https://doi.org/10.1051/epjconf/202328004002
Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition
1
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, CNRS/IN2P3, Université Paris-Saclay, France
2
Observatorio Pierre Auger,
Av. San Martín Norte 304,
5613
Malargüe, Argentina
* e-mail: condorelli@ijclab.in2p3.fr
** e-mail: spokespersons@auger.org A complete list of authors can be found at: https://www.auger.org/archive/authors_2022_09.html
Published online: 20 March 2023
We present a combined fit of a simple astrophysical model of Ultra-high-energy cosmic-ray sources to both the energy spectrum and mass composition data measured by the Pierre Auger Observatory. 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 has been performed at first for energies above 5 EeV, i.e., the region of the all-particle spectrum above the so-called “ankle” feature, and has then been extended to lower energies in order to include this feature. The fit results and their astrophysical implications in both cases are discussed.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
