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

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

2006-10-10

arxiv.org/abs/astro-ph/0610295v2

Phys.Rev.D76:063006,2007

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1103/PhysRevD.76.063006

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.

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