On discrepancy between ATIC and Fermi data

Details On discrepancy between ATIC and Fermi data On discrepancy between ATIC and Fermi data

2009-05-18

arxiv.org/abs/0905.2611v2

JCAP 0907:038,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

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

Scientific paper

10.1088/1475-7516/2009/07/038

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.

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