Search with EGRET for a Gamma Ray Line from the Galactic Center

Abstract

We search data from the Energetic Gamma Ray Experiment Telescope (EGRET) for a gamma-ray line in the energy range 0.1-10 GeV from the 10 X 10 degree region around the Galactic center. Our null results lead to upper limits to the line flux from the Galactic center. Such lines may have appeared if the dark matter in the Galactic halo is composed of weakly-interacting massive particles (WIMPs) in the mass range 0.1-10 GeV. For a given dark-matter-halo model, our null search translates to upper limits to the WIMP two-photon annihilation cross section as a function of WIMP mass. We show that for a toy model in which Majorana WIMPs in this mass range annihilate only to electron-positron pairs, these upper limits supersede those derived from measurements of the 511-keV line and continuum photons from internal bremsstrahlung at the Galactic center.

Accepted for publication in PRD; 8 pages; 9 figures; 3 tables; text changed to clarify several points; conclusions unchanged

References in corpus (3)

• Continuum gamma-ray emission from light dark matter positrons and electrons
• Indirect detection of light neutralino dark matter in the NMSSM
• Light Dark Matter Annihilations into Two Photons

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