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

A Aab, Universität Siegen, Siegen, Germany.
P Abreu, Laboratório de Instrumentação e Física Experimental de Partículas - LIP and Instituto Superior Técnico - IST, Universidade de Lisboa - UL, Lisbon, Portugal.
M Aglietta, Osservatorio Astrofisico di Torino (INAF), Università di Torino and Sezione INFN, Torino, Italy.
E J. Ahn, Fermilab, Batavia, IL USA.
I Al Samarai, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris 11, CNRS-IN2P3, Orsay, France.
I F. Albuquerque, Instituto de Física, Universidade de São Paulo, São Paulo, SP Brazil.
I Allekotte, Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, Argentina.
J Allen, New York University, New York, NY USA.
P Allison, Ohio State University, Columbus, OH USA.
A Almela, Instituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina ; Universidad Tecnológica Nacional - Facultad Regional Buenos Aires, Buenos Aires, Argentina.
J Alvarez Castillo, Universidad Nacional Autonoma de Mexico, Mexico, D.F., Mexico.
J Alvarez-Muñiz, Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
R Alves Batista, Universität Hamburg, Hamburg, Germany.
M Ambrosio, Università di Napoli "Federico II" and Sezione INFN, Napoli, Italy.
A Aminaei, IMAPP, Radboud University Nijmegen, Nijmegen, Netherlands.
L Anchordoqui, Department of Physics and Astronomy, City University of New York, New York, USA.
S Andringa, Laboratório de Instrumentação e Física Experimental de Partículas - LIP and Instituto Superior Técnico - IST, Universidade de Lisboa - UL, Lisbon, Portugal.
C Aramo, Università di Napoli "Federico II" and Sezione INFN, Napoli, Italy.
V M. Aranda, Universidad Complutense de Madrid, Madrid, Spain.
F Arqueros, Universidad Complutense de Madrid, Madrid, Spain.
H Asorey, Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, Argentina.
P Assis, Laboratório de Instrumentação e Física Experimental de Partículas - LIP and Instituto Superior Técnico - IST, Universidade de Lisboa - UL, Lisbon, Portugal.
J Aublin, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, Paris, France.
M Ave, Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
M Avenier, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Grenoble-Alpes, CNRS/IN2P3, Grenoble, France.
G Avila, Observatorio Pierre Auger and Comisión Nacional de Energía Atómica, Malargüe, Argentina.
N Awal, New York University, New York, NY USA.
A M. Badescu, University Politehnica of Bucharest, Bucharest, Romania.
K B. Barber, University of Adelaide, Adelaide, SA Australia.
J Bäuml, Karlsruhe Institute of Technology - Campus South - Institut für Experimentelle, Kernphysik (IEKP), Karlsruhe, Germany.
C Baus, Karlsruhe Institute of Technology - Campus South - Institut für Experimentelle, Kernphysik (IEKP), Karlsruhe, Germany.
J J. Beatty, Ohio State University, Columbus, OH USA.
K H. Becker, Bergische Universität Wuppertal, Wuppertal, Germany.

Abstract

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 [Formula: see text] eV by analyzing cosmic rays with energies above [Formula: see text] eV arriving within an angular separation of approximately 15[Formula: see text]. 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.