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Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory
- Source :
- Astroparticle Physics, 31, 399-406, Digital.CSIC. Repositorio Institucional del CSIC, instname, SEDICI (UNLP), Universidad Nacional de La Plata, instacron:UNLP, Digibug. Repositorio Institucional de la Universidad de Granada, Astroparticle Physics, Astroparticle Physics, 2009, 31, pp.399-406. ⟨10.1016/j.astropartphys.2009.04.003⟩, The Pierre Auger Collaboration Pastor Carpi, Sergio Pinto, Teguayco 2009 Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory Astroparticle Physics 31 6 399 406, Astroparticle Physics, 31(6), 399-406. Elsevier, Astroparticle Physics, Elsevier, 2009, 31, pp.399-406. ⟨10.1016/j.astropartphys.2009.04.003⟩, RODERIC. Repositorio Institucional de la Universitat de Valéncia, Astroparticle Physics, 31, 6, pp. 399-406
- Publication Year :
- 2009
-
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 equivalent to 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.<br />The successful installation and commissioning of the Pierre Auger Observatory would not have been possible without the strong commitment and effort from the technical and administrative staff in Malargüe. We are very grateful to the following agencies and organizations for financial support: Comisión Nacional de Energía Atómica, Fundación Antorchas, Gobierno De La Provincia de Mendoza, Municipalidad de Malargüe, NDM Holdings and Valle Las Leñas, in gratitude for their continuing cooperation over land access, Argentina; the Australian Research Council; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Financiadora de Estudos e Projetos (FINEP), Fundaçao de Amparo à Pesquisa do Estado de Rio de Janeiro (FAPERJ), Fundaçao de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP), Ministério de Ciência e Tecnologia (MCT), Brazil; AVCR AV0Z10100502 and AV0Z10100522, GAAV KJB300100801 and KJB100100904, MSMT-CR LA08016, LC527, 1M06002, and MSM0021620859, Czech Republic; Centre de Calcul IN2P3/CNRS, Centre National de la Recherche Scientifique (CNRS), Conseil Régional Ile-de-France, Département Physique Nucléaire et Corpusculaire (PNC-IN2P3/CNRS), Département Sciences de l’Univers (SDU-INSU/CNRS), France; Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Finanzministerium Baden- Württemberg, Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Ministerium für Wissenschaft und Forschung, Nordrhein-Westfalen, Ministerium für Wissenschaft, Forschung und Kunst, Baden-Württemberg, Germany; Istituto Nazionale di Fisica Nucleare (INFN), Ministero dell’Istruzione,dell’Università e della Ricerca (MIUR), Italy; Consejo Nacional de Ciencia y Tecnología (CONACYT), Mexico; Ministerie van Onderwijs, Cultuur en Wetenschap, Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Stichting voor Fundamenteel Onderzoek der Materie (FOM), Netherlands; Ministry of Science and Higher Education, Grant Nos. 1 P03 D 014 30, N202 090 31/0623, and PAP/218/2006, Poland; Fundaçao para a Ciência e a Tecnologia, Portugal; Ministry for Higher Education, Science, and Technology, Slovenian Research Agency, Slovenia; Comunidad de Madrid, Consejería de Educación de la Comunidad de Castilla La Mancha, FEDER funds, Ministerio de Ciencia e Innovación, Xunta de Galicia, Spain; Science and Technology Facilities Council, United Kingdom; Department of Energy, Contract No. DE-AC02-07CH11359, National Science Foundation, Grant No. 0450696, The Grainger Foundation USA; ALFA-EC / HELEN, European Union 6th Framework Program, Grant No. MEIF-CT-2005-025057, European Union 7th Framework Program, Grant No. PIEF-GA-2008-220240, and UNESCO.
- Subjects :
- [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
Photon
Astronomy
FOS: Physical sciences
Flux
Cosmic ray
Fotones
Astrophysics
EXTENSIVE AIR-SHOWERS
01 natural sciences
7. Clean energy
Nuclear physics
Cascada atmosférica
Ultra high energy (UHE)
0103 physical sciences
Limit (mathematics)
FLUORESCENCE
Ultra-high energy cosmic ray
010303 astronomy & astrophysics
DETECTOR
Cosmic rays
Ciencias Exactas
High Energy Astrophysical Phenomena (astro-ph.HE)
Pierre Auger Observatory
Physics
010308 nuclear & particles physics
[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
Física
Astronomy and Astrophysics
PROFILES
Radiación cósmica
Longitudinal development
13. Climate action
photon fraction
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Language :
- English
- ISSN :
- 09276505
- Database :
- OpenAIRE
- Journal :
- Astroparticle Physics, 31, 399-406, Digital.CSIC. Repositorio Institucional del CSIC, instname, SEDICI (UNLP), Universidad Nacional de La Plata, instacron:UNLP, Digibug. Repositorio Institucional de la Universidad de Granada, Astroparticle Physics, Astroparticle Physics, 2009, 31, pp.399-406. ⟨10.1016/j.astropartphys.2009.04.003⟩, The Pierre Auger Collaboration Pastor Carpi, Sergio Pinto, Teguayco 2009 Upper limit on the cosmic-ray photon fraction at EeV energies from the Pierre Auger Observatory Astroparticle Physics 31 6 399 406, Astroparticle Physics, 31(6), 399-406. Elsevier, Astroparticle Physics, Elsevier, 2009, 31, pp.399-406. ⟨10.1016/j.astropartphys.2009.04.003⟩, RODERIC. Repositorio Institucional de la Universitat de Valéncia, Astroparticle Physics, 31, 6, pp. 399-406
- Accession number :
- edsair.doi.dedup.....18d0cc63a9197c9c58269e1c7fa196a3
- Full Text :
- https://doi.org/10.1016/j.astropartphys.2009.04.003⟩