Search with EGRET for a gamma ray line from the Galactic center

Anthony R. Pullen, Ranga Ram Chary, Marc Kamionkowski

    Research output: Contribution to journalArticlepeer-review


    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°×10° 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.

    Original languageEnglish (US)
    Article number063006
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Issue number6
    StatePublished - Sep 17 2007

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)


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