Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-06
Nucl.Instrum.Meth.A566:302-311,2006
Astronomy and Astrophysics
Astrophysics
21 pages, 5 figures, accepted for publication in Nucl. Instr. & Meth. in Phys. Res. A
Scientific paper
10.1016/j.nima.2006.07.023
The Pierre Auger Observatory has been designed to study the highest-energy cosmic rays in nature (E > 10^{18.5} eV). The determination of their arrival direction, energy and composition is performed by the analysis of the atmospheric showers they produce. The Auger Surface Array will consist of 1600 water Cerenkov detectors placed in an equilateral triangular grid of 1.5 km spacing. The aim of this paper is to show that the addition of a "small" area of surface detectors at half or less the above mentioned spacing would allow a dramatic increase of the physical scope of this Observatory, reaching lower energies at which the transition from galactic to extragalactic sources is expected.
Allekotte I.
Berisso Gómez M.
Etchegoyen Alberto
Medina María C.
Medina-Tanco Gustavo
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