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Published September 15, 2007 | Published
Journal Article Open

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


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.

Additional Information

© 2007 The American Physical Society. (Received 12 October 2006; published 17 September 2007) We thank S. Profumo for useful discussions and comments and J. Beacom for useful comments on an earlier draft. A.R.P. was supported by the NSF. R.C. was partially funded under NASA Contract No. 1407. M.K. was supported by DOE DE-FG03-92-ER40701, NASA NNG05GF69G, and the Gordon and Betty Moore Foundation.

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