Stringent Constraint on Galactic Positron Production

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

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..apr.w7003b&link_type=abstract

American Physical Society, APS April Meeting, April 22-26, 2006, abstract #W7.003

Physics

Scientific paper

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 3 MeV, which strongly constrains models for Galactic positron production, especially dark matter annihilation.

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