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Measurement of the energy spectrum of cosmic rays above 1018 eV using the Pierre Auger Observatory

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Journal 01 Mar 2010Embargo end date: 01 Jan 2010 Italy, Italy, Italy, Spain, Italy, Croatia, Italy, Netherlands, Italy, France, Spain, Italy, Netherlands, Croatia, Croatia, Spain, Italy, Netherlands, Germany, Netherlands, United Kingdom, Croatia Publisher:Elsevier BVJournal:Physics Letters B, volume 685, pages 239-246 (issn: 0370-2693,

Authors: P. Abreu; Peter Buchholz; J. W. Cronin; G. De La Vega; Jeffrey Brack; A. Lucero; V. H. Ponce; +193 Authors

P. Abreu; Peter Buchholz; J. W. Cronin; G. De La Vega; Jeffrey Brack; A. Lucero; V. H. Ponce; Jose Chinellato; Lorenzo Cazon; Lorenzo Cazon; C. L. Williams; Jaime Rosado; V. de Souza; A. Redondo; U. Giaccari; Maurice Stephan; F. Suarez; E. D. Fraenkel; M. Nyklicek; H. Schieler; Michael Urban; J. Abraham; I. Zaw; A. Tamashiro; N. Palmieri; S. J. De Jong; C. Robledo; Paolo Privitera; R. F. Gamarra; Heino Falcke; Heino Falcke; O. Krömer; Ernesto Arganda; D. Thomas; R. Cester; Alan Watson; J. Pallotta; Ralph Engel; C. J.W.P. Timmermans; J. Schovancova; C. Delle Fratte; T. Karova; F. Ionita; P. Ristori; G. Navarra; L. Nožka; Michael DuVernois; C. Macolino; O. Blanch-Bigas; B. J. Whelan; J. J. Beatty; V. Pirronello; J. Oehlschläger; A.M. van den Berg; G. Medina-Tanco; M. Prouza; M. Pontz; M. Kaducak; German Ros; A. Segreto; A. Della Selva; S. R. Gozzini; J. R. Vázquez; L. Voyvodic; C. Meurer; M. Ludwig; Karen S. Caballero-Mora; C. Di Giulio; Jiri Chudoba; M. Hussain; Sasa Micanovic; P. L. Ghia; P. L. Ghia; E. M. Santos; Warner A. Miller; K. D. de Vries; D. Kruppke-Hansen; J. Stasielak; A. Chou; A. Chou; G. Farrar; E. Santos; A. Menshikov; O. Martínez Bravo; X. Garrido; M. De Domenico; Dariusz Gora; Dariusz Gora; J. Lozano Bahilo; M. Monasor; M. Monasor; Sofia Andringa; U. Fröhlich; A. Ferrero; Rossella Caruso; S. Dagoret-Campagne; A. Letessier-Selvon; Y. Petrov; M. Ambrosio; S. Parlati; J. Coppens; S. L.C. Barroso; L. Perrone; A. Cordier; Lisa M. Goggin; A. Parra; Graciela B. Gelmini; Humberto Ibarguen Salazar; C. Lachaud; Domenico Tegolo; Domenico Tegolo; B. L. Lago; T. Paul; C. De Donato; C. De Donato; Y. Guardincerri; J. C. Diaz; H. Lyberis; H. Schoorlemmer; C. Bleve; Fabian Schmidt; D. B. Tridapalli; Markus Roth; Paulo J. S. Gonçalves; A. Tamburro; P. Mantsch; Pedro Brogueira; Onofrio A. Catalano; P. Schiffer; E. J. Quel; Azadeh Keivani; Iván Sidelnik; E. Moreno; J. Chauvin; Dusan Mandat; G. Wieczorek; R. A. Vázquez; Daniel Omar Badagnani; R. Knapik; J. R. T. de Mello Neto; Ivor Fleck; Piotr Homola; T. Yamamoto; D. Melo; M. Pimenta; Thomas Hebbeker; T. Bergmann; T. Antičić; Olaf Scholten; Maria-Teresa Dova; Kai Daumiller; A. F. Barbosa; Balázs Kégl; M. Risse; M. Risse; Pascal Lautridou; H. Wilczyński; F. Arqueros; Gualberto Avila; S. Westerhoff; N. Nierstenhoefer; J. F. Valdés Galicia; S. J. Sciutto; G. P. Guedes; D. Pakk Selmi-Dei; V. M. Olmos-Gilbaja; Peter L. Biermann; D. Monnier Ragaigne; Ralf Ulrich; Ralf Ulrich; T. Rossler; Pham Ngoc Diep; R. M. de Almeida; G. Matthiae; Silvia Mollerach; C. Pfendner; Alain Hervé; Hernan Wahlberg; A. Chiavassa; D. Nitz; J. Allen; Sergio Pastor; Tonia M. Venters; Pietro Oliva; V. Scherini; N. Kunka; K. B. Barber; G. Rodriguez; G. Rodriguez; R. López; G. Decerprit; E. Trovato; B. Revenu; Xavier Bertou; M. Blanco; W. J. M. de Mello Junior; M. Palatka; D. Tcherniakhovski; A. Stutz; F. Schroeder;

Measurement of the energy spectrum of cosmic rays above 1018 eV using the Pierre Auger Observatory

- Summary
- Subjects

Abstract

We report a measurement of the flux of cosmic rays with unprecedented precision and statistics using the Pierre Auger Observatory. Based on fluorescence observations in coincidence with at least one surface detector we derive a spectrum for energies above 10^18 eV. We also update the previously published energy spectrum obtained with the surface detector array. The two spectra are combined addressing the systematic uncertainties and, in particular, the influence of the energy resolution on the spectral shape. The spectrum can be described by a broken power law E^-gamma with index gamma=3.3 below the ankle which is measured at log10(E/eV) = 18.6. Above the ankle the spectrum is described by a power law with index 2.6 followed by a flux suppression, above about log10(E/eV) = 19.5, detected with high statistical significance.

Accepted for publication in Physics Letters B

Countries

Italy, Italy, Italy, Spain, Italy, Croatia, Italy, Netherlands, Italy, France, Spain, Italy, Netherlands, Croatia, Croatia, Spain, Italy, Netherlands, Germany, Netherlands, United Kingdom, Croatia

Related Organizations

University of Chicago
United States
University of Adelaide
Australia
University of São Paulo
Brazil
National University of La Plata
Argentina
Case Western Reserve University
United States

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Keywords

Photon fraction, System, [SDU.ASTR.HE] Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astronomy, [PHYS.ASTR.HE] Physics/Astrophysics/High Energy Astrophysical Phenomena, UPPER LIMIT, PHOTON FRACTION, [SDU.ASTR.HE] Sciences of the Universe/Astrophysics/High Energy Astrophysical Phenomena, info:eu-repo/classification/ddc/530, astro-ph.HE, High Energy Astrophysical Phenomena (astro-ph.HE), [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Physics, ddc:530, Pierre Auger Observatory, 520, ELECTRONS, SIMULATION, Física nuclear, Astrophysics - High Energy Astrophysical Phenomena, Cosmic rays; Energy spectrum; Pierre Auger Observatory, Simulation, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Showers, 539.1, energy spectrum, FOS: Physical sciences, Electrons, SURFACE DETECTOR, 530, cosmic rays, SHOWERS, Cosmic rays, Array., Surface detector, Upper limit, [ PHYS.ASTR.HE ] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Física, 2207 Física Atómica y Nuclear, Pierre Auger Observatory; cosmic rays; energy spectrum, High-Energy Cosmic Rays; Pierre Auger Observatory; Energy Spectrum, Pierre Auger Observatory; Cosmic rays; Energy spectrum, Experimental High Energy Physics, ARRAY, Energy spectrum, [ SDU.ASTR.HE ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [PHYS.ASTR.HE] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], SYSTEM