Energy Spectrum of Ultrahigh-Energy Cosmic Rays across Declinations <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mo>−</mml:mo> <mml:mn>9</mml:mn> <mml:mn>0</mml:mn> <mml:mi>°</mml:mi> </mml:math> to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mo>+</mml:mo> <mml:mn>44.8</mml:mn> <mml:mi>°</mml:mi> </mml:math> as Measured at the Pierre Auger Observatory
Adila Abdul HalimUniversity of AdelaideP. AbreuUniversidade de Lisboa—ULM. AgliettaINFN, Sezione di TorinoI. AllekotteCentro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET)Kévin Almeida CheminantNationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF)A. AlmelaInstituto de Tecnologías en Detección y AstropartículasRoberto AloisioGran Sasso Science InstituteJaime Álvarez-MuñizUniversidade de Santiago de CompostelaAntonio AmbrosoneGran Sasso Science InstituteJuan Ammerman YebraUniversidade de Santiago de CompostelaG. A. AnastasiINFN, Sezione di CataniaL. AnchordoquiCity University of New YorkB. AndradaInstituto de Tecnologías en Detección y AstropartículasLuciana Andrade DouradoGran Sasso Science InstituteS. AndringaUniversidade de Lisboa—ULL. ApollonioINFN, Sezione di MilanoC. AramoINFN, Sezione di NapoliE. ArnoneINFN, Sezione di TorinoJuan Carlos Arteaga VelázquezUniversidad Michoacana de San Nicolás de HidalgoP. AssisUniversidade de Lisboa—ULG. ÁvilaObservatorio Pierre Auger and Comisión Nacional de Energía AtómicaEmanuele AvoconeINFN Laboratori Nazionali del Gran SassoAlena BakalováInstitute of Physics of the Czech Academy of SciencesFelicia BarbatoGran Sasso Science InstituteAdriel Bartz MocellinColorado School of MinesJ. A. BellidoUniversity of AdelaideCorinne BératUniversité Grenoble AlpesM. E. BertainaINFN, Sezione di TorinoMarta BianciottoINFN, Sezione di TorinoPeter L. BiermannMax-Planck-Institut für RadioastronomieVirginia BinetInstituto de Física de Rosario (IFIR)Kathrin BismarkInstitute for Experimental Particle PhysicsTeresa BisterNationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF)Jonathan BiteauInstitut universitaire de France (IUF)Jiří BlažekInstitute of Physics of the Czech Academy of SciencesJ. BlümerInstitute for Astroparticle PhysicsM. BoháčováInstitute of Physics of the Czech Academy of SciencesDenise BoncioliINFN Laboratori Nazionali del Gran SassoC. BonifaziCONICETLuan Bonneau ArbeletcheUniversidade Estadual de Campinas (UNICAMP)Nataliia BorodaiInstitute of Nuclear Physics PANJ. BrackColorado State UniversityP. G. Brichetto OrcheraInstitute for Astroparticle PhysicsF. L. BriechleRWTH Aachen UniversityA. BuenoUniversidad de GranadaS. BuitinkVrije Universiteit BrusselsMario BuscemiINFN, Sezione di CataniaM. BüskenInstitute for Experimental Particle PhysicsAnthony BwembyaNationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF)K. S. Caballero‐MoraUniversidad Autónoma de ChiapasS. Cabana-FreireUniversidade de Santiago de CompostelaLorenzo CaccianigaINFN, Sezione di MilanoF. CampuzanoInstituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM)Jorge Caraça-ValenteColorado School of MinesR. CarusoINFN, Sezione di CataniaA. CastellinaINFN, Sezione di TorinoF. CatalaniUniversidade de São PauloG. CataldiINFN, Sezione di LecceLorenzo CazonUniversidade de Santiago de CompostelaM. CerdaObservatorio Pierre AugerBerenika ČermákováInstitute for Astroparticle PhysicsA. CermenatiGran Sasso Science InstituteJ. ChudobaInstitute of Physics of the Czech Academy of SciencesL. ChytkaPalacky UniversityR. W. ClayUniversity of AdelaideA. C. Cobos CeruttiInstituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM)Roberta ColalilloINFN, Sezione di NapoliR. ConceiçãoUniversidade de Lisboa—ULGiovanni ConsolatiINFN, Sezione di MilanoMarcelo ConteINFN, Sezione di LecceFabio ConvengaINFN Laboratori Nazionali del Gran SassoDiego Correia dos SantosUniversidade Federal do Rio de JaneiroP. J. CostaUniversidade de Lisboa—ULC. E. CovaultCase Western Reserve UniversityM. CristinzianiUniversität SiegenCarlo Salvattore Cruz SanchezUniversidad Nacional de La Plata and CONICETS. DassoInstituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA)K. DaumillerInstitute for Astroparticle PhysicsB. R. DawsonUniversity of AdelaideR. M. de AlmeidaUniversidade Federal do Rio de JaneiroE.-T. de BooneUniversität SiegenBeatriz de ErricoUniversidade Federal do Rio de JaneiroJoaquín de JesúsInstitute for Astroparticle PhysicsS. J. de JongNationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF)J. R. T. de Mello NetoUniversidade Federal do Rio de JaneiroI. De MitriGran Sasso Science InstituteJ. de OliveiraInstituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro (IFRJ)Danelise de Oliveira FrancoUniversität HamburgFrancesco PalmaINFN, Sezione di LecceV. de SouzaUniversidade de São PauloEmanuele De VitoINFN, Sezione di LecceA. Del PopoloINFN, Sezione di CataniaO. DelignyCNRSN. DennerInstitute of Physics of the Czech Academy of SciencesL. DevalINFN, Sezione di TorinoA. di MatteoINFN, Sezione di TorinoC. DobrigkeitUniversidade Estadual de Campinas (UNICAMP)Juan Carlos D’OlivoUniversidad Nacional Autónoma de MéxicoLuis Miguel Domingues MendesCentro Brasileiro de Pesquisas Fisicas
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Annotatsiya
The energy spectrum of cosmic rays above 2.5 EeV has been measured across the declination range -90°≤δ≤+44.8° using ∼310 000 events accrued at the Pierre Auger Observatory from an exposure of (104 900±3 100) km^{2} sr yr. No significant variations of energy spectra with declination are observed, after allowing or not for nonuniformities across the sky arising from the well-established dipolar anisotropies in the arrival directions of ultrahigh-energy cosmic rays. The instep feature in the spectrum at ≃10 EeV reported previously is now established at a significance above 5σ. Within the statistics, the energy spectra are indistinguishable across declinations so disfavoring an origin for the instep from a few distinctive sources.
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