Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
High Energy Astrophysical Phenomena
2014-11-21 v2
Abstract
Data collected by the Pierre Auger Observatory through 31 August 2007 showed evidence for anisotropy in the arrival directions of cosmic rays above the Greisen-Zatsepin-Kuz'min energy threshold, \nobreak{eV}. The anisotropy was measured by the fraction of arrival directions that are less than from the position of an active galactic nucleus within 75 Mpc (using the V\'eron-Cetty and V\'eron catalog). An updated measurement of this fraction is reported here using the arrival directions of cosmic rays recorded above the same energy threshold through 31 December 2009. The number of arrival directions has increased from 27 to 69, allowing a more precise measurement. The correlating fraction is , compared with expected for isotropic cosmic rays. This is down from the early estimate of . The enlarged set of arrival directions is examined also in relation to other populations of nearby extragalactic objects: galaxies in the 2 Microns All Sky Survey and active galactic nuclei detected in hard X-rays by the Swift Burst Alert Telescope. A celestial region around the position of the radiogalaxy Cen A has the largest excess of arrival directions relative to isotropic expectations. The 2-point autocorrelation function is shown for the enlarged set of arrival directions and compared to the isotropic expectation.
Keywords
Cite
@article{arxiv.1009.1855,
title = {Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter},
author = {The Pierre Auger Collaboration and P. Abreu and M. Aglietta and E. J. Ahn and D. Allard and I. Allekotte and J. Allen and J. Alvarez Castillo and J. Alvarez-Muñiz and M. Ambrosio and A. Aminaei and L. Anchordoqui and S. Andringa and T. Antičić and A. Anzalone and C. Aramo and E. Arganda and K. Arisaka and F. Arqueros and H. Asorey and P. Assis and J. Aublin and M. Ave and M. Avenier and G. Avila and T. Bäcker and D. Badagnani and M. Balzer and K. B. Barber and A. F. Barbosa and R. Bardenet and S. L. C. Barroso and B. Baughman and J. J. Beatty and B. R. Becker and K. H. Becker and A. Bellétoile and J. A. Bellido and C. Berat and T. Bergmann and X. Bertou and P. L. Biermann and P. Billoir and F. Blanco and M. Blanco and C. Bleve and H. Blümer and M. Boháčová and D. Boncioli and C. Bonifazi and R. Bonino and N. Borodai and J. Brack and P. Brogueira and W. C. Brown and R. Bruijn and P. Buchholz and A. Bueno and R. E. Burton and N. G. Busca and K. S. Caballero-Mora 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 A. Chiavassa and J. A. Chinellato and A. Chou and J. Chudoba and R. W. Clay and E. Colombo and M. R. Coluccia and R. Conceição and F. Contreras and H. Cook and M. J. Cooper and J. Coppens and A. Cordier and U. Cotti and S. Coutu and C. E. Covault 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 B. R. Dawson and R. M. de Almeida and M. De Domenico and C. De Donato and S. J. de Jong and G. De La Vega and W. J. M. de Mello Junior and J. R. T. de Mello Neto and I. De Mitri and V. de Souza and K. D. de Vries and G. Decerprit and L. del Peral and O. Deligny and A. Della Selva and H. Dembinski and A. Denkiewicz and C. Di Giulio and J. C. Diaz and M. L. Díaz Castro and P. N. Diep and C. Dobrigkeit and J. C. D'Olivo and P. N. Dong and A. Dorofeev and J. C. dos Anjos and M. T. Dova and D. D'Urso and I. Dutan and J. Ebr and R. Engel and M. Erdmann and C. O. Escobar and A. Etchegoyen and P. Facal San Luis and H. Falcke and G. Farrar and A. C. Fauth and N. Fazzini and A. P. Ferguson and A. Ferrero and B. Fick and A. Filevich and A. Filipčič and I. Fleck and S. Fliescher and C. E. Fracchiolla and E. D. Fraenkel and U. Fröhlich and B. Fuchs and W. Fulgione and R. F. Gamarra and S. Gambetta and B. García and D. García Gámez and D. Garcia-Pinto and X. Garrido and A. Gascon and G. Gelmini and H. Gemmeke and K. Gesterling and P. L. Ghia and U. Giaccari and M. Giller and H. Glass and M. S. Gold and G. Golup and F. Gomez Albarracin and M. Gómez Berisso and P. Gonçalves and D. Gonzalez and J. G. Gonzalez and B. Gookin and D. Góra and A. Gorgi and P. Gouffon and S. R. Gozzini and E. Grashorn and S. Grebe and M. Grigat and A. F. Grillo and Y. Guardincerri F. Guarino and G. P. Guedes and J. D. Hague and P. Hansen D. Harari S. Harmsma and J. L. Harton and A. Haungs and T. Hebbeker and D. Heck and A. E. Herve and C. Hojvat and V. C. Holmes and P. Homola and J. R. Hörandel and A. Horneffer and M. Hrabovský and T. Huege and A. Insolia and F. Ionita and A. Italiano and S. Jiraskova and K. Kadija and M. Kaducak and K. H. Kampert and P. Karhan and T. Karova and P. Kasper and B. Kégl and B. Keilhauer and A. Keivani and J. L. Kelley and E. Kemp and R. M. Kieckhafer and H. O. Klages and M. Kleifges and J. Kleinfeller and J. Knapp and D. -H. Koang and K. Kotera and N. Krohm and O. Krömer and D. Kruppke-Hansen and F. Kuehn and D. Kuempel and J. K. Kulbartz and N. Kunka and G. La Rosa and C. Lachaud and P. Lautridou and M. S. A. B. Leão and D. Lebrun and P. Lebrun and M. A. Leigui de Oliveira and A. Lemiere and A. Letessier-Selvon and I. Lhenry-Yvon and K. Link and R. López and A. Lopez Agüera and K. Louedec and J. Lozano Bahilo and A. Lucero and M. Ludwig and H. Lyberis and M. C. Maccarone and C. Macolino and S. Maldera and D. Mandat and P. Mantsch and A. G. Mariazzi and V. Marin and I. C. Maris and H. R. Marquez Falcon and G. Marsella and D. Martello and L. Martin and O. Martínez Bravo and H. J. Mathes and J. Matthews and J. A. J. Matthews and G. Matthiae and D. Maurizio and P. O. Mazur and M. McEwen and G. Medina-Tanco and M. Melissas and D. Melo and E. Menichetti and A. Menshikov and C. Meurer and S. Mičanović and M. I. Micheletti and W. Miller and L. Miramonti and S. Mollerach and M. Monasor and D. Monnier Ragaigne and F. Montanet and B. Morales and C. Morello and E. Moreno and J. C. Moreno C. Morris and M. Mostafá and S. Mueller and M. A. Muller and M. Münchmeyer and R. Mussa and G. Navarra and J. L. Navarro and S. Navas and P. Necesal and L. Nellen and P. T. Nhung and N. Nierstenhoefer and D. Nitz and D. Nosek and L. Nožka and M. Nyklicek and J. Oehlschläger and A. Olinto and P. Oliva and V. M. Olmos-Gilbaja and M. Ortiz and N. Pacheco and D. Pakk Selmi-Dei and M. Palatka and J. Pallotta N. Palmieri and G. Parente and E. Parizot and A. Parra and J. Parrisius and R. D. Parsons and S. Pastor and T. Paul and V. Pavlidou and K. Payet and M. Pech and J. Pȩkala and R. Pelayo and I. M. Pepe 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 N. Phan and R. Piegaia and T. Pierog and M. Pimenta and V. Pirronello and M. Platino and V. H. Ponce and M. Pontz and P. Privitera and M. Prouza and E. J. Quel 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 C. Rivière and V. Rizi and C. Robledo and G. Rodriguez and J. Rodriguez Martino and J. Rodriguez Rojo and I. Rodriguez-Cabo and M. D. Rodríguez-Frías and G. Ros and J. Rosado and T. Rossler and M. Roth and B. Rouillé-d'Orfeuil and E. Roulet and A. C. Rovero and F. Salamida and H. Salazar and G. Salina and F. Sánchez and M. Santander and C. E. Santo and E. Santos and E. M. Santos and F. Sarazin and S. Sarkar and R. Sato and N. Scharf and V. Scherini and H. Schieler and P. Schiffer and A. Schmidt and F. Schmidt and T. Schmidt and O. Scholten and H. Schoorlemmer and J. Schovancova and P. Schovánek and F. Schroeder and S. Schulte and F. Schüssler and D. Schuster and S. J. Sciutto and M. Scuderi and A. Segreto and M. Settimo and A. Shadkam and R. C. Shellard and I. Sidelnik and G. Sigl and A. Śmiałkowski and R. Šmída and G. R. Snow and P. Sommers and J. Sorokin and H. Spinka and R. Squartini and J. Stapleton and J. Stasielak and M. Stephan and E. Strazzeri and A. Stutz and F. Suarez and T. Suomijärvi and A. D. Supanitsky and T. Šuša and M. S. Sutherland and J. Swain and Z. Szadkowski and A. Tamashiro and A. Tapia and T. Tarutina and O. Taşcău and R. Tcaciuc and D. Tcherniakhovski and D. Tegolo and N. T. Thao and D. Thomas and J. Tiffenberg and C. Timmermans and D. K. Tiwari and W. Tkaczyk and C. J. Todero Peixoto and B. Tomé and A. Tonachini and P. Travnicek and D. B. Tridapalli and G. Tristram and E. Trovato and M. Tueros and R. Ulrich and M. Unger and M. Urban and J. F. Valdés Galicia and I. Valiño and L. Valore and A. M. van den Berg and B. Vargas Cárdenas and J. R. Vázquez and R. A. Vázquez and D. Veberič and T. Venters and V. Verzi and M. Videla and L. Villaseñor and H. Wahlberg and P. Wahrlich and O. Wainberg and D. Warner and A. A. Watson and K. Weidenhaupt and A. Weindl and B. J. Whelan and G. Wieczorek and L. Wiencke and B. Wilczyńska and H. Wilczyński and M. Will and C. Williams and T. Winchen and L. Winders and M. G. Winnick and M. Wommer and B. Wundheiler and T. Yamamoto and P. Younk and G. Yuan and A. Yushkov and B. Zamorano and E. Zas and D. Zavrtanik and M. Zavrtanik and I. Zaw and A. Zepeda and M. Ziolkowski},
journal= {arXiv preprint arXiv:1009.1855},
year = {2014}
}
Comments
Accepted for publication in Astroparticle Physics on 31 August 2010