Statistics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..aprp13003b&link_type=abstract
American Physical Society, APS April Meeting 2010, February 13-16, 2010, abstract #P13.003
Statistics
Scientific paper
The energy spectrum of cosmic rays above 10^18 eV has been measured with unprecedented statistics at the Pierre Auger Observatory. From air shower measurements made using the fluorescence telescopes and the surface detector array at the Auger site, we report three measurements of the energy spectrum: using downgoing events observed with the surface array only; using nearly horizontal showers observed with the surface array; and using showers observed with the fluorescence telescopes and surface array in combination. These three techniques use partly independent data sets with different systematic uncertainties, providing useful checks of the spectrum measurement. The observed spectra agree within systematic uncertainties, and indicate a hardening of the spectral index near 10^18.6 eV and a significant suppression of the flux above 10^19.5 eV. We will describe the systematic uncertainties of the reported fluxes, and discuss the astrophysical implications of these measurements. )
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