Measurement of the UHECR energy spectrum from hybrid data of the Pierre Auger Observatory

PIERRE AUGER COLLABORATION (J. ABRAHAM, ... , A. MARIAZZI, ET AL)

Merida, Mejico

Conferencia; 30th International Cosmic Ray Conference; 2007

Three years of data collected with the fluorescence detector in coincidence with atleast one station of the surface detector array ('hybrid data') are used to measurethe flux and energy spectrum of cosmic rays above about 10^{18}eV. The hybridmeasurement extends the spectrum measured with the surface detector data alonetowards lower energies, and provides a cross-check in the overlap region with anindependent analysis method. The determination of the aperture of the fluorescencedetector and of the live-time, which are key features of this measurement, isillustrated in detail. Our estimates of the corresponding systematic uncertaintiesare given.