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Showing 2009 · astro-ph.HEShow all
3 papers · 2 filters
astro-ph.HE2009★ 150 cited
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…
astro-ph.HE2009★ 1 cited
On Estimating the Flux of the Brightest Cosmic Ray Source above 57x10^18 eV
Patrick Younk
The sources of ultra-high energy cosmic rays are not yet known. However, the discovery of anisotropic cosmic rays above 57x10^18 eV by the Pierre Auger Observatory suggests that a…
astro-ph.HE2009★ 133 cited
Limit on the diffuse flux of ultra-high energy tau neutrinos with the surface detector of the Pierre Auger Observatory
The Pierre Auger Collaboration
Data collected at the Pierre Auger Observatory are used to establish an upper limit on the diffuse flux of tau neutrinos in the cosmic radiation. Earth-skimming may interact…