26 research outputs found

    Fermi LAT Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications

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    Dark matter (DM) particle annihilation or decay can produce monochromatic γ\gamma-rays readily distinguishable from astrophysical sources. γ\gamma-ray line limits from 30 GeV to 200 GeV obtained from 11 months of Fermi Large Area Space Telescope data from 20-300 GeV are presented using a selection based on requirements for a γ\gamma-ray line analysis, and integrated over most of the sky. We obtain γ\gamma-ray line flux upper limits in the range 0.64.5×109cm2s10.6-4.5\times 10^{-9}\mathrm{cm}^{-2}\mathrm{s}^{-1}, and give corresponding DM annihilation cross-section and decay lifetime limits. Theoretical implications are briefly discussed.Comment: 6 pages, 1 figure. Accepted for publication by The Physical Review Letter
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