Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory

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doi:10.1016/j.astropartphys.2009.04.003

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Multitudinario:460 "Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory" (2009) Astroparticle Physics. 31(6):399-406

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Abstract:

From direct observations of the longitudinal development of ultra-high energy air showers performed with the Pierre Auger Observatory, upper limits of 3.8%, 2.4%, 3.5% and 11.7% (at 95% c.l.) are obtained on the fraction of cosmic-ray photons above 2, 3, 5 and 10 EeV (1 EeV ≡ 10 18 eV), respectively. These are the first experimental limits on ultra-high energy photons at energies below 10 EeV. The results complement previous constraints on top-down models from array data and they reduce systematic uncertainties in the interpretation of shower data in terms of primary flux, nuclear composition and proton-air cross-section. © 2009 Elsevier B.V. All rights reserved.

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Documento:	Artículo
Título:	Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
Autor:	Multitudinario:460
Filiación:	Centro Atómico Bariloche, Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, Argentina Centro Atomico Constituyentes (Comision Nacional de Energia Atomica/CONICET/UTN-FRBA), Buenos Aires, Argentina Centro de Investigaciones en Láseres y Aplicaciones, CITEFA, CONICET, Argentina Departamento de Física, FCEyN, Universidad de Buenos Aires, Argentina IFLP, Universidad Nacional de La Plata, CONICET, La Plata, Argentina Instituto de Astronomía y Física del Espacio (CONICET), Buenos Aires, Argentina Observatorio Meteorologico Parque Gral. San Martin (UTN- FRM/CONICET/CNEA), Mendoza, Argentina Pierre Auger Southern Observatory, Malargüe, Argentina Pierre Auger Southern Observatory and Comisión Nacional de Energía Atómica, Malargüe, Argentina University of Adelaide, Adelaide, SA, Australia Universidad Catolica de Bolivia, La Paz, Bolivia Universidad Mayor de San Andrés, Bolivia Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ, Brazil Pontifícia Universidade Católica, Rio de Janeiro, RJ, Brazil Universidade de Sao Paulo, Instituto de Fisica, Sao Paulo, SP, Brazil Universidade Estadual de Campinas, IFGW, Campinas, SP, Brazil Universidade Estadual de Feira de Santana, Brazil Universidade Estadual do Sudoeste da Bahia, Vitoria da Conquista, BA, Brazil Universidade Federal da Bahia, Salvador, BA, Brazil Universidade Federal, ABC, Santo André, SP, Brazil Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro, RJ, Brazil Universidade Federal Fluminense, Instituto de Fisica, Niterói, RJ, Brazil Charles University, Faculty of Mathematics and Physics, Institute of Particle and Nuclear Physics, Prague, Czech Republic Institute of Physics, the Academy of Sciences of the Czech Republic, Prague, Czech Republic Palacký University, Olomouc, Czech Republic Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris 11, CNRS-IN2P3, Orsay, France Laboratoire AstroParticule et Cosmologie (APC), Université Paris 7, CNRS-IN2P3, Paris, France Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris 11, CNRS-IN2P3, Orsay, France Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, Paris Cedex 05, France Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier, INPG, Grenoble, France SUBATECH, Nantes, France Bergische Universität Wuppertal, 42119 Wuppertal, Germany Forschungszentrum Karlsruhe, Institut für Kernphysik, Karlsruhe, Germany Forschungszentrum Karlsruhe, Institut für Prozessdatenverarbeitung und Elektronik, Germany Max-Planck-Institut für Radioastronomie, Bonn, Germany RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany Universität Karlsruhe (TH), Institut für Experimentelle Kernphysik (IEKP), Karlsruhe, Germany Universität Siegen, Siegen, Germany Dipartimento di Fisica dell'Università, INFN, Genova, Italy Università dell'Aquila, INFN, L'Aquila, Italy Università di Milano, Sezione INFN, Milan, Italy Dipartimento di Fisica dell'Università del Salento, Sezione INFN, Lecce, Italy Università di Napoli Federico II, Sezione INFN, Napoli, Italy Università di Roma II Tor Vergata, Sezione INFN, Roma, Italy Università di Catania, Sezione INFN, Catania, Italy Università di Torino, Sezione INFN, Torino, Italy Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (INAF), Palermo, Italy Istituto di Fisica dello Spazio Interplanetario (INAF), Università di Torino, Sezione INFN, Torino, Italy INFN, Laboratori Nazionali del Gran Sasso, Assergi, L'Aquila, Italy Benemérita Universidad Autónoma de Puebla, Puebla, Mexico Centro de Investigacion en Computo, IPN, México, D.F., Mexico Centro de Investigación y de Estudios Avanzados, IPN (CINVESTAV), México, D.F., Mexico Instituto Nacional de Astrofisica, Optica y Electronica, Tonantzintla, Puebla, Mexico Unidad Profesional Interdisciplinaria de Ingenieria y Tecnologia Avanzadas, IPN, Mexico, D.F., Mexico Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Universidad Nacional Autonoma de Mexico, Mexico, D.F., Mexico IMAPP, Radboud University, Nijmegen, Netherlands Kernfysisch Versneller Instituut, University of Groningen, Groningen, Netherlands NIKHEF, Amsterdam, Netherlands ASTRON, Dwingeloo, Netherlands Institute of Nuclear Physics PAN, Krakow, Poland University of Łódź, Łódz, Poland LIP, Instituto Superior Técnico, Lisboa, Portugal J. Stefan Institute, Ljubljana, Slovenia Laboratory for Astroparticle Physics, University of Nova Gorica, Slovenia Instituto de Física Corpuscular, CSIC-Universitat de València, Valencia, Spain Universidad Complutense de Madrid, Madrid, Spain Universidad de Alcalá, Alcalá de Henares, Madrid, Spain Universidad de Granada, C.A.F.P.E., Granada, Spain Universidad de Santiago de Compostela, Spain Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford, United Kingdom School of Physics and Astronomy, University of Leeds, United Kingdom Argonne National Laboratory, Argonne, IL, United States Case Western Reserve University, Cleveland, OH, United States Colorado School of Mines, Golden, CO, United States Colorado State University, Fort Collins, CO, United States Colorado State University, Pueblo, CO, United States Fermilab, Batavia, IL, United States Louisiana State University, Baton Rouge, LA, United States Michigan Technological University, Houghton, MI, United States New York University, New York, NY, United States Northeastern University, Boston, MA, United States Ohio State University, Columbus, OH, United States Pennsylvania State University, University Park, PA, United States Southern University, Baton Rouge, LA, United States University of California, Los Angeles, CA, United States University of Chicago, Enrico Fermi Institute, Chicago, IL, United States University of Hawaii, Honolulu, HI, United States University of Nebraska, Lincoln, NE, United States University of New Mexico, Albuquerque, NM, United States University of Pennsylvania, Philadelphia, PA, United States University of Wisconsin, Madison, WI, United States University of Wisconsin, Milwaukee, WI, United States Institute for Nuclear Science and Technology (INST), Hanoi, Viet Nam
Palabras clave:	Augers; Cosmology; Observatories; Photons; Air showers; Direct observations; Photon fraction; Pierre Auger observatory; Systematic uncertainties; Top down models; Ultra-high energies; Upper limits; Cosmic rays
Año:	2009
Volumen:	31
Número:	6
Página de inicio:	399
Página de fin:	406
DOI:	http://dx.doi.org/10.1016/j.astropartphys.2009.04.003
Título revista:	Astroparticle Physics
Título revista abreviado:	Astropart. Phys.
ISSN:	09276505
CODEN:	APHYE
Registro:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v31_n6_p399_Multitudinario

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Citas:

---------- APA ----------

(2009) . Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory. Astroparticle Physics, 31(6), 399-406.
http://dx.doi.org/10.1016/j.astropartphys.2009.04.003

---------- CHICAGO ----------

Multitudinario:460. "Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory" . Astroparticle Physics 31, no. 6 (2009) : 399-406.
http://dx.doi.org/10.1016/j.astropartphys.2009.04.003

---------- MLA ----------

Multitudinario:460. "Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory" . Astroparticle Physics, vol. 31, no. 6, 2009, pp. 399-406.
http://dx.doi.org/10.1016/j.astropartphys.2009.04.003

---------- VANCOUVER ----------

Multitudinario:460. Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory. Astropart. Phys. 2009;31(6):399-406.
http://dx.doi.org/10.1016/j.astropartphys.2009.04.003