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Pierre Auger Observatory

Cosmic Rays (ionized atomic nuclei) are the only matter from beyond our solar system or even from extragalactic space, that we can directly investigate. Up to energies of 10^17 eV they most likely originate in our Galaxy. The highest-energy cosmic rays (> 10^18eV) cannot be magnetically bound any more to the Galaxy and are most likely of extragalactic origin.

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The pure existence of these particles raises the question about their origin – how and where are they accelerated? How do they propagate through the universe and interact? How can we directly probe extragalactic matter, locate its origin, and understand its physics processes?
An important key to understand the origin of cosmic rays is to measure the particle species (atomic mass). A precise mass measurement will allow discriminating astrophysical models and will clarify the reason for the observed suppression of the cosmic-ray flux at the highest energies, namely the maximum energy of the accelerators and/or energy losses during propagation, and/or even unthought causes.

The world-leading facility to address these questions is the Pierre Auger Observatory in Argentina. When high-energy cosmic rays impinge onto the atmosphere they interact with atomic nuclei and initiate an avalanche of secondary particles, the extensive air showers. At the Auger Observatory different detection techniques are utilized to record extensive air showers: a 3000 km2 surface detector array to record particles on the ground, fluorescence telescopes to record the optical and near-UV light emitted by the shower, and radio antennas to record radio emission in the frequency range from 30 to 80 MHz.

The core activity of our group is the  Auger Engineering Radio Array (AERA), a 17 km2 radio detector at the Auger Observatory.
We are currently also involved in an upgrade of the Observatory to achieve good measurements of the particle type up to the highest energies. This includes, in particular, plans to equip every surface detector station with a radio detector in order to form a 3000 km2 radio array for the precision measurements of ultra-higjh-energy cosmic rays.
For more information on the Pierre Auger Observatory, please click here: https://www.auger.org