Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory

A method is developed to search for air showers initiated by photons using data recorded by the surface detector of the Auger Observatory. The approach is based on observables sensitive to the longitudinal shower development, the signal risetime and the curvature of the shower front. Applying this m...

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Publicado:	2008
Materias:	Auger electron spectroscopy Cosmic rays Molecular modeling Particle detectors Air showers Exotic models Photon flux Surface detectors Photons
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v29_n4_p243_Multitudinario http://hdl.handle.net/20.500.12110/paper_09276505_v29_n4_p243_Multitudinario
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09276505_v29_n4_p243_Multitudinario
record_format	dspace
spelling	paper:paper_09276505_v29_n4_p243_Multitudinario2023-06-08T15:51:51Z Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory Auger electron spectroscopy Cosmic rays Molecular modeling Particle detectors Air showers Exotic models Photon flux Surface detectors Photons A method is developed to search for air showers initiated by photons using data recorded by the surface detector of the Auger Observatory. The approach is based on observables sensitive to the longitudinal shower development, the signal risetime and the curvature of the shower front. Applying this method to the data, upper limits on the flux of photons of 3.8 × 10- 3, 2.5 × 10- 3, and 2.2 × 10- 3 km- 2 sr- 1 yr- 1 above 1019 eV, 2 × 1019 eV, and 4 × 1019 eV are derived, with corresponding limits on the fraction of photons being 2.0%, 5.1%, and 31% (all limits at 95% c.l.). These photon limits disfavor certain exotic models of sources of cosmic rays. The results also show that the approach adopted by the Auger Observatory to calibrate the shower energy is not strongly biased by a contamination from photons. © 2008 Elsevier B.V. All rights reserved. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v29_n4_p243_Multitudinario http://hdl.handle.net/20.500.12110/paper_09276505_v29_n4_p243_Multitudinario
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Auger electron spectroscopy Cosmic rays Molecular modeling Particle detectors Air showers Exotic models Photon flux Surface detectors Photons
spellingShingle	Auger electron spectroscopy Cosmic rays Molecular modeling Particle detectors Air showers Exotic models Photon flux Surface detectors Photons Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory
topic_facet	Auger electron spectroscopy Cosmic rays Molecular modeling Particle detectors Air showers Exotic models Photon flux Surface detectors Photons
description	A method is developed to search for air showers initiated by photons using data recorded by the surface detector of the Auger Observatory. The approach is based on observables sensitive to the longitudinal shower development, the signal risetime and the curvature of the shower front. Applying this method to the data, upper limits on the flux of photons of 3.8 × 10- 3, 2.5 × 10- 3, and 2.2 × 10- 3 km- 2 sr- 1 yr- 1 above 1019 eV, 2 × 1019 eV, and 4 × 1019 eV are derived, with corresponding limits on the fraction of photons being 2.0%, 5.1%, and 31% (all limits at 95% c.l.). These photon limits disfavor certain exotic models of sources of cosmic rays. The results also show that the approach adopted by the Auger Observatory to calibrate the shower energy is not strongly biased by a contamination from photons. © 2008 Elsevier B.V. All rights reserved.
title	Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory
title_short	Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory
title_full	Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory
title_fullStr	Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory
title_full_unstemmed	Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory
title_sort	upper limit on the cosmic-ray photon flux above 1019 ev using the surface detector of the pierre auger observatory
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09276505_v29_n4_p243_Multitudinario http://hdl.handle.net/20.500.12110/paper_09276505_v29_n4_p243_Multitudinario
_version_	1768543042702147584

Upper limit on the cosmic-ray photon flux above 1019 eV using the surface detector of the Pierre Auger Observatory

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