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

Detalhes bibliográficos
Autor(a) principal: Abreu, P.
Data de Publicação: 2012
Outros Autores: Aglietta, M., Ahlers, M., Ahn, E. J., Albuquerque, Ivone Freire da Mota e, Allard, D., Allekotte, I., Allen, J., Pepe, Iuri Muniz
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/15603
Resumo: Texto completo: acesso restrito. p. 1-14
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spelling Abreu, P.Aglietta, M.Ahlers, M.Ahn, E. J.Albuquerque, Ivone Freire da Mota eAllard, D.Allekotte, I.Allen, J.Pepe, Iuri MunizAbreu, P.Aglietta, M.Ahlers, M.Ahn, E. J.Albuquerque, Ivone Freire da Mota eAllard, D.Allekotte, I.Allen, J.Pepe, Iuri Muniz2014-08-13T15:41:41Z20121475-7516http://repositorio.ufba.br/ri/handle/ri/15603Texto completo: acesso restrito. p. 1-14Observations 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 self-clustering 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.Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2014-08-13T15:41:41Z No. of bitstreams: 1 P. Abreu.pdf: 397455 bytes, checksum: f6cab009ae2da7c5b9b9863754ab8c8f (MD5)Made available in DSpace on 2014-08-13T15:41:41Z (GMT). No. of bitstreams: 1 P. Abreu.pdf: 397455 bytes, checksum: f6cab009ae2da7c5b9b9863754ab8c8f (MD5) Previous issue date: 2012http://dx.doi.org/ doi:10.1088/1475-7516/2012/04/040reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBACosmic ray experimentsUltra high energy cosmic raysA search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger ObservatoryJournal of Cosmology and Astroparticle Physicsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01info:eu-repo/semantics/openAccessengORIGINALP. Abreu.pdfP. Abreu.pdfapplication/pdf397455https://repositorio.ufba.br/bitstream/ri/15603/1/P.%20Abreu.pdff6cab009ae2da7c5b9b9863754ab8c8fMD51LICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/15603/2/license.txtff6eaa8b858ea317fded99f125f5fcd0MD52TEXTP. Abreu.pdf.txtP. 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dc.title.pt_BR.fl_str_mv A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
dc.title.alternative.pt_BR.fl_str_mv Journal of Cosmology and Astroparticle Physics
title A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
spellingShingle A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
Abreu, P.
Cosmic ray experiments
Ultra high energy cosmic rays
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 A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory
author Abreu, P.
author_facet Abreu, P.
Aglietta, M.
Ahlers, M.
Ahn, E. J.
Albuquerque, Ivone Freire da Mota e
Allard, D.
Allekotte, I.
Allen, J.
Pepe, Iuri Muniz
author_role author
author2 Aglietta, M.
Ahlers, M.
Ahn, E. J.
Albuquerque, Ivone Freire da Mota e
Allard, D.
Allekotte, I.
Allen, J.
Pepe, Iuri Muniz
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Abreu, P.
Aglietta, M.
Ahlers, M.
Ahn, E. J.
Albuquerque, Ivone Freire da Mota e
Allard, D.
Allekotte, I.
Allen, J.
Pepe, Iuri Muniz
Abreu, P.
Aglietta, M.
Ahlers, M.
Ahn, E. J.
Albuquerque, Ivone Freire da Mota e
Allard, D.
Allekotte, I.
Allen, J.
Pepe, Iuri Muniz
dc.subject.por.fl_str_mv Cosmic ray experiments
Ultra high energy cosmic rays
topic Cosmic ray experiments
Ultra high energy cosmic rays
description Texto completo: acesso restrito. p. 1-14
publishDate 2012
dc.date.issued.fl_str_mv 2012
dc.date.accessioned.fl_str_mv 2014-08-13T15:41:41Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.issn.none.fl_str_mv 1475-7516
identifier_str_mv 1475-7516
url http://repositorio.ufba.br/ri/handle/ri/15603
dc.language.iso.fl_str_mv eng
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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