Searches for Anisotropies in the Arrival Directions of the Highest Energy Cosmic Rays Detected by the Pierre Auger Observatory
In: ISSN: 0004-637X, 2015
academicJournal
Zugriff:
See paper for full list of authors ; International audience ; 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∘ to +45∘ in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the V\'eron-Cetty and V\'eron 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 and for self-clustering of event directions at angular scales up to 30∘ and for different threshold energies between 40~EeV 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 galaxy. None of the tests shows a statistically significant evidence of anisotropy. The strongest departures from isotropy (post-trial probability ∼1.4\%) are obtained for cosmic rays with E>58~EeV in rather large windows around Swift AGNs closer than 130~Mpc and brighter than 1044~erg/s (18∘ radius) and around the direction of Centaurus~A (15∘ radius).
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Searches for Anisotropies in the Arrival Directions of the Highest Energy Cosmic Rays Detected by the Pierre Auger Observatory
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Autor/in / Beteiligte Person: | Aab, A. ; Avenier, M. ; Berat, C. ; Le Coz, S. ; Lebrun, D. ; Louedec, K. ; Montanet, F. ; Stutz, A. ; Dallier, Richard ; Gate, F. ; Lautridou, Pascal ; Maller, J. ; Marin, V. ; Martin, Lilian ; Ravel, O. ; Revenu, Benoît ; Samarai, Imen Al ; Deligny, O. ; Lhenry-Yvon, I. ; Martraire, D. ; Salamida, F. ; Suomijärvi, T. ; Cordier, A. ; Garcia-Gamez, D. ; Kégl, Balázs ; Ragaigne, D. Monnier ; Veberic, D. ; Laboratoire de Physique Subatomique et de Cosmologie (LPSC) ; Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS) ; Unité Scientifique de la Station de Nançay (USN) ; Observatoire des Sciences de l'Univers en région Centre (OSUC) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire SUBATECH Nantes (SUBATECH) ; Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) ; Institut de Physique Nucléaire d'Orsay (IPNO) ; Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire de l'Accélérateur Linéaire (LAL) ; Auger, Pierre ; ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011) ; European Project: 246806,EC:FP7:PEOPLE,FP7-PEOPLE-2009-IRSES,EPLANET(2011) ; European Project: 328826,EC:FP7:PEOPLE,FP7-PEOPLE-2012-IEF,AUGER2FUTURE(2013) |
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Zeitschrift: | ISSN: 0004-637X, 2015 |
Veröffentlichung: | HAL CCSD ; American Astronomical Society, 2015 |
Medientyp: | academicJournal |
DOI: | 10.1088/0004-637X/804/1/15 |
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