Search for patterns by combining cosmic-ray energy and arrival directions at the Pierre Auger Observatory

• Autor(a) principal: Pierre Auger collaboration (486 authors)
• Data de Publicação: 2015
• Outros Autores: Abreu, Pedro, Andringa, Sofia, Assis, Pedro, Brogueira, Pedro, Cazon, Lorenzo, Conceição, Ruben, Diogo, Francisco, Espadanal, Joao, Gonçalves, Patrícia, Oliveira, Micael, Pimenta, Mário, Santo, Catarina E, Santos, Eva, Sarmento, Raul, Tomé, Bernardo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.26/26697

Energy-dependent patterns in the arrival directions of cosmic rays are searched for using data of the Pierre Auger Observatory. We investigate local regions around the highest-energy cosmic rays with $E \ge 6 \times 10^{19}$ eV by analyzing cosmic rays with energies above $E \ge 5 \times 10^{18}$ eV arriving within an angular separation of approximately 15$^{\circ }$ . We characterize the energy distributions inside these regions by two independent methods, one searching for angular dependence of energy-energy correlations and one searching for collimation of energy along the local system of principal axes of the energy distribution. No significant patterns are found with this analysis. The comparison of these measurements with astrophysical scenarios can therefore be used to obtain constraints on related model parameters such as strength of cosmic-ray deflection and density of point sources.