Ultra-high energy cosmic rays: Present and future

Figures & data

Figure 1. Top: The energy spectrum as measured by Auger (the numbers show the number of events in each energy bin); Bottom: The Auger energy spectrum is compared with the measurements of other experiments, in particular TA (see Schulz, for the Pierre Auger Collaboration, 2013 for details).

Figure 2. Number of event directions correlating with AGN as a function of the total number of events ordered by energy. The 1, 2 and 3$\mathit{\sigma }$ bands are also shown (Selvon for the Pierre Auger Collaboration, 2014).

Figure 3. Current limits on the flux of primary photons are shown, together with the prediction for cosmogenic (GZK) and different types of exotic models (Abraham et al., The Pierre Auger Collaboration, 2009).

Figure 4. Depth of shower maximum: average value (left) and RMS (right). Auger results are shown together with model expectations (Aab et al., The Pierre Auger Collaboration, 2014 ; de Souza, for the Pierre Auger Collaboration, 2013).

Figure 5. Muonic ($R_{\mathit{\mu }}$) and electromagnetic ($R_E$) shower sizes normalized to the prediction of different models for 10${}^{19}$ eV showers (Farrar, for the Pierre Auger Collaboration, 2013).

Schulz, A., for the Pierre Auger Collaboration. (2013). The measurement of the energy spectrum of cosmic rays above 3 x 1017 eV with the Pierre Auger Observatory. In Proceedings of the 33rd International Cosmic Ray Conference (p. 27). Rio de Janeiro, arXiv: 1307.5059.

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Selvon, A. L. , for the Pierre Auger Collaboration. (2014). Highlights from the Pierre Auger Observatory. Brazilian Journal of Physics, 44, 560–570, arXiv:1310.4620.

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Abraham, J., et al., The Pierre Auger Collaboration. (2009). Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory. Astroparticle Physics, 31, 399–406.

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Aab, A., et al., The Pierre Auger Collaboration. (2014). Depth of maximum of air-shower profiles at the Pierre Auger Observatory. I. Measurements at energies above 1017.8 eV. Physical Review D, 90, 122005.

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de Souza, V., for the Pierre Auger Collaboration. (2013). An update on the measurements of the depth of shower maximum made at the Pierre Auger Observatory. In Proceedings of the 33rd International Cosmic Ray Conference (p. 35). Rio de Janeiro, arXiv: 1307.5059.

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Farrar, G., for the Pierre Auger Collaboration. (2013). The muon content of hybrid events recorded at the Pierre Auger Observatory. In Proceedings of the 33rd International Cosmic Ray Conference (p. 52). Rio de Janeiro, arXiv: 1307.5059.

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