Possible structure in the cosmic ray electron spectrum measured by the ATIC-2 and ATIC-4 experiments
18 Apr 2011
1Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia
2Marshall Space Flight Center, Huntsville, AL, USA
3University of Maryland, Institute for Physical Science and Technology, College Park, MD, USA
4Purple Mountain Observatory, Chinese Academy of Sciences, China
5Louisiana State University, Department of Physics and Astronomy, Baton Rouge, LA, USA
Abstract. A strong excess in a form of a wide peak in the energy range of 300–800 GeV was discovered in the first measurements of the electron spectrum in the energy range from 20 GeV to 3 TeV by the balloon-borne experiment ATIC (Chang et al., 2008b). The experimental data processing and analysis of the electron spectrum with different criteria for selection of electrons, completely independent of the results reported in Chang et al. (2008b) is employed in the present paper. The new independent analysis generally confirms the results of Chang et al. (2008b), but shows that the spectrum in the region of the excess is represented by a number of narrow peaks. The measured spectrum is compared to the spectrum of Chang et al. (2008b) and to the spectrum of the Fermi/LAT experiment.