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The energy spectrum of ultra-high energy cosmic rays measured at the Pierre Auger Observatory and at the Telescope Array

Authors :
Serguei Vorobiov
Gašper Kukec Mezek
Danilo Zavrtanik
A. Filipcic
Lili Yang
Lukas Zehrer
Marko Zavrtanik
Olivier Deligny
Jon Paul Lundquist
Samo Stanič
M. Trini
Institut de Physique Nucléaire d'Orsay (IPNO)
Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Pierre Auger
Telescope Array
Source :
PoS, 36th International Cosmic Ray Conference, 36th International Cosmic Ray Conference, Jul 2019, Madison, United States. pp.234, ⟨10.22323/1.358.0234⟩
Publication Year :
2019
Publisher :
HAL CCSD, 2019.

Abstract

The energy spectrum of ultra-high energy cosmic rays (UHECRs) provides essential information on the most energetic phenomena in the Universe. Beyond EeV energies, the Telescope Array and Pierre Auger Observatory have the largest exposures to UHECRs ever accumulated in the Northern and Southern hemispheres, respectively. The results show independently a steepening of the energy spectrum above a few tens of EeV. However, the comparison of the spectra shows differences that are not explainable in terms of an overall uncertainty on the energy scale used to reconstruct the extensive air showers. The differences are also observed in the region of the sky covered by both instruments, where the spectra should be in agreement within uncertainties when directional-exposure effects are accounted for. For this contribution, a working group from both collaborations examined these differences considering the energy-dependent systematic uncertainties. A special focus is given to the characterization of the spectral features, which provide an accurate tool to enhance our understanding of the comparisons.<br />Comment: Proceedings of 36th International Cosmic Ray Conference

Details

Language :
English
Database :
OpenAIRE
Journal :
PoS, 36th International Cosmic Ray Conference, 36th International Cosmic Ray Conference, Jul 2019, Madison, United States. pp.234, ⟨10.22323/1.358.0234⟩
Accession number :
edsair.doi.dedup.....bb4d09048dd1b05d366e15e6ee8f9e48