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Astrophysical Sources of Cosmic Rays and Related Measurements with the Pierre Auger Observatory
The Pierre Auger Collaboration, J. Abraham, P. Abreu +469
Studies of the correlations of ultra-high energy cosmic ray directions with extra-Galactic objects, of general anisotropy, of photons and neutrinos, and of other astrophysical effe…
The Cosmic Ray Energy Spectrum and Related Measurements with the Pierre Auger Observatory
The Pierre Auger Collaboration, J. Abraham, P. Abreu +469
Studies of the cosmic ray energy spectrum at the highest energies with the Pierre Auger Observatory.
Fluorescence emission induced by extensive air showers in dependence on atmospheric conditions
Bianca Keilhauer, Michael Unger
Charged particles of extensive air showers (EAS), mainly electrons and positrons, initiate the emission of fluorescence light in the Earth's atmosphere. This light provides a calor…
Proton-Air Cross Section and Extensive Air Showers
Ralf Ulrich, Ralph Engel, Steffen Müller +2
Hadronic cross sections at ultra-high energy have a significant impact on the development of extensive air shower cascades. Therefore the interpretation of air shower data depends…
Sensitivity of Extensive Air Showers to Features of Hadronic Interactions at Ultra-High Energies
Ralf Ulrich, Ralph Engel, Steffen Müller +3
We study the dependence of extensive air shower development on the first hadronic interactions at ultra-high energies occurring in the startup phase of the air shower cascade. The…
Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
The Pierre Auger Collaboration, J. Abraham, P. Abreu +458
From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (a…
Composition Studies with the Pierre Auger Observatory
Michael Unger
We report on studies of the composition of ultra high energy cosmic rays with the Pierre Auger Observatory. The detection of longitudinal air shower profiles with the fluorescence…