Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/54505
Type: Artigo de periódico
Title: An upper limit to the photon fraction in cosmic rays above 10(19) eV from the Pierre Auger Observatory
Author: Abraham, J
Aglietta, M
Aguirre, C
Allard, D
Allekotte, I
Allison, P
Alvarez, C
Alvarez-Muniz, J
Ambrosio, M
Anchordoqui, L
Anjos, JC
Aramo, C
Arisaka, K
Armengaud, E
Arneodo, F
Arqueros, F
Asch, T
Asorey, H
Atulugama, BS
Aublin, J
Ave, M
Avila, G
Bacelar, J
Backer, T
Badagnani, D
Barbosa, AF
Barbosa, HMJ
Barkhausen, M
Barnhill, D
Barroso, SLC
Bauleo, P
Beatty, J
Beau, T
Becker, BR
Becker, KH
Bellido, JA
BenZvi, S
Berat, C
Bergmann, T
Bernardini, P
Bertou, X
Biermann, PL
Billoir, P
Blanch-Bigas, O
Blanco, F
Blasi, P
Bleve, C
Blumer, H
Boghrat, P
Bohacova, M
Bonifazi, C
Bonino, R
Boratav, M
Brack, J
Brunet, JM
Buchholz, P
Busca, NG
Caballero-Mora, KS
Cai, B
Camin, DV
Capdevielle, JN
Caruso, R
Castellina, A
Cataldi, G
Cazon, L
Cester, R
Chauvin, J
Chiavassa, A
Chinellato, JA
Chou, A
Chye, J
Claes, D
Clark, PDJ
Clay, RW
Clay, SB
Connolly, B
Cordier, A
Cotti, U
Coutu, S
Covault, CE
Cronin, J
Dagoret-Campagne, S
Quang, TD
Darriulat, P
Daumiller, K
Dawson, BR
de Almeida, RM
de Carvalho, LA
De Donato, C
de Jong, SJ
de Mello, WJM
Neto, JRTD
De Mitri, I
de Oliveira, MAL
de Souza, V
del Peral, L
Deligny, O
Della Selva, A
Delle Fratte, C
Dembinski, H
Di Giulio, C
Diaz, JC
Dobrigkeit, C
D'Olivo, JC
Dornic, D
Dorofeev, A
Dova, MT
D'Urso, D
DuVernois, MA
Engel, R
Epele, L
Erdmann, M
Escobar, CO
Etchegoyen, A
Ewers, A
San Luis, PF
Falcke, H
Fauth, AC
Fazio, D
Fazzini, N
Fernandez, A
Ferrer, F
Ferry, S
Fick, B
Filevich, A
Filipcic, A
Fleck, I
Fokitis, E
Fonte, R
Fuhrmann, D
Fulgione, W
Garcia, B
Garcia-Pinto, D
Garrard, L
Garrido, X
Geenen, H
Gelmini, G
Gemmeke, H
Geranios, A
Ghia, PL
Giller, M
Gitto, J
Glass, H
Gobbi, F
Gold, MS
Albarracin, FG
Berisso, MG
Herrero, RG
do Amaral, MG
Gongora, JP
Gonzalez, D
Gonzalez, JG
Gonzalez, M
Gora, D
Gorgi, A
Gouffon, P
Grassi, V
Grillo, A
Grunfeld, C
Grupen, C
Guarino, F
Guedes, GP
Gutierrez, J
Hague, JD
Hamilton, JC
Harakeh, MN
Harari, D
Harmsma, S
Hartmann, S
Harton, JL
Healy, MD
Hebbeker, T
Heck, D
Hojvat, C
Homola, P
Horandel, J
Horneffer, A
Horvat, M
Hrabovsky, M
Iarlori, M
Insolia, A
Kaducak, M
Kalashev, O
Kampert, KH
Keilhauer, B
Kemp, E
Klages, HO
Kleifges, M
Kleinfeller, J
Knapik, R
Knapp, J
Koang, DH
Kolotaev, Y
Kopmann, A
Kromer, O
Kuhlman, S
Kuijpers, J
Kunka, N
Kusenko, A
Lachaud, C
Lago, BL
Lebrun, D
LeBrun, P
Lee, J
Letessier-Selvon, A
Leuthold, M
Lhenry-Yvon, I
Longo, G
Lopez, R
Agura, AL
Lucero, A
Maldera, S
Malek, M
Maltezos, S
Mancarella, G
Mancenido, ME
Mandat, D
Mantsch, P
Mariazzi, AG
Maris, IC
Martello, D
Martinez, N
Martinez, J
Martinez, O
Mathes, HJ
Matthews, J
Matthews, JAJ
Matthiae, G
Maurin, G
Maurizio, D
Mazur, PO
McCauley, T
McEwen, M
McNeil, RR
Medina, G
Medina, MC
Tanco, GM
Meli, A
Melo, D
Menichetti, E
Menshikov, A
Meurer, C
Meyhandan, R
Micheletti, MI
Miele, G
Miller, W
Mollerach, S
Monasor, M
Ragaigne, DM
Montanet, F
Morales, B
Morello, C
Moreno, E
Morris, C
Mostafa, M
Muller, MA
Mussa, R
Navarra, G
Nellen, L
Newman-Holmes, C
Newton, D
Thi, TN
Nichol, R
Nierstenhofer, N
Nitz, D
Nogima, H
Nosek, D
Nozka, L
Oehlschlager, J
Ohnuki, T
Olinto, A
Oliveira, LFA
Olmos-Gilbaja, VM
Ortiz, M
Ostapchenko, S
Otero, L
Palatka, M
Pallotta, J
Parente, G
Parizot, E
Parlati, S
Patel, M
Paul, T
Payet, K
Pech, M
Pekala, J
Pelayo, R
Pepe, IM
Perrone, L
Petrera, S
Petrinca, P
Petrov, Y
Ngoc, DP
Thi, TNP
Piegaia, R
Pierog, T
Pisanti, O
Porter, TA
Pouryamout, J
Prado, L
Privitera, P
Prouza, M
Quel, EJ
Rautenberg, J
Reis, HC
Reucroft, S
Revenu, B
Ridky, J
Risi, A
Risse, M
Riviere, C
Rizi, V
Robbins, S
Roberts, M
Robledo, C
Rodriguez, G
Frias, DR
Martino, JR
Rojo, JR
Ros, G
Roulet, E
Rovero, AC
Rosado, J
Roth, M
Roucelle, C
Rouille-d'Orfeuil, B
Roulet, E
Rovero, AC
Salamida, F
Salazar, H
Salina, G
Sanchez, F
Santander, M
Santos, EM
Sarkar, S
Sato, R
Scherini, V
Schmidt, T
Scholten, O
Schovanek, P
Schussler, F
Sciutto, SJ
Scuderi, M
Semikoz, D
Sequeiros, G
Shellard, RC
Siffert, BB
Sigl, G
Skelton, P
Slater, W
De Grande, NS
Smialkowski, A
Smida, R
Smith, BE
Snow, GR
Sokolsky, P
Sommers, P
Sorokin, J
Spinka, H
Strazzeri, E
Stutz, A
Suarez, F
Suomijarvi, T
Supanitsky, AD
Swain, J
Szadkowski, Z
Tamashiro, A
Tamburro, A
Tascau, O
Ticona, R
Timmermans, C
Tkaczyk, W
Peixoto, CJT
Tonachini, A
Torresi, D
Travnicek, P
Tripathi, A
Tristram, G
Tscherniakhovski, D
Tueros, M
Tunnicliffe, V
Ulrich, R
Unger, M
Urban, M
Galicia, JFV
Valino, I
Valore, L
van den Berg, AM
van Elewyck, V
Vazquez, RA
Veberic, D
Veiga, A
Velarde, A
Venters, T
Verzi, V
Videla, M
Villasenor, L
Van, TV
Vorobiov, S
Voyvodic, L
Wahlberg, H
Wainberg, O
Waldenmaier, T
Walker, P
Warner, D
Watson, AA
Westerhoff, S
Wiebusch, C
Wieczorek, G
Wiencke, L
Wilczynska, B
Wilczynski, H
Wileman, C
Winnick, MG
Xu, J
Yamamoto, T
Younk, P
Zas, E
Zavrtanik, D
Zavrtanik, M
Zech, A
Zepeda, A
Zha, M
Ziolkowski, M
Abstract: An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10(19) eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by observing the fluorescence light profile of air showers. This upper limit confirms and improves on previous results from the Haverah Park and AGASA surface arrays. Additional data recorded with the Auger surface detectors for a subset of the event sample support the conclusion that a photon origin of the observed events is not favored. (c) 2006 Elsevier B.V. All rights reserved.
Subject: cosmic rays
ultra-high energy photons
extensive air showers
Pierre Auger Observatory
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.astropartphys.2006.10.004
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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