be $\lesssim 3$ MeV, which strongly constrains models for Galactic positron production.

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