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

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

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”’ fe...

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Main Author: di Matteo Armando
Format: Article
Language:English
Published: EDP Sciences 2017-01-01
Series:EPJ Web of Conferences
Online Access:https://doi.org/10.1051/epjconf/201713602002
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spelling doaj-69c86b83499d44609d5a2e544196108e2021-08-02T04:06:27ZengEDP SciencesEPJ Web of Conferences2100-014X2017-01-011360200210.1051/epjconf/201713602002epjconf_ricap2017_02002Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass compositiondi Matteo Armando0INFN and Department of Physical and Chemical Sciences, University of L’AquilaWe 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.https://doi.org/10.1051/epjconf/201713602002
collection DOAJ
language English
format Article
sources DOAJ
author di Matteo Armando
spellingShingle di Matteo Armando
Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition
EPJ Web of Conferences
author_facet di Matteo Armando
author_sort di Matteo Armando
title Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition
title_short Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition
title_full Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition
title_fullStr Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition
title_full_unstemmed Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition
title_sort astrophysical interpretation of pierre auger observatory measurements of the uhecr energy spectrum and mass composition
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2017-01-01
description 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.
url https://doi.org/10.1051/epjconf/201713602002
work_keys_str_mv AT dimatteoarmando astrophysicalinterpretationofpierreaugerobservatorymeasurementsoftheuhecrenergyspectrumandmasscomposition
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