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

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...

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Autores principales: Arganda Carreras, Ernesto, Dova, María Teresa, Gómez Albarracín, Flavia Alejandra, Hansen, Patricia María, Jarne, Cecilia Gisele, Mariazzi, Analisa Gabriela, Moreno, Juan Cruz, Sciutto, Sergio Juan, Wahlberg, Hernán Pablo, The Pierre Auger Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Exactas
Física
ultra high energy cosmic rays
Altas energías
Radiación cósmica
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/80833
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-80833
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
ultra high energy cosmic rays
Altas energías
Radiación cósmica
spellingShingle Ciencias Exactas
Física
ultra high energy cosmic rays
Altas energías
Radiación cósmica
Arganda Carreras, Ernesto
Dova, María Teresa
Gómez Albarracín, Flavia Alejandra
Hansen, Patricia María
Jarne, Cecilia Gisele
Mariazzi, Analisa Gabriela
Moreno, Juan Cruz
Sciutto, Sergio Juan
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
topic_facet Ciencias Exactas
Física
ultra high energy cosmic rays
Altas energías
Radiación cósmica
description 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 selfclustering 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.
format Articulo
Articulo
author Arganda Carreras, Ernesto
Dova, María Teresa
Gómez Albarracín, Flavia Alejandra
Hansen, Patricia María
Jarne, Cecilia Gisele
Mariazzi, Analisa Gabriela
Moreno, Juan Cruz
Sciutto, Sergio Juan
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_facet Arganda Carreras, Ernesto
Dova, María Teresa
Gómez Albarracín, Flavia Alejandra
Hansen, Patricia María
Jarne, Cecilia Gisele
Mariazzi, Analisa Gabriela
Moreno, Juan Cruz
Sciutto, Sergio Juan
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_sort Arganda Carreras, Ernesto
title A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
title_short A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
title_full A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
title_fullStr A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
title_full_unstemmed A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
title_sort search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the pierre auger observatory
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/80833
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