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Where do ultra-high-energy cosmic rays come from?

This is still an open question in astroparticle physics and a long-standing mystery that the Pierre Auger Observatory aims to solve.

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Demonstrating Agreement between Radio and Fluorescence Measurements of the Depth of Maximum of Extensive Air Showers

Understanding the origin and nature of ultra-high energy cosmic rays has been one of the driving forces of the field of astroparticle physics. A key piece of information is what type of particles cosmic rays consist of.

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New Spokespersons for the Pierre Auger Observatory

We are very happy to announce the election of our new spokespersons Antonella Castellina and Markus Roth at the recent collaboration meeting of the Pierre Auger Observatory.

Best Talk: Eric Mayotte
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Auger Impact Award 2023

The Auger Impact Awards 2023 go to Collaborators Eva dos Santos and Jorge Ruben Rodriguez.

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Do black-hole mergers emit ultra-high energy photons?

For the first time, the possible appearance of ultra-high energy photons from merging compact objects such as black holes was tested.

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What is the origin of ultra-high-energy cosmic rays?

The energy spectrum and mass composition data from the Pierre Auger Observatory constrain the source properties.

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