Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory

Aab, Alexander; Abreu, Pedro; Aglietta, Marco; Al Samarai, Imen; Albuquerque, Ivone; Allekotte, Ingomar; Almela, Alejandro; Alvarez Castillo, Jesus; Alvarez-Muñiz, Jaime; Anastasi, Gioacchino Alex

doi:10.1088/1475-7516/2017/04/038

Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory

Pierre Auger

Collaboration

Dec 21, 2016

40 pages

Published in:

JCAP 04 (2017) 038,
JCAP 03 (2018) E02 (erratum)

Published: Apr 20, 2017

e-Print:

1612.07155 [astro-ph.HE]

DOI:

10.1088/1475-7516/2017/04/038,
10.1088/1475-7516/2018/03/E02 (erratum)

Report number:

FERMILAB-PUB-16-618

Experiments:

AUGER

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Abstract: (IOP)

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 ⋅ 10(18) eV, 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 through a rigidity-dependent mechanism. The fit results suggest sources characterized by relatively low maximum injection energies, hard spectra and heavy chemical composition. We also show that uncertainties about physical quantities relevant to UHECR propagation and shower development have a non-negligible impact on the fit results.

Note:

Corrected typos in values of SD vertical spectrum energy bias (B.5); Added expression for SD inclined spectrum energy resolution (B.6), erroneously claimed to have been published before

ultra high energy cosmic rays
cosmic ray experiments
cosmic ray theory
intergalactic media
energy: injection
observatory
Auger
cosmic radiation: energy spectrum
cosmic radiation: UHE
mass spectrum

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