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Open AccessArticle

The Pierre Auger Observatory: Review of Latest Results and Perspectives

1
Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, 31-342 Cracow, Poland
2
Observatorio Pierre Auger, Av. San Martín Norte 304, Malargue 5613, Argentina
*
Author to whom correspondence should be addressed.
Full author list: http://www.auger.org/archive/authors_2018_07.html.
Universe 2018, 4(11), 128; https://doi.org/10.3390/universe4110128
Received: 27 October 2018 / Revised: 13 November 2018 / Accepted: 14 November 2018 / Published: 17 November 2018
The Pierre Auger Observatory is the world’s largest operating detection system for the observation of ultra high energy cosmic rays (UHECRs), with energies above 10 17 eV. The detector allows detailed measurements of the energy spectrum, mass composition and arrival directions of primary cosmic rays in the energy range above 10 17 eV. The data collected at the Auger Observatory over the last decade show the suppression of the cosmic ray flux at energies above 4 × 10 19 eV. However, it is still unclear if this suppression is caused by the energy limitation of their sources or by the Greisen–Zatsepin–Kuzmin (GZK) cut-off. In such a case, UHECRs would interact with the microwave background (CMB), so that particles traveling long intergalactic distances could not have energies greater than 5 × 10 19 eV. The other puzzle is the origin of UHECRs. Some clues can be drawn from studying the distribution of their arrival directions. The recently observed dipole anisotropy has an orientation that indicates an extragalactic origin of UHECRs. The Auger surface detector array is also sensitive to showers due to ultra high energy neutrinos of all flavors and photons, and recent neutrino and photon limits provided by the Auger Observatory can constrain models of the cosmogenic neutrino production and exotic scenarios of the UHECRs origin, such as the decays of super heavy, non-standard-model particles. In this paper, the recent results on measurements of the energy spectrum, mass composition and arrival directions of cosmic rays, as well as future prospects are presented. View Full-Text
Keywords: Pierre Auger Observatory; ultra high energy cosmic rays; extensive air showers Pierre Auger Observatory; ultra high energy cosmic rays; extensive air showers
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Góra, D.; For the Pierre Auger Collaboration. The Pierre Auger Observatory: Review of Latest Results and Perspectives. Universe 2018, 4, 128.

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