An upper limit to the photon fraction in cosmic rays above 10(19) eV from the Pierre Auger Observatory

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

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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
Citation:	Astroparticle Physics. Elsevier Science Bv, v. 27, n. 41700, n. 155, n. 168, 2007.
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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