The analysis of the Auger data has shown that the highest energy cosmic rays are charged particles, that come from outside our galaxy, and that there is a sharp fall of the flux at E ~ 40 EeV. On the other hand, it has shown that the shower models extrapolating the existing data from particle accelerators do not match what is seen in these highest energy cosmic ray data.
Updated results to the International Cosmic Ray Conference
Selected Results on
Multi-Messenger Physics with the Pierre Auger Observatory
The Pierre Auger Collaboration, Front. Astron. Space Sci. 6:24 (2019)
[arxiv.org/abs/1904.11918] [doi: 10.3389/fspas.2019.00024 ]
Search for High-Energy Neutrinos from Binary Neutron Star Merger GW170817 with ANTARES, IceCube, and the Pierre Auger Observatory
ANTARES Collaboration, IceCube Collaboration, The Pierre Auger Collaboration, and LIGO Scientific Collaboration and Virgo Collaboration, The Astrophysical Journal Letters, 850:L35, 2017 | [arXiv: 1710.05839] [iopscience/10.3847/2041-8213/aa9aed]
Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above 8×1018 eV
The Pierre Auger Collaboration, Science 357 (2017) | [doi: 10.1126/science.aan4338] [arXiv: 1709.07321]
Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array
The Pierre Auger Collaboration, Telescope Array Collaboration, IceCube Collaboration JCAP 01 (2016) 037
[doi: 10.1088/1475-7516/2016/01/037] [arXiv: 1511.09408]
Large scale distribution of ultra high energy cosmic rays detected at the Pierre Auger Observatory with zenith angles up to 80 degrees
The Pierre Auger Collaboration, ApJ 802, 111 (2015) | [doi: 10.1088/0004-637X/802/2/111] [arXiv: 1411.6953]
Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory
The Pierre Auger Collaboration, JCAP 04 (2017) 009 | [doi: 10.1088/1475-7516/2017/04/009] [arXiv: 1612.01517]
Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory
The Pierre Auger Collaboration, JCAP 04 (2017) 038 | [doi: 10.1088/1475-7516/2017/04/038] [arXiv: 1612.07155]
Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum
The Pierre Auger Collaboration, Phys.Lett. B762 (2016) 288-295 | [doi: 10.1016/j.physletb.2016.09.039] [arxiv: 1609.08567]
Measurement of the cosmic ray spectrum above 4×10^18 eV using inclined events detected with the Pierre Auger Observatory
The Pierre Auger Collaboration, JCAP 08 (2015) 049 | [doi: 10.1088/1475-7516/2015/08/049] [arXiv: 1503.07786]
An improved limit to the diffuse flux of ultra-high energy neutrinos from the Pierre Auger Observatory
The Pierre Auger Collaboration, Phys. Rev. D 91, 092008 (2015) | [doi: 10.1103/PhysRevD.91.092008] [arXiv: 1504.05397]
A Targeted Search for Point Sources of EeV Neutrons
The Pierre Auger Collaboration, ApJ, 789 (2014) L34 | [doi:10.1088/2041-8205/789/2/L34] [arXiv:1406.4038]
Measurement of the fluctuations in the number of muons in extensive air showers with the Pierre Auger Observatory The Pierre Auger Collaboration, PRL 152002 (2021) | [doi: 10.1103/PhysRevLett.126.152002][arXiv:2102.07797]
Testing hadronic interactions at ultrahigh energies with air showers measured by the Pierre Auger Observatory
The Pierre Auger Collaboration, PRL 117, 192001 (2016) | [doi: 10.1103/PhysRevLett.117.192001] [arXiv: 1610.08509]; Editors suggestion
Search for Ultra-relativistic Magnetic Monopoles with the Pierre Auger Observatory
The Pierre Auger Collaboration, Phys. Rev. D 94, 082002 (2016) | [doi: 10.1103/PhysRevD.94.082002] [arXiv: 1609.04451]
Muons in air showers at the Pierre Auger Observatory: mean number in highly inclined events
The Pierre Auger Collaboration, Physical Review D 91, 032003 (2015); ERRATA: Phys. Rev. D 91, 059901 (2015)
[doi: 10.1103/PhysRevD.91.032003] [arXiv: 1408.1421]
Depth of Maximum of Air-Shower Profiles at the Auger Observatory: Measurements at Energies above 1017.8 eV
The Pierre Auger Collaboration, Physical Review D 90, 122005 (2014) | [doi: 10.1103/PhysRevD.90.122005] [arXiv: 1409.4809]
Muons in air showers at the Pierre Auger Observatory: Measurement of atmospheric production depth
The Pierre Auger Collaboration, Physical Review D 90, 012012 (2014); ERRATA: Phys. Rev. D 90, 039904(E) (2014); ERRATA: Phys. Rev. D 92, 019903 (2015)
[doi:10.1103/PhysRevD.90.012012] [arXiv:1407.5919]
Interpretation of the Depths of Maximum of Extensive Air Showers Measured by the Pierre Auger Observatory
The Pierre Auger Collaboration, JCAP 02 (2013) 026 | [doi:10.1088/1475-7516/2013/02/026] [arXiv:1301.6637]
Measurement of the proton-air cross-section at sqrt(s) = 57 TeV with the Pierre Auger Observatory
The Pierre Auger Collaboration, Phys. Rev. Lett. 109, 062002 (2012) | [doi:!0.1103/PhysRevLett.109.062002] [arXiv:1208.1520]
The Pierre Auger Observatory and its Upgrade
The Pierre Auger Collaboration, Science Reviews – from the end of the world (Argentina) Vol. 1, No. 4, September 2020 // pp. 8-33
[Science Reviews]
Features of the energy spectrum of cosmic rays above 2.5 x 10^18 eV using the Pierre Auger Observatory
The Pierre Auger Collaboration, Phys. Rev. Lett. 125, 121106 (2020)
[arxiv.org/abs/2008.06488] [doi: 10.1103/PhysRevLett.125.121106]
Measurement of the cosmic ray energy spectrum above 2.5 x 10^18 eV using the Pierre Auger Observatory
The Pierre Auger Collaboration, Phys. Rev. D 102, 062005 (2020)
[arxiv.org/abs/2008.06486] [doi: 10.1103/PhysRevD.102.062005]
Studies on the response of a water-Cherenkov detector of the Pierre Auger Observatory to atmospheric muons using an RPC hodoscope
The Pierre Auger Collaboration, JINST 15 (2020) P09002
[arxiv.org/abs/2007.04139] [doi: 10.1088/1748-0221/15/09/P09002]
Measurement of the average shape of longitudinal profiles of cosmic ray air-showers at the Pierre Auger Observatory
The Pierre Auger Collaboration, JCAP03(2019)018
[arxiv.org/abs/1811.04660] [doi: 10.1088/1475-7516/2019/03/018]
Energy Estimation of Cosmic Rays with the Engineering Radio Array of the Pierre Auger Observatory
The Pierre Auger Collaboration, Phys. Rev. D 93, 122005 (2016) | [arXiv: 1508.04267] [doi: 10.1103/PhysRevD.93.122005]
Measurement of the radiation energy in the radio signal of extensive air showers as a universal estimator of cosmic-ray energy
The Pierre Auger Collaboration, PRL 116, 241101 (2016) | [arXiv: 1605.02564] [doi: 10.1103/PhysRevLett.116.241101]
Constraining the energy spectrum of neutral pions in ultra-high-energy Marta: a high energy cosmic-ray detector concept for high-accuracy muon measurement Probing the energy spectrum of hadrons in proton air interactions at ultra high energies through the fluctuations of the muon content of extensive air showers
proton-air interactions L. Cazon, R. Conceição, M. A. Martins and F. Riehn, Phys. Rev. D (2021) 103, 022001 | [arxiv:2006.11303][doi:10.1103/PhysRevD.103.022001]
P. Abreu et al, Eur. Phys. J. C (2018) 78:333 | [arXiv: 1712.07685] | [doi:10.1140/epjc/s10052-018-5820-2]
L. Cazon, R. Conceição and F. Riehn, Phys. Let. B 784, 68-76(2018) | [arXiv: 1803.05699] | [doi:10.1016/j.physletb.2018.07.026]