Positron Annihilations at the Galactic Center: Stringent Constraint on Positron Injection Energies

Details Positron Annihilations at the Galactic Center: Stringent Constraint on Positron Injection Energies Positron Annihilations at the Galactic Center: Stringent Constraint on Positron Injection Energies

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jphcs..60..255y&link_type=abstract

Journal of Physics: Conference Series, Volume 60, Issue 1, pp. 255-258 (2007).

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. The emission is strongly concentrated at the Galactic Center (GC), in contrast to gamma-ray maps tracing nucleosynthesis (e.g., the 1.809 MeV line from decaying 26Al) or cosmic ray processes (e.g., the 1-30 MeV continuum), which reveal a bright disk with a much less prominent central region. If positrons are generated at relativistic energies, higher-energy gamma rays will also be produced from inflight annihilation of positrons on ambient electrons. The comparison of the gamma-ray spectrum from inflight annihilation to the observed diffuse Galactic gamma-ray data constrains the injection energies of Galactic positrons to be less than 3 MeV.

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