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 $5 cdot 10^{18}$
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.
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