Searches for Anisotropies in the Arrival Directions of the Highest Energy Cosmic Rays Detected by the Pierre Auger Observatory
A. AabUniversitat SiegenP. AbreuLaboratório de Instrumentação e Física Experimental de Partículas (LIP) and Instituto Superior Técnico (IST), Universidade de Lisboa (UL), PortugalM. AgliettaOsservatorio Astrofisico di Torino (INAF), Università di Torino and Sezione INFN, Torino, ItalyE. J. AhnFermi National Accelerator Laboratory (Fermilab)I. Al SamaraiInstitut National de Physique Nucléaire et de Physique des ParticulesI. F. M. AlbuquerqueI. AllekotteBalseiro InstituteJ. AllenP. AllisonOhio State University, Columbus, OH, USAA. AlmelaInstituto de Tecnologías en Detección y AstropartículasJ Segura del CastilloUniversidad Nacional Autónoma de MéxicoJ. Alvarez-MuñizUniversidad de Santiago de CompostelaR. Alves BatistaUniversity of HamburgM. AmbrosioUniversità degli Studi di Napoli "Federico II"A. AminaeiRadboud University NijmegenL. AnchordoquiCity University of New YorkS. AndringaLIP - Laboratory of Instrumentation and Experimental Particle PhysicsC. AramoUniversità degli Studi di Napoli "Federico II"V.M. ArandaUniversidad Complutense de MadridF. ArquerosUniversidad Complutense de MadridH. AsoreyCentro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET)P. AssisLIP - Laboratory of Instrumentation and Experimental Particle PhysicsJ. AublinInstitut National de Physique Nucléaire et de Physique des ParticulesM. AveBalseiro InstituteM. AvenierUniversité Grenoble AlpesG. AvilaObservatorio Pierre Auger and Comisión Nacional de Energía Atómica, Malargüe, ArgentinaN. AwalDepartment of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York 10016, USAA. M. BadescuUniversity Politehnica of BucharestK. B. BarberUniversity of AdelaideJ BäumlKarlsruhe Institute of TechnologyC. BausKarlsruhe Institute of TechnologyJ. J. BeattyOhio State University, Columbus, OH, USAK.-H. BeckerBergische Universität Wuppertal, Wuppertal, GermanyJ. A. BellidoUniversity of AdelaideC. BeratUniversité Grenoble AlpesM. E. BertainaOsservatorio Astrofisico di Torino (INAF), Università di Torino and Sezione INFN, Torino, ItalyX. BertouBariloche Atomic CentreP. L. BiermannMax-Planck-Institut für Radioastronomie, Bonn, GermanyP. BilloirInstitut National de Physique Nucléaire et de Physique des ParticulesS. G. BlaessUniversity of AdelaideM. BlancoSorbonne UniversitéC. BleveIstituto Nazionale di Fisica Nucleare, Sezione di LecceH. BlümerKarlsruhe Institute of TechnologyM. BoháčováInstitute of Physics of the Academy of Sciences of the Czech Republic, Prague, Czech RepublicD. BoncioliINFN, Laboratori Nazionali del Gran SassoC. BonifaziUniversidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro, RJ, BrazilR. BoninoOsservatorio Astrofisico di Torino (INAF), Università di Torino and Sezione INFN, Torino, ItalyN. BorodaiInstitute of Nuclear Physics PANJ. BrackColorado State UniversityI. Brancus'Horia Hulubei' National Institute for Physics and Nuclear Engineering, Bucharest- Magurele, RomaniaA. BridgemanKarlsruhe Institute of TechnologyP. BrogueiraLIP - Laboratory of Instrumentation and Experimental Particle PhysicsW. C. BrownColorado State UniversityP. BuchholzUniversitat SiegenA. BuenoUniversidad de Granada and C.A.F.P.E., Granada, SpainS. BuitinkRadboud University NijmegenM. BuscemiUniversità degli Studi di Napoli "Federico II"K. S. Caballero-MoraCentro de Investigación y de Estudios Avanzados del IPN (CINVESTAV), México, MexicoB. CaccianigaUniversità di Milano and Sezione INFN, Milan, ItalyL. CaccianigaLaboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, Paris, FranceM. CandussoUniversità di Roma II "Tor Vergata" and Sezione INFN, Roma, ItalyL. CarameteMax-Planck-Institut für Radioastronomie, Bonn, GermanyR. CarusoUniversità di Catania and Sezione INFN, Catania, ItalyA. CastellinaOsservatorio Astrofisico di Torino (INAF), Università di Torino and Sezione INFN, Torino, ItalyG. CataldiIstituto Nazionale di Fisica Nucleare, Sezione di LecceL. CazonLaboratório de Instrumentação e Física Experimental de Partículas (LIP) and Instituto Superior Técnico (IST), Universidade de Lisboa (UL), PortugalR. CesterUniversità di Torino and Sezione INFN, Torino, ItalyA. G. ChavezUniversidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, MexicoA. ChiavassaOsservatorio Astrofisico di Torino (INAF), Università di Torino and Sezione INFN, Torino, ItalyJ. ChinellatoUniversidade Estadual de CampinasJ. ChudobaInstitute of Physics of the Academy of Sciences of the Czech Republic, Prague, Czech RepublicM. CilmoUniversità degli Studi di Napoli "Federico II"R. W. ClayUniversity of AdelaideG. CoccioloIstituto Nazionale di Fisica Nucleare, Sezione di LecceR ColalilloUniversità degli Studi di Napoli "Federico II"A. ColemanPennsylvania State University, University Park, PA, USAL. CollicaUniversità di Milano and Sezione INFN, Milan, ItalyM. R. ColucciaIstituto Nazionale di Fisica Nucleare, Sezione di LecceR. ConceiçãoLIP - Laboratory of Instrumentation and Experimental Particle PhysicsF. ContrerasObservatorio Pierre Auger, Malargüe, ArgentinaM. J. CooperUniversity of AdelaideA. CordierUniversité Paris-SaclayS. CoutuPennsylvania State University, University Park, PA, USAC. E. CovaultCase Western Reserve University, Cleveland, OH, USAJ. CroninThe University of ChicagoA. CurutiuMax-Planck-Institut für Radioastronomie, Bonn, GermanyR. DallierLaboratoire de Physique Subatomique et des Technologies AssociéesB. DanielUniversidade Estadual de CampinasS. DassoInstitute of Astronomy and Space PhysicsK. DaumillerKarlsruhe Institute of TechnologyB. R. DawsonUniversity of AdelaideR.M. De AlmeidaUniversidade Federal FluminenseM. De DomenicoUniversità di Catania and Sezione INFN, Catania, ItalyS. J. de JongRadboud University NijmegenJ. R. T. de Mello NetoUniversidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro, RJ, BrazilI. De MitriIstituto Nazionale di Fisica Nucleare, Sezione di LecceJ. de OliveiraUniversidade Federal FluminenseV. de SouzaL. Del PeralUniversidad de Alcalá, Alcalá de Henares (Madrid), SpainO. DelignyInstitut National de Physique Nucléaire et de Physique des Particules
2015en
ABI
Annotatsiya
We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from -90{}^\circ to +45{}^\circ in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the Véron-Cetty and Véron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. We search for localized excess fluxes, self-clustering of event directions at angular scales up to 30°, and different threshold energies between 40 and 80 EeV. We then look for correlations of cosmic rays with celestial structures both in the Galaxy (the Galactic Center and Galactic Plane) and in the local universe (the Super-Galactic Plane). We also examine their correlation with different populations of nearby extragalactic objects: galaxies in the 2MRS catalog, AGNs detected by Swift-BAT, radio galaxies with jets, and the Centaurus A (Cen A) galaxy. None of the tests show statistically significant evidence of anisotropy. The strongest departures from isotropy (post-trial probability ∼ 1.4%) are obtained for cosmic rays with E\gt 58 EeV in rather large windows around Swift AGNs closer than 130 Mpc and brighter than 1044 erg s‑1 (18° radius), and around the direction of Cen A (15° radius).
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