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Stringent constraint on galactic positron production.

John F Beacom1, Hasan Yüksel

  • 1Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.

Physical Review Letters
|October 10, 2006
PubMed
Summary
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Positron annihilation in the Galactic Center produces gamma rays. Our study shows positron injection energies must be below 3 MeV, constraining models of their production.

Area of Science:

  • Astrophysics
  • Particle Physics
  • Gamma-ray Astronomy

Background:

  • The Galactic Center exhibits intense 0.511 MeV gamma-ray line emission, indicating a high rate of positron-electron annihilation.
  • Positron annihilation at relativistic energies would produce higher-energy gamma rays, which are not predominantly observed.

Purpose of the Study:

  • To calculate the gamma-ray spectrum resulting from positron inflight annihilation.
  • To compare the calculated spectrum with observed diffuse Galactic gamma-ray data.
  • To constrain models of Galactic positron production based on observed gamma-ray emissions.

Main Methods:

  • Calculation of the gamma-ray spectrum from inflight positron annihilation.
  • Comparison of theoretical spectra with observational data from gamma-ray telescopes like INTEGRAL.

Related Experiment Videos

  • Analysis of positron injection energy requirements.

    • Main Results:

    • The observed diffuse Galactic gamma-ray data are consistent with positron injection energies less than or equal to approximately 3 MeV.
    • Higher positron injection energies would result in a detectable excess of higher-energy gamma rays, which is not observed.

    Conclusions:

    • Positron production models for the Galactic Center must account for low injection energies (<3 MeV).
    • The findings strongly constrain astrophysical models attempting to explain the origin and behavior of positrons in the Milky Way.