Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest-energies, which are correlated with the positions of relatively nearby active galactic nuclei (AGN) [Pierre Auger Collaboration, Science 318 (2007) 938]. The correlation has maximum significance for cosmic rays with energy greater than $6 Â 1019 eV and AGN at a distance less than $75 Mpc. We have confirmed the anisotropy at a confidence level of more than 99% through a test with parameters specified a priori, using an independent data set. The observed correlation is compatible with the hypothesis that cosmic rays with the highest-energies originate from extra-galactic sources close enough so that their flux is not significantly attenuated by interaction with the cosmic background radiation (the Greisen–Zatsepin–Kuz’min effect). The angular scale of the correlation observed is a few degrees, which suggests a predominantly light composition unless the magnetic fields are very weak outside the thin disk of our galaxy. Our pres- ent data do not identify AGN as the sources of cosmic rays unambiguously, and other candidate sources which are distributed as nearby AGN are not ruled out. We discuss the prospect of unequivocal identification of individual sources of the highest-energy cosmic rays within a few years of continued operation of the Pierre Auger Observatory.

Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei / J. Abraham , P. Abreu, M. Aglietta, C. Aguirre , D. Allard, I. Allekotte, J. Allen, P. Allison, J. Alvarez-Muniz, M. Ambrosio, L. Anchordoqui, S. Andringa, A. Anzalone, C. Aramo, S. Argiro, K. Arisaka, E. Armengaud, F. Arneodo, F. Arqueros, T. Asch, H. Asorey, P. Assis, B.S. Atulugama, J. Aublin, M. Ave, G. Avila, T. Backer, D. Badagnani, A.F. Barbosa, D. Barnhill, S.L.C. Barroso, P. Bauleo, J.J. Beatty, T. Beau, B.R. Becker, K.H. Becker, J.A. Bellido, S. BenZvi, C. Berat, T. Bergmann, P. Bernardini, X. Bertou, P.L. Biermann, P. Billoir, O. Blanch-Bigas, F. Blanco, P. Blasi, C. Bleve, H. Blumer, M. Bohacova, C. Bonifazi, R. Bonino, J. Brack, P. Brogueira, W.C. Brown, P. Buchholz, A. Bueno, R.E. Burton, N.G. Busca, K.S. Caballero-Mora, B. Cai, D.V. Camin, L. Caramete, R. Caruso, W. Carvalho, A. Castellina, O. Catalano, G. Cataldi, L. Cazon, R. Cester, J. Chauvin, A. Chiavassa, J.A. Chinellato, A. Chou, J. Chye, R.W. Clay, E. Colombo, R. Conceicao, B. Connolly, F. Contreras, J. Coppens, A. Cordier, U. Cotti, S. Coutu, C.E. Covault, A. Creusot, A. Criss, J. Cronin, A. Curutiu, S. Dagoret-Campagne, K. Daumiller, B.R. Dawson, R.M. de Almeida, C. De Donato, S.J. de Jong, G. De La Vega, W.J.M. de Mello Junior, J.R.T. de Mello Neto, I. De Mitri, V. de Souza, L. del Peral, O. Deligny, A. Della Selva, C. Delle Fratte, H. Dembinski, C. Di Giulio, J.C. Diaz, P.N. Diep, C. Dobrigkeit, J.C. D’Olivo, P.N. Dong, D. Dornic, A. Dorofeev, J.C. dos Anjos, M.T. Dova, D. D’Urso, I. Dutan, M.A. DuVernois, R. Engel, L. Epele, M. Erdmann, C.O. Escobar, A. Etchegoyen, P. Facal San Luis, H. Falcke, G. Farrar, A.C. Fauth, N. Fazzini, F. Ferrer, S. Ferry, B. Fick, A. Filevich, A. Filipcic, I. Fleck, C.E. Fracchiolla, W. Fulgione, B. Garcıa, D. Garcıa Gamez, D. Garcia-Pinto, X. Garrido, H. Geenen, G. Gelmini, H. Gemmeke, P.L. Ghia, M. Giller, H. Glass, M.S. Gold, G. Golup, F. Gomez Albarracin, M. Gomez Berisso, R. Gomez Herrero, P. Goncalves, M. Goncalves do Amaral, D. Gonzalez, J.G. Gonzalez, M. Gonzalez, D. Gora, A. Gorgi, P. Gouffon, V. Grassi, A.F. Grillo, C. Grunfeld, Y. Guardincerri, F. Guarino, G.P. Guedes, J. Gutierrez, J.D. Hague, J.C. Hamilton, P. Hansen, D. Harari, S. Harmsma, J.L. Harton, A. Haungs, T. Hauschildt, M.D. Healy, T. Hebbeker, G. Hebrero, D. Heck, C. Hojvat, V.C. Holmes, P. Homola, J. Horandel, A. Horneffer, M. Horvat, M. Hrabovsky, T. Huege, M. Hussain, M. Iarlori, A. Insolia, F. Ionita, A. Italiano, M. Kaducak, K.H. Kampert, T. Karova, B. Kegl, B. Keilhauer, E. Kemp, R.M. Kieckhafer, H.O. Klages, M. Kleifges, J. Kleinfeller, R. Knapik, J. Knapp, D.-H. Koang, A. Krieger, O. Kromer, D. Kuempel, N. Kunka, A. Kusenko, G. La Rosa, C. Lachaud, B.L. Lago, D. Lebrun, P. LeBrun, J. Lee, M.A. Leigui de Oliveira, A. Letessier-Selvon, M. Leuthold, I. Lhenry-Yvon, R. Lopez, A. Lopez Aguera, J. Lozano Bahilo , R. Luna Garcıa , M.C. Maccarone , C. Macolino, S. Maldera, G. Mancarella, M.E. Mancenido, D. Mandat, P. Mantsch, A.G. Mariazzi, I.C. Maris, H.R. Marquez Falcon, D. Martello, J. Martınez, O. Martınez Bravo, H.J. Mathes, J. Matthews, J.A.J. Matthews, G. Matthiae, D. Maurizio, P.O. Mazur, T. McCauley, M. McEwen, R.R. McNeil, M.C. Medina, G. Medina-Tanco, A. Meli, D. Melo, E. Menichetti, A. Menschikov, Chr. Meurer, R. Meyhandan, M.I. Micheletti, G. Miele, W. Miller, S. Mollerach, M. Monasor, D. Monnier Ragaigne, F. Montanet, B. Morales, C. Morello, J.C. Moreno, C. Morris, M. Mostafa, M.A. Muller, R. Mussa, G. Navarra, J.L. Navarro, S. Navas, P. Necesal, L. Nellen, C. Newman-Holmes, D. Newton, P.T. Nhung, N. Nierstenhoefer, D. Nitz, D. Nosek, L. Nozka, J. Oehlschlager,T. Ohnuki, A. Olinto, V.M. Olmos-Gilbaja, M. Ortiz, F. Ortolani, S. Ostapchenko, L. Otero, N. Pacheco, D. Pakk Selmi-Dei, M. Palatka, J. Pallotta, G. Parente, E. Parizot, S. Parlati, S. Pastor, M. Patel, T. Paul, V. Pavlidou, K. Payet, M. Pech, J. Pekala, R. Pelayo, I.M. Pepe, L. Perrone, S. Petrera, P. Petrinca, Y. Petrov, A. Pichel, R. Piegaia, T. Pierog, M. Pimenta, T. Pinto, V. Pirronello, O. Pisanti, M. Platino, J. Pochon, P. Privitera, M. Prouza, E.J. Quel, J. Rautenberg, A. Redondo, S. Reucroft, B. Revenu, F.A.S. Rezende, J. Ridky, S. Riggi, M. Risse, C. Riviere, V. Rizi, M. Roberts, C. Robledo, G. Rodriguez, J. Rodriguez Martino, J. Rodriguez Rojo, I. Rodriguez-Cabo, M.D. Rodrıguez-Frıas, G. Ros, J. Rosado, M. Roth, B. Rouille-d’Orfeuil, E. Roulet, A.C. Rovero, F. Salamida, H. Salazar, G. Salina, F. Sanchez, M. Santander, C.E. Santo, E.M. Santos, F. Sarazin, S. Sarkar, R. Sato, V. Scherini, H. Schieler, A. Schmidt, F. Schmidt, T. Schmidt, O. Scholten, P. Schovanek, F. Schussler, S.J. Sciutto, M. Scuderi, A. Segreto, D. Semikoz, M. Settimo, R.C. Shellard, I. Sidelnik, B.B. Siffert, G. Sigl, N. Smetniansky De Grande, A. Smiałkowski, R. Smıda, A.G.K. Smith, B.E. Smith, G.R. Snow , P. Sokolsky , P. Sommers, J. Sorokin, H. Spinka, R. Squartini, E. Strazzeri, A. Stutz, F. Suarez, T. Suomijarvi, A.D. Supanitsky, M.S. Sutherland, J. Swain, Z. Szadkowski, J. Takahashi, A. Tamashiro, A. Tamburro, O. Tascau, R. Tcaciuc, N.T. Thao, D. Thomas, R. Ticona, J. Tiffenberg, C. Timmermans, W. Tkaczyk, C.J. Todero Peixoto, B. Tome, A. Tonachini, I. Torres, P. Travnicek, A. Tripathi, G. Tristram, D. Tscherniakhovski, M. Tueros, R. Ulrich, M. Unger, M. Urban, J.F. Valdes Galicia, I. Valino, L. Valore, A.M. van den Berg, V. van Elewyck, R.A. Vazquez, D. Veberic, A. Veiga, A. Velarde, T. Venters, V. Verzi, M. Videla, L. Villasenor, S. Vorobiov, L. Voyvodic, H. Wahlberg, O. Wainberg, D. Warner, A.A. Watson, S. Westerhoff, G. Wieczorek, L. Wiencke, B. Wilczynska, H. Wilczynski, C. Wileman, M.G. Winnick, H. Wu, B. Wundheiler, T. Yamamoto, P. Younk, E. Zas, D. Zavrtanik, M. Zavrtanik, A. Zech, A. Zepeda, M. Ziolkowski. - In: ASTROPARTICLE PHYSICS. - ISSN 0927-6505. - 29:3(2008 Apr), pp. 188-204.

Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei

D.V. Camin;V. Grassi;V. Scherini;
2008-04

Abstract

Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest-energies, which are correlated with the positions of relatively nearby active galactic nuclei (AGN) [Pierre Auger Collaboration, Science 318 (2007) 938]. The correlation has maximum significance for cosmic rays with energy greater than $6 Â 1019 eV and AGN at a distance less than $75 Mpc. We have confirmed the anisotropy at a confidence level of more than 99% through a test with parameters specified a priori, using an independent data set. The observed correlation is compatible with the hypothesis that cosmic rays with the highest-energies originate from extra-galactic sources close enough so that their flux is not significantly attenuated by interaction with the cosmic background radiation (the Greisen–Zatsepin–Kuz’min effect). The angular scale of the correlation observed is a few degrees, which suggests a predominantly light composition unless the magnetic fields are very weak outside the thin disk of our galaxy. Our pres- ent data do not identify AGN as the sources of cosmic rays unambiguously, and other candidate sources which are distributed as nearby AGN are not ruled out. We discuss the prospect of unequivocal identification of individual sources of the highest-energy cosmic rays within a few years of continued operation of the Pierre Auger Observatory.
AGN; Anisotropy; Auger; EGMF; Extra-galactic; GMF; GZK; High energy cosmic rays; Observatory; UHECR
Settore FIS/01 - Fisica Sperimentale
ASTROPARTICLE PHYSICS
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/139997
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