NAGIOS: RODERIC FUNCIONANDO

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

DSpace Repository

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

dc.contributor.author	The Pierre Auger Collaboration
dc.contributor.author	Pastor Carpi, Sergio
dc.date.accessioned	2015-11-03T12:25:02Z
dc.date.available	2015-11-03T12:25:02Z
dc.date.issued	2010
dc.identifier.uri	http://hdl.handle.net/10550/48018
dc.description.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, 6×10^19 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 Véron-Cetty and Véron 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). 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.
dc.language.iso	eng
dc.relation.ispartof	Astroparticle Physics, 2010, vol. 34, num. 5, p. 314-326
dc.rights.uri	info:eu-repo/semantics/openAccess
dc.source	The Pierre Auger Collaboration Pastor Carpi, Sergio 2010 Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter Astroparticle Physics 34 5 314 326
dc.subject	Física
dc.title	Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
dc.type	info:eu-repo/semantics/article
dc.date.updated	2015-11-03T12:25:03Z
dc.identifier.doi	http://dx.doi.org/10.1016/j.astropartphys.2010.08.010
dc.identifier.idgrec	065099