Latest results from the Pierre Auger Observatory
Abstract
Recent results obtained with the Pierre Auger Observatory are described. These include measurements of the spectrum, anisotropies and composition of ultra-high energy cosmic rays. The ankle of the spectrum is measured at ~eV and a suppression above ~eV consistent with the GZK effect is observed. At energies above ~eV a correlation with the distribution of nearby extragalactic objects is found, including an excess around the direction of Centaurus~A, the nearest radio loud active galaxy. Measurements of the depth of shower maximum and its fluctuations suggest a gradual change in the average mass of the primary cosmic rays (under standard extrapolations of hadronic interaction models), being the results consistent with a light composition consisting mostly of protons at few~eV and approaching the expectations from iron nuclei at ~eV. Upper bounds on the photon fraction and the neutrino fluxes are also obtained.
Keywords
Cite
@article{arxiv.1101.1825,
title = {Latest results from the Pierre Auger Observatory},
author = {Esteban Roulet},
journal= {arXiv preprint arXiv:1101.1825},
year = {2015}
}
Comments
Talk given at Quarks, Strings and the Cosmos, Hector Rubinstein Memorial Symposium, August 9-11 2010