Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter

0354533 - FZÚ 2011 RIV NL eng J - Journal Article
Abreu, P. - Aglietta, M. - Ahn, E.J. - Boháčová, Martina - Chudoba, Jiří - Kárová, Tatiana - Mandát, Dušan - Nečesal, Petr - Nožka, Libor - Nyklíček, M. - Palatka, Miroslav - Pech, Miroslav - Prouza, Michael - Řídký, Jan - Schovancová, Jaroslava - Schovánek, Petr - Šmída, Radomír - Trávníček, Petr
Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter.
Astroparticle Physics. Roč. 34, č. 5 (2010), s. 314-326. ISSN 0927-6505. E-ISSN 1873-2852
R&D Projects: GA MŠMT(CZ) 1M06002; GA MŠMT(CZ) LA08016; GA AV ČR KJB100100904; GA MŠMT LC527; GA AV ČR KJB300100801
Institutional research plan: CEZ:AV0Z10100502; CEZ:AV0Z10100522
Keywords : cosmic ray * UHECR
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.808, year: 2010

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, 6 x 1019 eV. The anisotropy was measured by the fraction of arrival directions that are less than 3.1° from the position of an active galactic nucleus within 75 Mpc (using the Veron-Cetty and Veron 12th 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 (38+7-6)%, compared with 21% expected for isotropic cosmic rays. This is down from the early estimate of (69+11-13)%.
Permanent Link: http://hdl.handle.net/11104/0193514