Measurement of the energy spectrum of cosmic rays at the highest energies using data from Pierre Auger Observatory

Ioana C. Maris, for the Pierre Auger Collaboration

Published 2013-07-01Version 1

We report a measurement of the flux of cosmic rays with unprecedented precision and statistics using data from the Pierre Auger Observatory. Based on fluorescence observations in coincidence with at least one station of the surface detector we derive a spectrum for energies above 1 EeV. We also report on the energy spectra obtained with the surface detector array. The spectral features are presented in detail and the impact of systematic uncertainties on these features are addressed.