Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition

Pierre Auger Collaboration

Research output: Contribution to journalConference articlepeer-review

Abstract

We present a combined fit of a simple astrophysical model of UHECR sources to both the energy spectrum and mass composition data measured by the Pierre Auger Observatory. The fit has been performed for energies above 5 EeV, i.e. the region of the all-particle spectrum above the so-called "ankle"' feature. The astrophysical model we adopted consists of identical sources uniformly distributed in a comoving volume, where nuclei are accelerated with a rigidity-dependent mechanism. The fit results suggest sources characterized by relatively low maximum injection energies and hard spectral indices. The impact of various systematic uncertainties on the above result is discussed.

Original languageEnglish (US)
Article number02002
JournalEPJ Web of Conferences
Volume136
DOIs
StatePublished - Mar 23 2017
Event6th Roma International Conference on Astroparticle Physics, RICAP 2016 - Frascati, Roma, Italy
Duration: Jun 21 2016Jun 24 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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