Pierre Auger Observatorium

Infrastructure and User Services 

The Auger Observatory is a "hybrid detector", employing several independent methods to detect and study ultra-high-energy cosmic rays. One technique detects high-energy particles at ground level through their interaction with water in surface detector tanks. In a recent upgrade (completed 2024) also scintillation detectors have been added on top of each water-Cherenkov detector. Another technique tracks the development of the air shower by observing ultra-violate fluorescence light emitted by the shower in the atmosphere. A third method detects radio-frequency radiation emitted by air showers using antennas. Finally, a fourth method of underground particle detectors, detects the muons in the shower at ground level. The hybrid nature of Auger provides for several independent ways to see cosmic rays, which has proved essential in calibrating the individual methods. They also provide complementary information on different aspects of the air shower. The surface and fluorescence detectors have been active for 25 years, while the radio detector has been completed in 2024 and started operation in 2025, and the underground muon detectors are presently (2025) being installed and commissioned.

Examples/description of the type of research 

One of the primary goals of the research is to identify the sources of ultra-high-energy cosmic rays, which are particles with energies far beyond those achievable in terrestrial particle accelerators. The Pierre Auger Observatory investigates the type of particle/atomic mass of these cosmic rays with unprecedented precision, their potential origin, and the mechanisms behind their acceleration. By studying these particles, scientists aim to understand the most energetic astrophysical processes, such as those occurring near black holes or potentially also gravitational wave events.

The research conducted at the Pierre Auger Observatory is pivotal for advancing our knowledge of fundamental physics, cosmology, and astrophysics, pushing the boundaries of our understanding of the universe’s most energetic phenomena.

How to access the infrastructure 

People work at the observatory - physical access. Data are available from a central storage facility - remote access. The Pierre Auger Collaboration includes over 500 scientists from Argentina, Australia, Belgium, Brazil, Colombia, the Czech Republic, France, Germany, Italy, Mexico, the Netherlands, Poland, Portugal, Romania, Slovenia, Spain, and the United States of America. A complete list of institutes can be found here: https://www.auger.org/collaboration/institutions