On discrepancy between ATIC and Fermi data
High Energy Astrophysical Phenomena
2009-07-30 v2 High Energy Physics - Phenomenology
High Energy Physics - Theory
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.
Cite
@article{arxiv.0905.2611,
title = {On discrepancy between ATIC and Fermi data},
author = {Dmitry Malyshev},
journal= {arXiv preprint arXiv:0905.2611},
year = {2009}
}
Comments
9 pages, 2 figures, 1 table; v2: minor corrections