On discrepancy between ATIC and Fermi data

Abstract

Either ATIC or Fermi-LAT data can be fitted together with the PAMELA data by three components: primary background ~ E^{-3.3}, secondary background ~ E^{-3.6}, and an additional source of electrons ~ E^{-g_a} Exp(-E/E_{cut}). We find that the best fits for ATIC + PAMELA and for Fermi + PAMELA are approximately the same, g_a ~ 2 and E_{cut} ~ 500 GeV. However, the ATIC data have a narrow bump between 300 GeV and 600 GeV which contradicts the smooth Fermi spectrum. An interpretation of the ATIC bump as well as the featureless Fermi spectrum in terms of dark matter models and pulsars is discussed.

9 pages, 2 figures, 1 table; v2: minor corrections

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Cited by in corpus (9)

• Pulsars versus Dark Matter Interpretation of ATIC/PAMELA
• Nonabelian dark matter: models and constraints
• W/Z Bremsstrahlung as the Dominant Annihilation Channel for Dark Matter
• Dark Matter Annihilation Signatures from Electroweak Bremsstrahlung
• Radio and gamma-ray constraints on dark matter annihilation in the Galactic center
• Absolute electron and positron fluxes from PAMELA/Fermi and Dark Matter
• Positrons in Cosmic Rays from Dark Matter Annihilations for Uplifted Higgs Regions in MSSM
• Superbradyons and some possible dark matter signatures
• Extracting the size of the cosmic electron-positron anomaly