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

Authors

Armando Di Matteo, Istituto Nazionale di Fisica Nucleare - INFN
A. Aab, Universität Siegen
P. Abreu, Instituto Superior Técnico
M. Aglietta, Istituto Nazionale di Fisica Nucleare, Sezione di Torino
E. J. Ahn, Fermi National Accelerator Laboratory
I. Al Samarai, Laboratoire de Physique Nucléaire et de Hautes Energies
I. F.M. Albuquerque, Universidade de Sao Paulo - USP
I. Allekotte, Instituto Balseiro
P. Allison, The Ohio State University
A. Almela, Consejo Nacional de Investigaciones Científicas y Técnicas
J. Alvarez Castillo, Universidad Nacional Autónoma de México
J. Alvarez-Muñiz, Universidad de Santiago de Compostela
M. Ambrosio, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
G. A. Anastasi, Gran Sasso Science Institute
L. Anchordoqui, Lehman College
B. Andrada, Consejo Nacional de Investigaciones Científicas y Técnicas
S. Andringa, Instituto Superior Técnico
C. Aramo, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
F. Arqueros, Universidad Complutense de Madrid
N. Arsene, Universitatea din Bucuresti
H. Asorey, Instituto Balseiro
P. Assis, Instituto Superior Técnico
J. Aublin, Laboratoire de Physique Nucléaire et de Hautes Energies
G. Avila, Pierre Auger Observatory
A. M. Badescu, University Politehnica of Bucharest
A. Balaceanu, Horia Hulubei National Institute of Physics and Nuclear Engineering
C. Baus, Karlsruhe Institute of Technology, Campus North
J. J. Beatty, The Ohio State University
K. H. Becker, Bergische Universitat Wuppertal
J. A. Bellido, The University of Adelaide
C. Berat, IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
M. E. Bertaina, Istituto Nazionale di Fisica Nucleare, Sezione di Torino

Document Type

Conference Proceeding

Publication Date

3-23-2017

Abstract

© The Authors, published by EDP Sciences, 2017. 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.

Publication Title

EPJ Web of Conferences

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