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

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 10<sup>19</sup> eV. The anisotropy was measured by the fraction of arrival directions tha...

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Detalles Bibliográficos
Autores principales: Badagnani, Daniel Omar, Dova, María Teresa, Gómez Albarracín, Flavia Alejandra, Hansen, Patricia María, Mariazzi, Analisa Gabriela, Moreno, Juan Cruz, Sciutto, Sergio Juan, Tarutina, Tatiana, Tueros, Matías Jorge, Wahlberg, Hernán Pablo, The Pierre Auger Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Exactas
Física
Radiación Cósmica
Anisotropía
Pierre Auger Observatory
Greisen–Zatsepin–Kuz’min
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/80649
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-80649
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Radiación Cósmica
Anisotropía
Pierre Auger Observatory
Greisen–Zatsepin–Kuz’min
spellingShingle Ciencias Exactas
Física
Radiación Cósmica
Anisotropía
Pierre Auger Observatory
Greisen–Zatsepin–Kuz’min
Badagnani, Daniel Omar
Dova, María Teresa
Gómez Albarracín, Flavia Alejandra
Hansen, Patricia María
Mariazzi, Analisa Gabriela
Moreno, Juan Cruz
Sciutto, Sergio Juan
Tarutina, Tatiana
Tueros, Matías Jorge
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
topic_facet Ciencias Exactas
Física
Radiación Cósmica
Anisotropía
Pierre Auger Observatory
Greisen–Zatsepin–Kuz’min
description 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 10<sup>19</sup> eV. The anisotropy was measured by the fraction of arrival directions that are less than 3.1º 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<sup>+7</sup><sub>-6</sub>)%, compared with 21% expected for isotropic cosmic rays. This is down from the early estimate of (69<sup>+11</sup><sub>-13</sub>)%. 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.
format Articulo
Articulo
author Badagnani, Daniel Omar
Dova, María Teresa
Gómez Albarracín, Flavia Alejandra
Hansen, Patricia María
Mariazzi, Analisa Gabriela
Moreno, Juan Cruz
Sciutto, Sergio Juan
Tarutina, Tatiana
Tueros, Matías Jorge
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_facet Badagnani, Daniel Omar
Dova, María Teresa
Gómez Albarracín, Flavia Alejandra
Hansen, Patricia María
Mariazzi, Analisa Gabriela
Moreno, Juan Cruz
Sciutto, Sergio Juan
Tarutina, Tatiana
Tueros, Matías Jorge
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_sort Badagnani, Daniel Omar
title Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
title_short Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
title_full Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
title_fullStr Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
title_full_unstemmed Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
title_sort update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/80649
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