A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory

P. Abreu, M. Aglietta, M. Ahlers, E. J. Ahn, I. F M Albuquerque, D. Allard, I. Allekotte, J. Allen, P. Allison, A. Almela, J. Alvarez Castillo, J. Alvarez-Mũiz, M. Ambrosio, A. Aminaei, L. Anchordoqui, S. Andringa, T. Antici'C, C. Aramo, E. Arganda, F. ArquerosH. Asorey, P. Assis, J. Aublin, M. Ave, M. Avenier, G. Avila, T. Bäcker, A. M. Badescu, M. Balzer, K. B. Barber, A. F. Barbosa, R. Bardenet, S. L C Barroso, B. Baughman, J. Bäuml, J. J. Beatty, B. R. Becker, K. H. Becker, A. Bellétoile, J. A. Bellido, S. Benzvi, C. Berat, X. Bertou, P. L. Biermann, P. Billoir, F. Blanco, M. Blanco, C. Bleve, H. Blümer, M. Boháčová, D. Boncioli, C. Bonifazi, R. Bonino, N. Borodai, J. Brack, I. Brancus, P. Brogueira, W. C. Brown, R. Bruijn, P. Buchholz, A. Bueno, R. E. Burton, K. S. Caballero-Mora, B. Caccianiga, L. Caramete, R. Caruso, A. Castellina, O. Catalano, G. Cataldi, L. Cazon, R. Cester, J. Chauvin, S. H. Cheng, A. Chiavassa, J. A. Chinellato, J. Chirinos Diaz, J. Chudoba, M. Cilmo, R. W. Clay, M. R. Coluccia, R. Conceiço, F. Contreras, H. Cook, M. J. Cooper, J. Coppens, A. Cordier, S. Coutu, C. E. Covault, A. Creusot, A. Criss, J. Cronin, A. Curutiu, S. Dagoret-Campagne, R. Dallier, S. Dasso, K. Daumiller, B. R. Dawson, R. M. De Almeida, M. De Domenico, 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, K. D. De Vries, L. Del Peral, M. Del Río, O. Deligny, H. Dembinski, N. Dhital, C. Di Giulio, M. L. Díaz Castro, P. N. Diep, F. Diogo, C. Dobrigkeit, W. Docters, J. C. D'Olivo, P. N. Dong, A. Dorofeev, J. C. Dos Anjos, M. T. Dova, D. D'Urso, I. Dutan, J. Ebr, R. Engel, M. Erdmann, C. O. Escobar, J. Espadanal, A. Etchegoyen, P. Facal San Luis, I. Fajardo Tapia, H. Falcke, G. Farrar, A. C. Fauth, N. Fazzini, A. P. Ferguson, B. Fick, A. Filevich, A. Filipčič, S. Fliescher, C. E. Fracchiolla, E. D. Fraenkel, O. Fratu, U. Fröhlich, B. Fuchs, R. Gaior, R. F. Gamarra, S. Gambetta, B. García, S. T. Garcia Roca, D. Garcia-Gamez, D. Garcia-Pinto, A. Gascon, H. Gemmeke, P. L. Ghia, U. Giaccari, M. Giller, H. Glass, M. S. Gold, G. Golup, F. Gomez Albarracin, M. Gómez Berisso, P. F. Gómez Vitale, P. Gonçalves, D. Gonzalez, J. G. Gonzalez, B. Gookin, A. Gorgi, P. Gouffon, E. Grashorn, S. Grebe, N. Griffith, M. Grigat, A. F. Grillo, Y. Guardincerri, F. Guarino, G. P. Guedes, A. Guzman, J. D. Hague, P. Hansen, D. Harari, S. Harmsma, T. A. Harrison, J. L. Harton, A. Haungs, T. Hebbeker, D. Heck, A. E. Herve, C. Hojvat, N. Hollon, V. C. Holmes, P. Homola, J. R. Hörandel, A. Horneffer, P. Horvath, M. Hrabovský, T. Huege, A. Insolia, F. Ionita, A. Italiano, C. Jarne, S. Jiraskova, M. Josebachuili, K. Kadija, K. H. Kampert, P. Karhan, P. Kasper, B. Kégl, B. Keilhauer, A. Keivani, J. L. Kelley, E. Kemp, R. M. Kieckhafer, H. O. Klages, M. Kleifges, J. Kleinfeller, J. Knapp, D. H. Koang, K. Kotera, N. Krohm, O. Krömer, D. Kruppke-Hansen, F. Kuehn, D. Kuempel, J. K. Kulbartz, N. Kunka, G. La Rosa, C. Lachaud, R. Lauer, P. Lautridou, S. Le Coz, M. S A B Leão, D. Lebrun, P. Lebrun, M. A. Leigui De Oliveira, A. Letessier-Selvon, I. Lhenry-Yvon, K. Link, R. López, A. Lopez Agüera, K. Louedec, J. Lozano Bahilo, L. Lu, A. Lucero, M. Ludwig, H. Lyberis, C. MacOlino, S. Maldera, D. Mandat, P. Mantsch, A. G. Mariazzi, J. Marin, V. Marin, I. C. Maris, H. R. Marquez Falcon, G. Marsella, D. Martello, L. Martin, H. Martinez, O. Martínez Bravo, H. J. Mathes, J. Matthews, J. A J Matthews, G. Matthiae, D. Maurel, D. Maurizio, P. O. Mazur, G. Medina-Tanco, M. Melissas, D. Melo, E. Menichetti, A. Menshikov, P. Mertsch, C. Meurer, S. Mi'Canovi'C, M. I. Micheletti, I. A. Minaya, L. Miramonti, L. Molina-Bueno, S. Mollerach, M. Monasor, D. Monnier Ragaigne, F. Montanet, B. Morales, C. Morello, E. Moreno, J. C. Moreno, M. Mostafá, C. A. Moura, M. A. Muller, G. Müller, M. Münchmeyer, R. Mussa, G. Navarra, J. L. Navarro, S. Navas, P. Necesal, L. Nellen, A. Nelles, J. Neuser, P. T. Nhung, M. Niechciol, L. Niemietz, N. Nierstenhoefer, D. Nitz, D. Nosek, L. Nožka, M. Nyklicek, J. Oehlschläger, A. Olinto, M. Ortiz, N. Pacheco, D. Pakk Selmi-Dei, M. Palatka, J. Pallotta, N. Palmieri, G. Parente, E. Parizot, A. Parra, S. Pastor, T. Paul, M. Pech, J. Pekala, R. Pelayo, I. M. Pepe, L. Perrone, R. Pesce, E. Petermann, S. Petrera, P. Petrinca, A. Petrolini, Y. Petrov, J. Petrovic, C. Pfendner, R. Piegaia, T. Pierog, P. Pieroni, M. Pimenta, V. Pirronello, M. Platino, V. H. Ponce, M. Pontz, A. Porcelli, P. Privitera, M. Prouza, E. J. Quel, S. Querchfeld, J. Rautenberg, O. Ravel, D. Ravignani, B. Revenu, J. Ridky, S. Riggi, M. Risse, P. Ristori, H. Rivera, V. Rizi, J. Roberts, W. Rodrigues De Carvalho, G. Rodriguez, J. Rodriguez Martino, J. Rodriguez Rojo, I. Rodriguez-Cabo, M. D. Rodríguez-Frías, G. Ros, J. Rosado, T. Rossler, M. Roth, B. Rouillé-D'Orfeuil, E. Roulet, A. C. Rovero, C. Rühle, A. Saftoiu, F. Salamida, H. Salazar, F. Salesa Greus, G. Salina, F. Snchez, C. E. Santo, E. Santos, E. M. Santos, F. Sarazin, B. Sarkar, S. Sarkar, R. Sato, N. Scharf, V. Scherini, H. Schieler, P. Schiffer, A. Schmidt, O. Scholten, H. Schoorlemmer, J. Schovancova, P. Schovnek, F. Schröder, S. Schulte, D. Schuster, S. J. Sciutto, M. Scuderi, A. Segreto, M. Settimo, A. Shadkam, R. C. Shellard, I. Sidelnik, G. Sigl, H. H. Silva Lopez, O. Sima, A. 'Smiakowski, R. Mída, G. R. Snow, P. Sommers, J. Sorokin, H. Spinka, R. Squartini, Y. N. Srivastava, S. Stanic, J. Stapleton, J. Stasielak, M. Stephan, A. Stutz, F. Suarez, T. Suomijärvi, A. D. Supanitsky, T. Šuša, M. S. Sutherland, J. Swain, Z. Szadkowski, M. Szuba, A. Tapia, M. Tartare, O. Tacu, C. G. Tavera Ruiz, R. Tcaciuc, D. Tegolo, N. T. Thao, D. Thomas, J. Tiffenberg, C. Timmermans, W. Tkaczyk, C. J. Todero Peixoto, G. Toma, B. Tomé, A. Tonachini, P. Travnicek, D. B. Tridapalli, G. Tristram, E. Trovato, M. Tueros, R. Ulrich, M. Unger, M. Urban, J. F. Valdés Galicia, I. Valĩo, L. Valore, A. M. Van Den Berg, E. Varela, B. Vargas Cárdenas, J. R. Vázquez, R. A. Vázquez, D. Veberič, V. Verzi, J. Vicha, M. Videla, L. Villasẽor, H. Wahlberg, P. Wahrlich, O. Wainberg, D. Walz, A. A. Watson, M. Weber, K. Weidenhaupt, A. Weindl, F. Werner, S. Westerhoff, B. j. Whelan, A. Widom, G. Wieczorek, L. Wiencke, B. Wilczyska, H. Wilczyski, M. Will, C. Williams, T. Winchen, M. Wommer, B. Wundheiler, T. Yamamoto, T. Yapici, P. Younk, G. Yuan, A. Yushkov, B. Zamorano, E. Zas, D. Zavrtanik, M. Zavrtanik, Ingyin Zaw, A. Zepeda, Y. Zhu, M. Zimbres Silva, M. Ziolkowski

Research output: Contribution to journalArticle

Abstract

Observations of cosmic ray arrival directions made with the Pierre Auger Observatory have previously provided evidence of anisotropy at the 99% CL using the correlation of ultra high energy cosmic rays (UHECRs) with objects drawn from the Véron-Cetty Véron catalog. In this paper we report on the use of three catalog independent methods to search for anisotropy. The 2pt-L, 2pt+ and 3pt methods, each giving a different measure of self-clustering in arrival directions, were tested on mock cosmic ray data sets to study the impacts of sample size and magnetic smearing on their results, accounting for both angular and energy resolutions. If the sources of UHECRs follow the same large scale structure as ordinary galaxies in the local Universe and if UHECRs are deflected no more than a few degrees, a study of mock maps suggests that these three methods can efficiently respond to the resulting anisotropy with a P-value = 1.0% or smaller with data sets as few as 100 events. Using data taken from January 1, 2004 to July 31, 2010 we examined the 20,30,110 highest energy events with a corresponding minimum energy threshold of about 49.3 EeV. The minimum P-values found were 13.5% using the 2pt-L method, 1.0% using the 2pt+ method and 1.1% using the 3pt method for the highest 100 energy events. In view of the multiple (correlated) scans performed on the data set, these catalog-independent methods do not yield strong evidence of anisotropy in the highest energy cosmic rays.

Original languageEnglish (US)
Article number040
JournalJournal of Cosmology and Astroparticle Physics
Volume2012
Issue number4
DOIs
StatePublished - Apr 2012

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arrivals
cosmic rays
observatories
anisotropy
catalogs
energy
angular resolution
universe
galaxies
thresholds

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory. / Abreu, P.; Aglietta, M.; Ahlers, M.; Ahn, E. J.; Albuquerque, I. F M; Allard, D.; Allekotte, I.; Allen, J.; Allison, P.; Almela, A.; Alvarez Castillo, J.; Alvarez-Mũiz, J.; Ambrosio, M.; Aminaei, A.; Anchordoqui, L.; Andringa, S.; Antici'C, T.; Aramo, C.; Arganda, E.; Arqueros, F.; Asorey, H.; Assis, P.; Aublin, J.; Ave, M.; Avenier, M.; Avila, G.; Bäcker, T.; Badescu, A. M.; Balzer, M.; Barber, K. B.; Barbosa, A. F.; Bardenet, R.; Barroso, S. L C; Baughman, B.; Bäuml, J.; Beatty, J. J.; Becker, B. R.; Becker, K. H.; Bellétoile, A.; Bellido, J. A.; Benzvi, S.; Berat, C.; Bertou, X.; Biermann, P. L.; Billoir, P.; Blanco, F.; Blanco, M.; Bleve, C.; Blümer, H.; Boháčová, M.; Boncioli, D.; Bonifazi, C.; Bonino, R.; Borodai, N.; Brack, J.; Brancus, I.; Brogueira, P.; Brown, W. C.; Bruijn, R.; Buchholz, P.; Bueno, A.; Burton, R. E.; Caballero-Mora, K. S.; Caccianiga, B.; Caramete, L.; Caruso, R.; Castellina, A.; Catalano, O.; Cataldi, G.; Cazon, L.; Cester, R.; Chauvin, J.; Cheng, S. H.; Chiavassa, A.; Chinellato, J. A.; Chirinos Diaz, J.; Chudoba, J.; Cilmo, M.; Clay, R. W.; Coluccia, M. R.; Conceiço, R.; Contreras, F.; Cook, H.; Cooper, M. J.; Coppens, J.; Cordier, A.; Coutu, S.; Covault, C. E.; Creusot, A.; Criss, A.; Cronin, J.; Curutiu, A.; Dagoret-Campagne, S.; Dallier, R.; Dasso, S.; Daumiller, K.; Dawson, B. R.; De Almeida, R. M.; De Domenico, M.; De Donato, C.; De Jong, S. J.; De La Vega, G.; De Mello Junior, W. J M; De Mello Neto, J. R T; De Mitri, I.; De Souza, V.; De Vries, K. D.; Del Peral, L.; Del Río, M.; Deligny, O.; Dembinski, H.; Dhital, N.; Di Giulio, C.; Díaz Castro, M. L.; Diep, P. N.; Diogo, F.; Dobrigkeit, C.; Docters, W.; D'Olivo, J. C.; Dong, P. N.; Dorofeev, A.; Dos Anjos, J. C.; Dova, M. T.; D'Urso, D.; Dutan, I.; Ebr, J.; Engel, R.; Erdmann, M.; Escobar, C. O.; Espadanal, J.; Etchegoyen, A.; Facal San Luis, P.; Fajardo Tapia, I.; Falcke, H.; Farrar, G.; Fauth, A. C.; Fazzini, N.; Ferguson, A. P.; Fick, B.; Filevich, A.; Filipčič, A.; Fliescher, S.; Fracchiolla, C. E.; Fraenkel, E. D.; Fratu, O.; Fröhlich, U.; Fuchs, B.; Gaior, R.; Gamarra, R. F.; Gambetta, S.; García, B.; Garcia Roca, S. T.; Garcia-Gamez, D.; Garcia-Pinto, D.; Gascon, A.; Gemmeke, H.; Ghia, P. L.; Giaccari, U.; Giller, M.; Glass, H.; Gold, M. S.; Golup, G.; Gomez Albarracin, F.; Gómez Berisso, M.; Gómez Vitale, P. F.; Gonçalves, P.; Gonzalez, D.; Gonzalez, J. G.; Gookin, B.; Gorgi, A.; Gouffon, P.; Grashorn, E.; Grebe, S.; Griffith, N.; Grigat, M.; Grillo, A. F.; Guardincerri, Y.; Guarino, F.; Guedes, G. P.; Guzman, A.; Hague, J. D.; Hansen, P.; Harari, D.; Harmsma, S.; Harrison, T. A.; Harton, J. L.; Haungs, A.; Hebbeker, T.; Heck, D.; Herve, A. E.; Hojvat, C.; Hollon, N.; Holmes, V. C.; Homola, P.; Hörandel, J. R.; Horneffer, A.; Horvath, P.; Hrabovský, M.; Huege, T.; Insolia, A.; Ionita, F.; Italiano, A.; Jarne, C.; Jiraskova, S.; Josebachuili, M.; Kadija, K.; Kampert, K. H.; Karhan, P.; Kasper, P.; Kégl, B.; Keilhauer, B.; Keivani, A.; Kelley, J. L.; Kemp, E.; Kieckhafer, R. M.; Klages, H. O.; Kleifges, M.; Kleinfeller, J.; Knapp, J.; Koang, D. H.; Kotera, K.; Krohm, N.; Krömer, O.; Kruppke-Hansen, D.; Kuehn, F.; Kuempel, D.; Kulbartz, J. K.; Kunka, N.; La Rosa, G.; Lachaud, C.; Lauer, R.; Lautridou, P.; Le Coz, S.; Leão, M. S A B; Lebrun, D.; Lebrun, P.; Leigui De Oliveira, M. A.; Letessier-Selvon, A.; Lhenry-Yvon, I.; Link, K.; López, R.; Lopez Agüera, A.; Louedec, K.; Lozano Bahilo, J.; Lu, L.; Lucero, A.; Ludwig, M.; Lyberis, H.; MacOlino, C.; Maldera, S.; Mandat, D.; Mantsch, P.; Mariazzi, A. G.; Marin, J.; Marin, V.; Maris, I. C.; Marquez Falcon, H. R.; Marsella, G.; Martello, D.; Martin, L.; Martinez, H.; Martínez Bravo, O.; Mathes, H. J.; Matthews, J.; Matthews, J. A J; Matthiae, G.; Maurel, D.; Maurizio, D.; Mazur, P. O.; Medina-Tanco, G.; Melissas, M.; Melo, D.; Menichetti, E.; Menshikov, A.; Mertsch, P.; Meurer, C.; Mi'Canovi'C, S.; Micheletti, M. I.; Minaya, I. A.; Miramonti, L.; Molina-Bueno, L.; Mollerach, S.; Monasor, M.; Monnier Ragaigne, D.; Montanet, F.; Morales, B.; Morello, C.; Moreno, E.; Moreno, J. C.; Mostafá, M.; Moura, C. A.; Muller, M. A.; Müller, G.; Münchmeyer, M.; Mussa, R.; Navarra, G.; Navarro, J. L.; Navas, S.; Necesal, P.; Nellen, L.; Nelles, A.; Neuser, J.; Nhung, P. T.; Niechciol, M.; Niemietz, L.; Nierstenhoefer, N.; Nitz, D.; Nosek, D.; Nožka, L.; Nyklicek, M.; Oehlschläger, J.; Olinto, A.; Ortiz, M.; Pacheco, N.; Pakk Selmi-Dei, D.; Palatka, M.; Pallotta, J.; Palmieri, N.; Parente, G.; Parizot, E.; Parra, A.; Pastor, S.; Paul, T.; Pech, M.; Pekala, J.; Pelayo, R.; Pepe, I. M.; Perrone, L.; Pesce, R.; Petermann, E.; Petrera, S.; Petrinca, P.; Petrolini, A.; Petrov, Y.; Petrovic, J.; Pfendner, C.; Piegaia, R.; Pierog, T.; Pieroni, P.; Pimenta, M.; Pirronello, V.; Platino, M.; Ponce, V. H.; Pontz, M.; Porcelli, A.; Privitera, P.; Prouza, M.; Quel, E. J.; Querchfeld, S.; Rautenberg, J.; Ravel, O.; Ravignani, D.; Revenu, B.; Ridky, J.; Riggi, S.; Risse, M.; Ristori, P.; Rivera, H.; Rizi, V.; Roberts, J.; Rodrigues De Carvalho, W.; Rodriguez, G.; Rodriguez Martino, J.; Rodriguez Rojo, J.; Rodriguez-Cabo, I.; Rodríguez-Frías, M. D.; Ros, G.; Rosado, J.; Rossler, T.; Roth, M.; Rouillé-D'Orfeuil, B.; Roulet, E.; Rovero, A. C.; Rühle, C.; Saftoiu, A.; Salamida, F.; Salazar, H.; Salesa Greus, F.; Salina, G.; Snchez, F.; Santo, C. E.; Santos, E.; Santos, E. M.; Sarazin, F.; Sarkar, B.; Sarkar, S.; Sato, R.; Scharf, N.; Scherini, V.; Schieler, H.; Schiffer, P.; Schmidt, A.; Scholten, O.; Schoorlemmer, H.; Schovancova, J.; Schovnek, P.; Schröder, F.; Schulte, S.; Schuster, D.; Sciutto, S. J.; Scuderi, M.; Segreto, A.; Settimo, M.; Shadkam, A.; Shellard, R. C.; Sidelnik, I.; Sigl, G.; Silva Lopez, H. H.; Sima, O.; 'Smiakowski, A.; Mída, R.; Snow, G. R.; Sommers, P.; Sorokin, J.; Spinka, H.; Squartini, R.; Srivastava, Y. N.; Stanic, S.; Stapleton, J.; Stasielak, J.; Stephan, M.; Stutz, A.; Suarez, F.; Suomijärvi, T.; Supanitsky, A. D.; Šuša, T.; Sutherland, M. S.; Swain, J.; Szadkowski, Z.; Szuba, M.; Tapia, A.; Tartare, M.; Tacu, O.; Tavera Ruiz, C. G.; Tcaciuc, R.; Tegolo, D.; Thao, N. T.; Thomas, D.; Tiffenberg, J.; Timmermans, C.; Tkaczyk, W.; Todero Peixoto, C. J.; Toma, G.; Tomé, B.; Tonachini, A.; Travnicek, P.; Tridapalli, D. B.; Tristram, G.; Trovato, E.; Tueros, M.; Ulrich, R.; Unger, M.; Urban, M.; Valdés Galicia, J. F.; Valĩo, I.; Valore, L.; Van Den Berg, A. M.; Varela, E.; Vargas Cárdenas, B.; Vázquez, J. R.; Vázquez, R. A.; Veberič, D.; Verzi, V.; Vicha, J.; Videla, M.; Villasẽor, L.; Wahlberg, H.; Wahrlich, P.; Wainberg, O.; Walz, D.; Watson, A. A.; Weber, M.; Weidenhaupt, K.; Weindl, A.; Werner, F.; Westerhoff, S.; Whelan, B. j.; Widom, A.; Wieczorek, G.; Wiencke, L.; Wilczyska, B.; Wilczyski, H.; Will, M.; Williams, C.; Winchen, T.; Wommer, M.; Wundheiler, B.; Yamamoto, T.; Yapici, T.; Younk, P.; Yuan, G.; Yushkov, A.; Zamorano, B.; Zas, E.; Zavrtanik, D.; Zavrtanik, M.; Zaw, Ingyin; Zepeda, A.; Zhu, Y.; Zimbres Silva, M.; Ziolkowski, M.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2012, No. 4, 040, 04.2012.

Research output: Contribution to journalArticle

Abreu, P, Aglietta, M, Ahlers, M, Ahn, EJ, Albuquerque, IFM, Allard, D, Allekotte, I, Allen, J, Allison, P, Almela, A, Alvarez Castillo, J, Alvarez-Mũiz, J, Ambrosio, M, Aminaei, A, Anchordoqui, L, Andringa, S, Antici'C, T, Aramo, C, Arganda, E, Arqueros, F, Asorey, H, Assis, P, Aublin, J, Ave, M, Avenier, M, Avila, G, Bäcker, T, Badescu, AM, Balzer, M, Barber, KB, Barbosa, AF, Bardenet, R, Barroso, SLC, Baughman, B, Bäuml, J, Beatty, JJ, Becker, BR, Becker, KH, Bellétoile, A, Bellido, JA, Benzvi, S, Berat, C, Bertou, X, Biermann, PL, Billoir, P, Blanco, F, Blanco, M, Bleve, C, Blümer, H, Boháčová, M, Boncioli, D, Bonifazi, C, Bonino, R, Borodai, N, Brack, J, Brancus, I, Brogueira, P, Brown, WC, Bruijn, R, Buchholz, P, Bueno, A, Burton, RE, Caballero-Mora, KS, Caccianiga, B, Caramete, L, Caruso, R, Castellina, A, Catalano, O, Cataldi, G, Cazon, L, Cester, R, Chauvin, J, Cheng, SH, Chiavassa, A, Chinellato, JA, Chirinos Diaz, J, Chudoba, J, Cilmo, M, Clay, RW, Coluccia, MR, Conceiço, R, Contreras, F, Cook, H, Cooper, MJ, Coppens, J, Cordier, A, Coutu, S, Covault, CE, Creusot, A, Criss, A, Cronin, J, Curutiu, A, Dagoret-Campagne, S, Dallier, R, Dasso, S, Daumiller, K, Dawson, BR, De Almeida, RM, De Domenico, M, De Donato, C, De Jong, SJ, De La Vega, G, De Mello Junior, WJM, De Mello Neto, JRT, De Mitri, I, De Souza, V, De Vries, KD, Del Peral, L, Del Río, M, Deligny, O, Dembinski, H, Dhital, N, Di Giulio, C, Díaz Castro, ML, Diep, PN, Diogo, F, Dobrigkeit, C, Docters, W, D'Olivo, JC, Dong, PN, Dorofeev, A, Dos Anjos, JC, Dova, MT, D'Urso, D, Dutan, I, Ebr, J, Engel, R, Erdmann, M, Escobar, CO, Espadanal, J, Etchegoyen, A, Facal San Luis, P, Fajardo Tapia, I, Falcke, H, Farrar, G, Fauth, AC, Fazzini, N, Ferguson, AP, Fick, B, Filevich, A, Filipčič, A, Fliescher, S, Fracchiolla, CE, Fraenkel, ED, Fratu, O, Fröhlich, U, Fuchs, B, Gaior, R, Gamarra, RF, Gambetta, S, García, B, Garcia Roca, ST, Garcia-Gamez, D, Garcia-Pinto, D, Gascon, A, Gemmeke, H, Ghia, PL, Giaccari, U, Giller, M, Glass, H, Gold, MS, Golup, G, Gomez Albarracin, F, Gómez Berisso, M, Gómez Vitale, PF, Gonçalves, P, Gonzalez, D, Gonzalez, JG, Gookin, B, Gorgi, A, Gouffon, P, Grashorn, E, Grebe, S, Griffith, N, Grigat, M, Grillo, AF, Guardincerri, Y, Guarino, F, Guedes, GP, Guzman, A, Hague, JD, Hansen, P, Harari, D, Harmsma, S, Harrison, TA, Harton, JL, Haungs, A, Hebbeker, T, Heck, D, Herve, AE, Hojvat, C, Hollon, N, Holmes, VC, Homola, P, Hörandel, JR, Horneffer, A, Horvath, P, Hrabovský, M, Huege, T, Insolia, A, Ionita, F, Italiano, A, Jarne, C, Jiraskova, S, Josebachuili, M, Kadija, K, Kampert, KH, Karhan, P, Kasper, P, Kégl, B, Keilhauer, B, Keivani, A, Kelley, JL, Kemp, E, Kieckhafer, RM, Klages, HO, Kleifges, M, Kleinfeller, J, Knapp, J, Koang, DH, Kotera, K, Krohm, N, Krömer, O, Kruppke-Hansen, D, Kuehn, F, Kuempel, D, Kulbartz, JK, Kunka, N, La Rosa, G, Lachaud, C, Lauer, R, Lautridou, P, Le Coz, S, Leão, MSAB, Lebrun, D, Lebrun, P, Leigui De Oliveira, MA, Letessier-Selvon, A, Lhenry-Yvon, I, Link, K, López, R, Lopez Agüera, A, Louedec, K, Lozano Bahilo, J, Lu, L, Lucero, A, Ludwig, M, Lyberis, H, MacOlino, C, Maldera, S, Mandat, D, Mantsch, P, Mariazzi, AG, Marin, J, Marin, V, Maris, IC, Marquez Falcon, HR, Marsella, G, Martello, D, Martin, L, Martinez, H, Martínez Bravo, O, Mathes, HJ, Matthews, J, Matthews, JAJ, Matthiae, G, Maurel, D, Maurizio, D, Mazur, PO, Medina-Tanco, G, Melissas, M, Melo, D, Menichetti, E, Menshikov, A, Mertsch, P, Meurer, C, Mi'Canovi'C, S, Micheletti, MI, Minaya, IA, Miramonti, L, Molina-Bueno, L, Mollerach, S, Monasor, M, Monnier Ragaigne, D, Montanet, F, Morales, B, Morello, C, Moreno, E, Moreno, JC, Mostafá, M, Moura, CA, Muller, MA, Müller, G, Münchmeyer, M, Mussa, R, Navarra, G, Navarro, JL, Navas, S, Necesal, P, Nellen, L, Nelles, A, Neuser, J, Nhung, PT, Niechciol, M, Niemietz, L, Nierstenhoefer, N, Nitz, D, Nosek, D, Nožka, L, Nyklicek, M, Oehlschläger, J, Olinto, A, Ortiz, M, Pacheco, N, Pakk Selmi-Dei, D, Palatka, M, Pallotta, J, Palmieri, N, Parente, G, Parizot, E, Parra, A, Pastor, S, Paul, T, Pech, M, Pekala, J, Pelayo, R, Pepe, IM, Perrone, L, Pesce, R, Petermann, E, Petrera, S, Petrinca, P, Petrolini, A, Petrov, Y, Petrovic, J, Pfendner, C, Piegaia, R, Pierog, T, Pieroni, P, Pimenta, M, Pirronello, V, Platino, M, Ponce, VH, Pontz, M, Porcelli, A, Privitera, P, Prouza, M, Quel, EJ, Querchfeld, S, Rautenberg, J, Ravel, O, Ravignani, D, Revenu, B, Ridky, J, Riggi, S, Risse, M, Ristori, P, Rivera, H, Rizi, V, Roberts, J, Rodrigues De Carvalho, W, Rodriguez, G, Rodriguez Martino, J, Rodriguez Rojo, J, Rodriguez-Cabo, I, Rodríguez-Frías, MD, Ros, G, Rosado, J, Rossler, T, Roth, M, Rouillé-D'Orfeuil, B, Roulet, E, Rovero, AC, Rühle, C, Saftoiu, A, Salamida, F, Salazar, H, Salesa Greus, F, Salina, G, Snchez, F, Santo, CE, Santos, E, Santos, EM, Sarazin, F, Sarkar, B, Sarkar, S, Sato, R, Scharf, N, Scherini, V, Schieler, H, Schiffer, P, Schmidt, A, Scholten, O, Schoorlemmer, H, Schovancova, J, Schovnek, P, Schröder, F, Schulte, S, Schuster, D, Sciutto, SJ, Scuderi, M, Segreto, A, Settimo, M, Shadkam, A, Shellard, RC, Sidelnik, I, Sigl, G, Silva Lopez, HH, Sima, O, 'Smiakowski, A, Mída, R, Snow, GR, Sommers, P, Sorokin, J, Spinka, H, Squartini, R, Srivastava, YN, Stanic, S, Stapleton, J, Stasielak, J, Stephan, M, Stutz, A, Suarez, F, Suomijärvi, T, Supanitsky, AD, Šuša, T, Sutherland, MS, Swain, J, Szadkowski, Z, Szuba, M, Tapia, A, Tartare, M, Tacu, O, Tavera Ruiz, CG, Tcaciuc, R, Tegolo, D, Thao, NT, Thomas, D, Tiffenberg, J, Timmermans, C, Tkaczyk, W, Todero Peixoto, CJ, Toma, G, Tomé, B, Tonachini, A, Travnicek, P, Tridapalli, DB, Tristram, G, Trovato, E, Tueros, M, Ulrich, R, Unger, M, Urban, M, Valdés Galicia, JF, Valĩo, I, Valore, L, Van Den Berg, AM, Varela, E, Vargas Cárdenas, B, Vázquez, JR, Vázquez, RA, Veberič, D, Verzi, V, Vicha, J, Videla, M, Villasẽor, L, Wahlberg, H, Wahrlich, P, Wainberg, O, Walz, D, Watson, AA, Weber, M, Weidenhaupt, K, Weindl, A, Werner, F, Westerhoff, S, Whelan, BJ, Widom, A, Wieczorek, G, Wiencke, L, Wilczyska, B, Wilczyski, H, Will, M, Williams, C, Winchen, T, Wommer, M, Wundheiler, B, Yamamoto, T, Yapici, T, Younk, P, Yuan, G, Yushkov, A, Zamorano, B, Zas, E, Zavrtanik, D, Zavrtanik, M, Zaw, I, Zepeda, A, Zhu, Y, Zimbres Silva, M & Ziolkowski, M 2012, 'A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory', Journal of Cosmology and Astroparticle Physics, vol. 2012, no. 4, 040. https://doi.org/10.1088/1475-7516/2012/04/040
Abreu, P. ; Aglietta, M. ; Ahlers, M. ; Ahn, E. J. ; Albuquerque, I. F M ; Allard, D. ; Allekotte, I. ; Allen, J. ; Allison, P. ; Almela, A. ; Alvarez Castillo, J. ; Alvarez-Mũiz, J. ; Ambrosio, M. ; Aminaei, A. ; Anchordoqui, L. ; Andringa, S. ; Antici'C, T. ; Aramo, C. ; Arganda, E. ; Arqueros, F. ; Asorey, H. ; Assis, P. ; Aublin, J. ; Ave, M. ; Avenier, M. ; Avila, G. ; Bäcker, T. ; Badescu, A. M. ; Balzer, M. ; Barber, K. B. ; Barbosa, A. F. ; Bardenet, R. ; Barroso, S. L C ; Baughman, B. ; Bäuml, J. ; Beatty, J. J. ; Becker, B. R. ; Becker, K. H. ; Bellétoile, A. ; Bellido, J. A. ; Benzvi, S. ; Berat, C. ; Bertou, X. ; Biermann, P. L. ; Billoir, P. ; Blanco, F. ; Blanco, M. ; Bleve, C. ; Blümer, H. ; Boháčová, M. ; Boncioli, D. ; Bonifazi, C. ; Bonino, R. ; Borodai, N. ; Brack, J. ; Brancus, I. ; Brogueira, P. ; Brown, W. C. ; Bruijn, R. ; Buchholz, P. ; Bueno, A. ; Burton, R. E. ; Caballero-Mora, K. S. ; Caccianiga, B. ; Caramete, L. ; Caruso, R. ; Castellina, A. ; Catalano, O. ; Cataldi, G. ; Cazon, L. ; Cester, R. ; Chauvin, J. ; Cheng, S. H. ; Chiavassa, A. ; Chinellato, J. A. ; Chirinos Diaz, J. ; Chudoba, J. ; Cilmo, M. ; Clay, R. W. ; Coluccia, M. R. ; Conceiço, R. ; Contreras, F. ; Cook, H. ; Cooper, M. J. ; Coppens, J. ; Cordier, A. ; Coutu, S. ; Covault, C. E. ; Creusot, A. ; Criss, A. ; Cronin, J. ; Curutiu, A. ; Dagoret-Campagne, S. ; Dallier, R. ; Dasso, S. ; Daumiller, K. ; Dawson, B. R. ; De Almeida, R. M. ; De Domenico, M. ; De Donato, C. ; De Jong, S. J. ; De La Vega, G. ; De Mello Junior, W. J M ; De Mello Neto, J. R T ; De Mitri, I. ; De Souza, V. ; De Vries, K. D. ; Del Peral, L. ; Del Río, M. ; Deligny, O. ; Dembinski, H. ; Dhital, N. ; Di Giulio, C. ; Díaz Castro, M. L. ; Diep, P. N. ; Diogo, F. ; Dobrigkeit, C. ; Docters, W. ; D'Olivo, J. C. ; Dong, P. N. ; Dorofeev, A. ; Dos Anjos, J. C. ; Dova, M. T. ; D'Urso, D. ; Dutan, I. ; Ebr, J. ; Engel, R. ; Erdmann, M. ; Escobar, C. O. ; Espadanal, J. ; Etchegoyen, A. ; Facal San Luis, P. ; Fajardo Tapia, I. ; Falcke, H. ; Farrar, G. ; Fauth, A. C. ; Fazzini, N. ; Ferguson, A. P. ; Fick, B. ; Filevich, A. ; Filipčič, A. ; Fliescher, S. ; Fracchiolla, C. E. ; Fraenkel, E. D. ; Fratu, O. ; Fröhlich, U. ; Fuchs, B. ; Gaior, R. ; Gamarra, R. F. ; Gambetta, S. ; García, B. ; Garcia Roca, S. T. ; Garcia-Gamez, D. ; Garcia-Pinto, D. ; Gascon, A. ; Gemmeke, H. ; Ghia, P. L. ; Giaccari, U. ; Giller, M. ; Glass, H. ; Gold, M. S. ; Golup, G. ; Gomez Albarracin, F. ; Gómez Berisso, M. ; Gómez Vitale, P. F. ; Gonçalves, P. ; Gonzalez, D. ; Gonzalez, J. G. ; Gookin, B. ; Gorgi, A. ; Gouffon, P. ; Grashorn, E. ; Grebe, S. ; Griffith, N. ; Grigat, M. ; Grillo, A. F. ; Guardincerri, Y. ; Guarino, F. ; Guedes, G. P. ; Guzman, A. ; Hague, J. D. ; Hansen, P. ; Harari, D. ; Harmsma, S. ; Harrison, T. A. ; Harton, J. L. ; Haungs, A. ; Hebbeker, T. ; Heck, D. ; Herve, A. E. ; Hojvat, C. ; Hollon, N. ; Holmes, V. C. ; Homola, P. ; Hörandel, J. R. ; Horneffer, A. ; Horvath, P. ; Hrabovský, M. ; Huege, T. ; Insolia, A. ; Ionita, F. ; Italiano, A. ; Jarne, C. ; Jiraskova, S. ; Josebachuili, M. ; Kadija, K. ; Kampert, K. H. ; Karhan, P. ; Kasper, P. ; Kégl, B. ; Keilhauer, B. ; Keivani, A. ; Kelley, J. L. ; Kemp, E. ; Kieckhafer, R. M. ; Klages, H. O. ; Kleifges, M. ; Kleinfeller, J. ; Knapp, J. ; Koang, D. H. ; Kotera, K. ; Krohm, N. ; Krömer, O. ; Kruppke-Hansen, D. ; Kuehn, F. ; Kuempel, D. ; Kulbartz, J. K. ; Kunka, N. ; La Rosa, G. ; Lachaud, C. ; Lauer, R. ; Lautridou, P. ; Le Coz, S. ; Leão, M. S A B ; Lebrun, D. ; Lebrun, P. ; Leigui De Oliveira, M. A. ; Letessier-Selvon, A. ; Lhenry-Yvon, I. ; Link, K. ; López, R. ; Lopez Agüera, A. ; Louedec, K. ; Lozano Bahilo, J. ; Lu, L. ; Lucero, A. ; Ludwig, M. ; Lyberis, H. ; MacOlino, C. ; Maldera, S. ; Mandat, D. ; Mantsch, P. ; Mariazzi, A. G. ; Marin, J. ; Marin, V. ; Maris, I. C. ; Marquez Falcon, H. R. ; Marsella, G. ; Martello, D. ; Martin, L. ; Martinez, H. ; Martínez Bravo, O. ; Mathes, H. J. ; Matthews, J. ; Matthews, J. A J ; Matthiae, G. ; Maurel, D. ; Maurizio, D. ; Mazur, P. O. ; Medina-Tanco, G. ; Melissas, M. ; Melo, D. ; Menichetti, E. ; Menshikov, A. ; Mertsch, P. ; Meurer, C. ; Mi'Canovi'C, S. ; Micheletti, M. I. ; Minaya, I. A. ; Miramonti, L. ; Molina-Bueno, L. ; Mollerach, S. ; Monasor, M. ; Monnier Ragaigne, D. ; Montanet, F. ; Morales, B. ; Morello, C. ; Moreno, E. ; Moreno, J. C. ; Mostafá, M. ; Moura, C. A. ; Muller, M. A. ; Müller, G. ; Münchmeyer, M. ; Mussa, R. ; Navarra, G. ; Navarro, J. L. ; Navas, S. ; Necesal, P. ; Nellen, L. ; Nelles, A. ; Neuser, J. ; Nhung, P. T. ; Niechciol, M. ; Niemietz, L. ; Nierstenhoefer, N. ; Nitz, D. ; Nosek, D. ; Nožka, L. ; Nyklicek, M. ; Oehlschläger, J. ; Olinto, A. ; Ortiz, M. ; Pacheco, N. ; Pakk Selmi-Dei, D. ; Palatka, M. ; Pallotta, J. ; Palmieri, N. ; Parente, G. ; Parizot, E. ; Parra, A. ; Pastor, S. ; Paul, T. ; Pech, M. ; Pekala, J. ; Pelayo, R. ; Pepe, I. M. ; Perrone, L. ; Pesce, R. ; Petermann, E. ; Petrera, S. ; Petrinca, P. ; Petrolini, A. ; Petrov, Y. ; Petrovic, J. ; Pfendner, C. ; Piegaia, R. ; Pierog, T. ; Pieroni, P. ; Pimenta, M. ; Pirronello, V. ; Platino, M. ; Ponce, V. H. ; Pontz, M. ; Porcelli, A. ; Privitera, P. ; Prouza, M. ; Quel, E. J. ; Querchfeld, S. ; Rautenberg, J. ; Ravel, O. ; Ravignani, D. ; Revenu, B. ; Ridky, J. ; Riggi, S. ; Risse, M. ; Ristori, P. ; Rivera, H. ; Rizi, V. ; Roberts, J. ; Rodrigues De Carvalho, W. ; Rodriguez, G. ; Rodriguez Martino, J. ; Rodriguez Rojo, J. ; Rodriguez-Cabo, I. ; Rodríguez-Frías, M. D. ; Ros, G. ; Rosado, J. ; Rossler, T. ; Roth, M. ; Rouillé-D'Orfeuil, B. ; Roulet, E. ; Rovero, A. C. ; Rühle, C. ; Saftoiu, A. ; Salamida, F. ; Salazar, H. ; Salesa Greus, F. ; Salina, G. ; Snchez, F. ; Santo, C. E. ; Santos, E. ; Santos, E. M. ; Sarazin, F. ; Sarkar, B. ; Sarkar, S. ; Sato, R. ; Scharf, N. ; Scherini, V. ; Schieler, H. ; Schiffer, P. ; Schmidt, A. ; Scholten, O. ; Schoorlemmer, H. ; Schovancova, J. ; Schovnek, P. ; Schröder, F. ; Schulte, S. ; Schuster, D. ; Sciutto, S. J. ; Scuderi, M. ; Segreto, A. ; Settimo, M. ; Shadkam, A. ; Shellard, R. C. ; Sidelnik, I. ; Sigl, G. ; Silva Lopez, H. H. ; Sima, O. ; 'Smiakowski, A. ; Mída, R. ; Snow, G. R. ; Sommers, P. ; Sorokin, J. ; Spinka, H. ; Squartini, R. ; Srivastava, Y. N. ; Stanic, S. ; Stapleton, J. ; Stasielak, J. ; Stephan, M. ; Stutz, A. ; Suarez, F. ; Suomijärvi, T. ; Supanitsky, A. D. ; Šuša, T. ; Sutherland, M. S. ; Swain, J. ; Szadkowski, Z. ; Szuba, M. ; Tapia, A. ; Tartare, M. ; Tacu, O. ; Tavera Ruiz, C. G. ; Tcaciuc, R. ; Tegolo, D. ; Thao, N. T. ; Thomas, D. ; Tiffenberg, J. ; Timmermans, C. ; Tkaczyk, W. ; Todero Peixoto, C. J. ; Toma, G. ; Tomé, B. ; Tonachini, A. ; Travnicek, P. ; Tridapalli, D. B. ; Tristram, G. ; Trovato, E. ; Tueros, M. ; Ulrich, R. ; Unger, M. ; Urban, M. ; Valdés Galicia, J. F. ; Valĩo, I. ; Valore, L. ; Van Den Berg, A. M. ; Varela, E. ; Vargas Cárdenas, B. ; Vázquez, J. R. ; Vázquez, R. A. ; Veberič, D. ; Verzi, V. ; Vicha, J. ; Videla, M. ; Villasẽor, L. ; Wahlberg, H. ; Wahrlich, P. ; Wainberg, O. ; Walz, D. ; Watson, A. A. ; Weber, M. ; Weidenhaupt, K. ; Weindl, A. ; Werner, F. ; Westerhoff, S. ; Whelan, B. j. ; Widom, A. ; Wieczorek, G. ; Wiencke, L. ; Wilczyska, B. ; Wilczyski, H. ; Will, M. ; Williams, C. ; Winchen, T. ; Wommer, M. ; Wundheiler, B. ; Yamamoto, T. ; Yapici, T. ; Younk, P. ; Yuan, G. ; Yushkov, A. ; Zamorano, B. ; Zas, E. ; Zavrtanik, D. ; Zavrtanik, M. ; Zaw, Ingyin ; Zepeda, A. ; Zhu, Y. ; Zimbres Silva, M. ; Ziolkowski, M. / A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory. In: Journal of Cosmology and Astroparticle Physics. 2012 ; Vol. 2012, No. 4.
@article{e5e0badd239f4106a584651179009274,
title = "A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory",
abstract = "Observations of cosmic ray arrival directions made with the Pierre Auger Observatory have previously provided evidence of anisotropy at the 99{\%} CL using the correlation of ultra high energy cosmic rays (UHECRs) with objects drawn from the V{\'e}ron-Cetty V{\'e}ron catalog. In this paper we report on the use of three catalog independent methods to search for anisotropy. The 2pt-L, 2pt+ and 3pt methods, each giving a different measure of self-clustering in arrival directions, were tested on mock cosmic ray data sets to study the impacts of sample size and magnetic smearing on their results, accounting for both angular and energy resolutions. If the sources of UHECRs follow the same large scale structure as ordinary galaxies in the local Universe and if UHECRs are deflected no more than a few degrees, a study of mock maps suggests that these three methods can efficiently respond to the resulting anisotropy with a P-value = 1.0{\%} or smaller with data sets as few as 100 events. Using data taken from January 1, 2004 to July 31, 2010 we examined the 20,30,110 highest energy events with a corresponding minimum energy threshold of about 49.3 EeV. The minimum P-values found were 13.5{\%} using the 2pt-L method, 1.0{\%} using the 2pt+ method and 1.1{\%} using the 3pt method for the highest 100 energy events. In view of the multiple (correlated) scans performed on the data set, these catalog-independent methods do not yield strong evidence of anisotropy in the highest energy cosmic rays.",
author = "P. Abreu and M. Aglietta and M. Ahlers and Ahn, {E. J.} and Albuquerque, {I. F M} and D. Allard and I. Allekotte and J. Allen and P. Allison and A. Almela and {Alvarez Castillo}, J. and J. Alvarez-Mũiz and M. Ambrosio and A. Aminaei and L. Anchordoqui and S. Andringa and T. Antici'C and C. Aramo and E. Arganda and F. Arqueros and H. Asorey and P. Assis and J. Aublin and M. Ave and M. Avenier and G. Avila and T. B{\"a}cker and Badescu, {A. M.} and M. Balzer and Barber, {K. B.} and Barbosa, {A. F.} and R. Bardenet and Barroso, {S. L C} and B. Baughman and J. B{\"a}uml and Beatty, {J. J.} and Becker, {B. R.} and Becker, {K. H.} and A. Bell{\'e}toile and Bellido, {J. A.} and S. Benzvi and C. Berat and X. Bertou and Biermann, {P. L.} and P. Billoir and F. Blanco and M. Blanco and C. Bleve and H. Bl{\"u}mer and M. Boh{\'a}čov{\'a} and D. Boncioli and C. Bonifazi and R. Bonino and N. Borodai and J. Brack and I. Brancus and P. Brogueira and Brown, {W. C.} and R. Bruijn and P. Buchholz and A. Bueno and Burton, {R. E.} and Caballero-Mora, {K. S.} and B. Caccianiga and L. Caramete and R. Caruso and A. Castellina and O. Catalano and G. Cataldi and L. Cazon and R. Cester and J. Chauvin and Cheng, {S. H.} and A. Chiavassa and Chinellato, {J. A.} and {Chirinos Diaz}, J. and J. Chudoba and M. Cilmo and Clay, {R. W.} and Coluccia, {M. R.} and R. Concei{\cc}o and F. Contreras and H. Cook and Cooper, {M. J.} and J. Coppens and A. Cordier and S. Coutu and Covault, {C. E.} and A. Creusot and A. Criss and J. Cronin and A. Curutiu and S. Dagoret-Campagne and R. Dallier and S. Dasso and K. Daumiller and Dawson, {B. R.} and {De Almeida}, {R. M.} and {De Domenico}, M. and {De Donato}, C. and {De Jong}, {S. J.} and {De La Vega}, G. and {De Mello Junior}, {W. J M} and {De Mello Neto}, {J. R T} and {De Mitri}, I. and {De Souza}, V. and {De Vries}, {K. D.} and {Del Peral}, L. and {Del R{\'i}o}, M. and O. Deligny and H. Dembinski and N. Dhital and {Di Giulio}, C. and {D{\'i}az Castro}, {M. L.} and Diep, {P. N.} and F. Diogo and C. Dobrigkeit and W. Docters and D'Olivo, {J. C.} and Dong, {P. N.} and A. Dorofeev and {Dos Anjos}, {J. C.} and Dova, {M. T.} and D. D'Urso and I. Dutan and J. Ebr and R. Engel and M. Erdmann and Escobar, {C. O.} and J. Espadanal and A. Etchegoyen and {Facal San Luis}, P. and {Fajardo Tapia}, I. and H. Falcke and G. Farrar and Fauth, {A. C.} and N. Fazzini and Ferguson, {A. P.} and B. Fick and A. Filevich and A. Filipčič and S. Fliescher and Fracchiolla, {C. E.} and Fraenkel, {E. D.} and O. Fratu and U. Fr{\"o}hlich and B. Fuchs and R. Gaior and Gamarra, {R. F.} and S. Gambetta and B. Garc{\'i}a and {Garcia Roca}, {S. T.} and D. Garcia-Gamez and D. Garcia-Pinto and A. Gascon and H. Gemmeke and Ghia, {P. L.} and U. Giaccari and M. Giller and H. Glass and Gold, {M. S.} and G. Golup and {Gomez Albarracin}, F. and {G{\'o}mez Berisso}, M. and {G{\'o}mez Vitale}, {P. F.} and P. Gon{\cc}alves and D. Gonzalez and Gonzalez, {J. G.} and B. Gookin and A. Gorgi and P. Gouffon and E. Grashorn and S. Grebe and N. Griffith and M. Grigat and Grillo, {A. F.} and Y. Guardincerri and F. Guarino and Guedes, {G. P.} and A. Guzman and Hague, {J. D.} and P. Hansen and D. Harari and S. Harmsma and Harrison, {T. A.} and Harton, {J. L.} and A. Haungs and T. Hebbeker and D. Heck and Herve, {A. E.} and C. Hojvat and N. Hollon and Holmes, {V. C.} and P. Homola and H{\"o}randel, {J. R.} and A. Horneffer and P. Horvath and M. Hrabovsk{\'y} and T. Huege and A. Insolia and F. Ionita and A. Italiano and C. Jarne and S. Jiraskova and M. Josebachuili and K. Kadija and Kampert, {K. H.} and P. Karhan and P. Kasper and B. K{\'e}gl and B. Keilhauer and A. Keivani and Kelley, {J. L.} and E. Kemp and Kieckhafer, {R. M.} and Klages, {H. O.} and M. Kleifges and J. Kleinfeller and J. Knapp and Koang, {D. H.} and K. Kotera and N. Krohm and O. Kr{\"o}mer and D. Kruppke-Hansen and F. Kuehn and D. Kuempel and Kulbartz, {J. K.} and N. Kunka and {La Rosa}, G. and C. Lachaud and R. Lauer and P. Lautridou and {Le Coz}, S. and Le{\~a}o, {M. S A B} and D. Lebrun and P. Lebrun and {Leigui De Oliveira}, {M. A.} and A. Letessier-Selvon and I. Lhenry-Yvon and K. Link and R. L{\'o}pez and {Lopez Ag{\"u}era}, A. and K. Louedec and {Lozano Bahilo}, J. and L. Lu and A. Lucero and M. Ludwig and H. Lyberis and C. MacOlino and S. Maldera and D. Mandat and P. Mantsch and Mariazzi, {A. G.} and J. Marin and V. Marin and Maris, {I. C.} and {Marquez Falcon}, {H. R.} and G. Marsella and D. Martello and L. Martin and H. Martinez and {Mart{\'i}nez Bravo}, O. and Mathes, {H. J.} and J. Matthews and Matthews, {J. A J} and G. Matthiae and D. Maurel and D. Maurizio and Mazur, {P. O.} and G. Medina-Tanco and M. Melissas and D. Melo and E. Menichetti and A. Menshikov and P. Mertsch and C. Meurer and S. Mi'Canovi'C and Micheletti, {M. I.} and Minaya, {I. A.} and L. Miramonti and L. Molina-Bueno and S. Mollerach and M. Monasor and {Monnier Ragaigne}, D. and F. Montanet and B. Morales and C. Morello and E. Moreno and Moreno, {J. C.} and M. Mostaf{\'a} and Moura, {C. A.} and Muller, {M. A.} and G. M{\"u}ller and M. M{\"u}nchmeyer and R. Mussa and G. Navarra and Navarro, {J. L.} and S. Navas and P. Necesal and L. Nellen and A. Nelles and J. Neuser and Nhung, {P. T.} and M. Niechciol and L. Niemietz and N. Nierstenhoefer and D. Nitz and D. Nosek and L. Nožka and M. Nyklicek and J. Oehlschl{\"a}ger and A. Olinto and M. Ortiz and N. Pacheco and {Pakk Selmi-Dei}, D. and M. Palatka and J. Pallotta and N. Palmieri and G. Parente and E. Parizot and A. Parra and S. Pastor and T. Paul and M. Pech and J. Pekala and R. Pelayo and Pepe, {I. M.} and L. Perrone and R. Pesce and E. Petermann and S. Petrera and P. Petrinca and A. Petrolini and Y. Petrov and J. Petrovic and C. Pfendner and R. Piegaia and T. Pierog and P. Pieroni and M. Pimenta and V. Pirronello and M. Platino and Ponce, {V. H.} and M. Pontz and A. Porcelli and P. Privitera and M. Prouza and Quel, {E. J.} and S. Querchfeld and J. Rautenberg and O. Ravel and D. Ravignani and B. Revenu and J. Ridky and S. Riggi and M. Risse and P. Ristori and H. Rivera and V. Rizi and J. Roberts and {Rodrigues De Carvalho}, W. and G. Rodriguez and {Rodriguez Martino}, J. and {Rodriguez Rojo}, J. and I. Rodriguez-Cabo and Rodr{\'i}guez-Fr{\'i}as, {M. D.} and G. Ros and J. Rosado and T. Rossler and M. Roth and B. Rouill{\'e}-D'Orfeuil and E. Roulet and Rovero, {A. C.} and C. R{\"u}hle and A. Saftoiu and F. Salamida and H. Salazar and {Salesa Greus}, F. and G. Salina and F. Snchez and Santo, {C. E.} and E. Santos and Santos, {E. M.} and F. Sarazin and B. Sarkar and S. Sarkar and R. Sato and N. Scharf and V. Scherini and H. Schieler and P. Schiffer and A. Schmidt and O. Scholten and H. Schoorlemmer and J. Schovancova and P. Schovnek and F. Schr{\"o}der and S. Schulte and D. Schuster and Sciutto, {S. J.} and M. Scuderi and A. Segreto and M. Settimo and A. Shadkam and Shellard, {R. C.} and I. Sidelnik and G. Sigl and {Silva Lopez}, {H. H.} and O. Sima and A. 'Smiakowski and R. M{\'i}da and Snow, {G. R.} and P. Sommers and J. Sorokin and H. Spinka and R. Squartini and Srivastava, {Y. N.} and S. Stanic and J. Stapleton and J. Stasielak and M. Stephan and A. Stutz and F. Suarez and T. Suomij{\"a}rvi and Supanitsky, {A. D.} and T. Šuša and Sutherland, {M. S.} and J. Swain and Z. Szadkowski and M. Szuba and A. Tapia and M. Tartare and O. Tacu and {Tavera Ruiz}, {C. G.} and R. Tcaciuc and D. Tegolo and Thao, {N. T.} and D. Thomas and J. Tiffenberg and C. Timmermans and W. Tkaczyk and {Todero Peixoto}, {C. J.} and G. Toma and B. Tom{\'e} and A. Tonachini and P. Travnicek and Tridapalli, {D. B.} and G. Tristram and E. Trovato and M. Tueros and R. Ulrich and M. Unger and M. Urban and {Vald{\'e}s Galicia}, {J. F.} and I. Valĩo and L. Valore and {Van Den Berg}, {A. M.} and E. Varela and {Vargas C{\'a}rdenas}, B. and V{\'a}zquez, {J. R.} and V{\'a}zquez, {R. A.} and D. Veberič and V. Verzi and J. Vicha and M. Videla and L. Villasẽor and H. Wahlberg and P. Wahrlich and O. Wainberg and D. Walz and Watson, {A. A.} and M. Weber and K. Weidenhaupt and A. Weindl and F. Werner and S. Westerhoff and Whelan, {B. j.} and A. Widom and G. Wieczorek and L. Wiencke and B. Wilczyska and H. Wilczyski and M. Will and C. Williams and T. Winchen and M. Wommer and B. Wundheiler and T. Yamamoto and T. Yapici and P. Younk and G. Yuan and A. Yushkov and B. Zamorano and E. Zas and D. Zavrtanik and M. Zavrtanik and Ingyin Zaw and A. Zepeda and Y. Zhu and {Zimbres Silva}, M. and M. Ziolkowski",
year = "2012",
month = "4",
doi = "10.1088/1475-7516/2012/04/040",
language = "English (US)",
volume = "2012",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing Ltd.",
number = "4",

}

TY - JOUR

T1 - A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory

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AU - Williams, C.

AU - Winchen, T.

AU - Wommer, M.

AU - Wundheiler, B.

AU - Yamamoto, T.

AU - Yapici, T.

AU - Younk, P.

AU - Yuan, G.

AU - Yushkov, A.

AU - Zamorano, B.

AU - Zas, E.

AU - Zavrtanik, D.

AU - Zavrtanik, M.

AU - Zaw, Ingyin

AU - Zepeda, A.

AU - Zhu, Y.

AU - Zimbres Silva, M.

AU - Ziolkowski, M.

PY - 2012/4

Y1 - 2012/4

N2 - Observations of cosmic ray arrival directions made with the Pierre Auger Observatory have previously provided evidence of anisotropy at the 99% CL using the correlation of ultra high energy cosmic rays (UHECRs) with objects drawn from the Véron-Cetty Véron catalog. In this paper we report on the use of three catalog independent methods to search for anisotropy. The 2pt-L, 2pt+ and 3pt methods, each giving a different measure of self-clustering in arrival directions, were tested on mock cosmic ray data sets to study the impacts of sample size and magnetic smearing on their results, accounting for both angular and energy resolutions. If the sources of UHECRs follow the same large scale structure as ordinary galaxies in the local Universe and if UHECRs are deflected no more than a few degrees, a study of mock maps suggests that these three methods can efficiently respond to the resulting anisotropy with a P-value = 1.0% or smaller with data sets as few as 100 events. Using data taken from January 1, 2004 to July 31, 2010 we examined the 20,30,110 highest energy events with a corresponding minimum energy threshold of about 49.3 EeV. The minimum P-values found were 13.5% using the 2pt-L method, 1.0% using the 2pt+ method and 1.1% using the 3pt method for the highest 100 energy events. In view of the multiple (correlated) scans performed on the data set, these catalog-independent methods do not yield strong evidence of anisotropy in the highest energy cosmic rays.

AB - Observations of cosmic ray arrival directions made with the Pierre Auger Observatory have previously provided evidence of anisotropy at the 99% CL using the correlation of ultra high energy cosmic rays (UHECRs) with objects drawn from the Véron-Cetty Véron catalog. In this paper we report on the use of three catalog independent methods to search for anisotropy. The 2pt-L, 2pt+ and 3pt methods, each giving a different measure of self-clustering in arrival directions, were tested on mock cosmic ray data sets to study the impacts of sample size and magnetic smearing on their results, accounting for both angular and energy resolutions. If the sources of UHECRs follow the same large scale structure as ordinary galaxies in the local Universe and if UHECRs are deflected no more than a few degrees, a study of mock maps suggests that these three methods can efficiently respond to the resulting anisotropy with a P-value = 1.0% or smaller with data sets as few as 100 events. Using data taken from January 1, 2004 to July 31, 2010 we examined the 20,30,110 highest energy events with a corresponding minimum energy threshold of about 49.3 EeV. The minimum P-values found were 13.5% using the 2pt-L method, 1.0% using the 2pt+ method and 1.1% using the 3pt method for the highest 100 energy events. In view of the multiple (correlated) scans performed on the data set, these catalog-independent methods do not yield strong evidence of anisotropy in the highest energy cosmic rays.

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U2 - 10.1088/1475-7516/2012/04/040

DO - 10.1088/1475-7516/2012/04/040

M3 - Article

AN - SCOPUS:84860606129

VL - 2012

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 4

M1 - 040

ER -