Measurement of the energy spectrum of ultra-high energy cosmic rays using the Pierre Auger Observatory

THE PIERRE AUGER COLLABORATION (AUTOR 369 DE 395); M. TUEROS (COAUTOR)

Madison

Conferencia; 36th International Cosmic Ray Conference; 2019

International Union of Pure and Applied Physics

The energy spectrumof ultra-high energy cosmic rays measured using the Pierre AugerObservatory is presented. The measurements benefit from the huge exposure of approximately80000km2 sr yr achievedin 14 years of data taking with a surface-detector array that extendsover 3000km2 having 1600detectors on a 1500 m spacing, and from the almost-calorimetricestimation of the energy scaleprovided by the fluorescence detector. In this contribution, weaddress recent improvements inthe measured spectrum at energies above 3 EeV using events withzenith angles less than 60degrees. These improvements concern the estimation of the showerenergy and its resolution. Further, we report on updates of theenergy spectra derived from other independent and complementarydata sets, namely from showers with larger zenith angles, thosedetected by a smaller and denserarray with 750 m spacing, and those detected by the fluorescencedetector, together with therecent extension of the flux measurements to lower energies usingatmospheric Cherenkov radiation.p { margin-bottom: 0.25cm; line-height: 120%; }