Publication: Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 10(19) ev at the pierre auger observatory and the telescope array
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2014-10-20
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Abstract
Spherical harmonic moments are well-suited for capturing anisotropy at any scale in the flux of cosmic rays. An unambiguous measurement of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the northern and southern hemispheres. To this end, a joint analysis using data recorded at the Telescope Array and the Pierre Auger Observatory above 10(19) eV is presented in this work. The resulting multipolar expansion of the flux of cosmic rays allows us to perform a series of anisotropy searches, and in particular to report on the angular power spectrum of cosmic rays above 10(19) eV. No significant deviation from isotropic expectations is found throughout the analyses performed. Upper limits on the amplitudes of the dipole and quadrupole moments are derived as a function of the direction in the sky, varying between 7% and 13% for the dipole and between 7% and 10% for a symmetric quadrupole.
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© IOP Publising LTD 2014.
Autoría conjunta: Pierre Auger Collaboration. Artículo firmado por más de 400 autores.
We are very grateful to the following agencies and organizations for financial support: Comision Nacional de Energia Atomica; Fundacion Antorchas; Gobierno De La Provincia de Mendoza; Municipalidad de Malargue; NDM Holdings; Valle Las Lenas; Sao Paulo Research Foundation (FAPESP) [2010/07359-6, 1999/05404-3]; Ministerio de Ciencia e Tecnologia (MCT), Brazil; MSMT-CR [LG13007, 7AMB14AR005, CZ.1.05/2.1.00/03.0058]; Czech Science Foundation [14-17501S]; Czech Republic; Centre de Calcul IN2P3/CNRS; Centre National de la Recherche Scientifique (CNRS); Conseil Regional Ile-de-France; Departement Physique Nucleaire et Corpusculaire [PNC-IN2P3/CNRS]; Departement Sciences de l'Univers (SDU-INSU/CNRS); Institut Lagrange de Paris, France [ILP LABEX ANR-10-LABX-63, ANR-11-IDEX-0004-02]; Bundesministerium fur Bildung und Forschung (BMBF); Deutsche Forschungsgemeinschaft (DFG); Finanzministerium Baden-Wurttemberg; Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF); Ministerium fur Wissenschaft und Forschung; Nordrhein Westfalen; Ministerium fur Wissenschaft; Forschung und Kunst; Baden-Wurttemberg, Germany; Istituto Nazionale di Fisica Nucleare (INFN); Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR); Gran Sasso Center for Astroparticle Physics (CFA); CETEMPS Center of Excellence, Italy; Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico; Ministerie van Onderwijs; Cultuur en Wetenschap; Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO); Stichting voor Fundamenteel Onderzoek der Materie (FOM), The Netherlands; National Centre for Research and Development [ERA-NET-ASPERA/01/11, ERA-NET-ASPERA/02/11]; National Science Centre [2013/08/M/ST9/00322, 2013/08/M/ST9/00728]; HARMONIA, Poland [5 - 2013/10/M/ST9/00062]; Portuguese national funds; FEDER funds within COMPETE - Programa Operacional Factores de Competitividade through Fundacao para a Ciencia e a Tecnologia, Portugal; Romanian Authority for Scientific Research ANCS; CNDI-UEFISCDI partnership projects [20/2012, 194/2012, 1/ASPERA2/2012 ERA-NET, PN-II-RU-PD-2011-3-0145-17, PN-II-RU-PD-2011-3-0062]; Minister of National Education, Programme for research-Space Technology and Advanced Research-STAR, Romania [83/2013]; Slovenian Research Agency, Slovenia; Comunidad de Madrid, FEDER funds, Ministerio de Educacion y Ciencia, Xunta de Galicia, European Community 7th Framework Program, Spain [FP7-PEOPLE-2012-IEF-328826]; Science and Technology Facilities Council, United Kingdom; Department of Energy [DE-AC02-07CH11359, DE-FR02-04ER41300, DE-FG02-99ER41107]; National Science Foundation [0450696]; Grainger Foundation, USA; NAFOSTED, Vietnam; Marie Curie-IRSES/EPLANET, European Particle Physics Latin American Network, European Union [PIRSES-2009-GA-246806]; UNESCO; Institute for Cosmic Ray Research [21000002, 19104006]; Inter-University Research Program of the Institute for Cosmic Ray Research; U.S. National Science Foundation [PHY-0307098, PHY-0601915, PHY-0649681, PHY-0703893, PHY-0758342, PHY-0848320, PHY-1069280, PHY-1069286]; National Research Foundation of Korea [2007-0093860, R32-10130, 2012R1A1A2008381, 2013004883]; Russian Academy of Sciences, RFBR [11-02-01528a, 13-02-01311a]; IISN project [4.4509.10]; Belgian Science Policy under IUAP [VII/37]; Economic Development Board; University of Utah through the Office of the Vice President for Research
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