Possible structure in the cosmic ray electron spectrum measured by the ATIC-2 and ATIC-4 experiments

TL;DR

This paper presents an independent analysis of cosmic ray electron data from ATIC experiments, confirming a spectral excess and revealing narrow peaks in the 300-800 GeV range, with comparisons to Fermi/LAT results.

Contribution

It provides a new independent analysis of ATIC data, identifying narrow peaks in the electron spectrum and comparing results with previous studies.

Findings

Confirmed excess in electron spectrum between 300-800 GeV

Revealed narrow peaks within the excess region

Compared spectrum with Fermi/LAT results

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 (J. Chang et al. Nature, 2008). The experimental data processing and analysis of the electron spectrum with different criteria for selection of electrons, completely independent of the results reported in (J. Chang et al. Nature, 2008) is employed in the present paper. The new independent analysis generally confirms the results of (J. Chang et al. Nature, 2008), 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 (J. Chang et al. Nature, 2008) and to the spectrum of the Fermi/LAT experiment.