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Large Scale Distribution of Ultra High Energy Cosmic Rays Detected at the Pierre Auger Observatory With Zenith Angles up to 80°

2015-03-31Journal article Open access
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dc.contributor.authorPierre Auger collaboration (481 authors)
dc.contributor.authorAbreu, Pedro
dc.contributor.authorAndringa, Sofia
dc.contributor.authorAssis, Pedro
dc.contributor.authorBrogueira, Pedro
dc.contributor.authorCazon, Lorenzo
dc.contributor.authorConceição, Ruben
dc.contributor.authorDiogo, Francisco
dc.contributor.authorEspadanal, Joao
dc.contributor.authorGonçalves, Patrícia
dc.contributor.authorOliveira, Micael
dc.contributor.authorPimenta, Mário
dc.contributor.authorSanto, Catarina E
dc.contributor.authorSantos, Eva
dc.contributor.authorSarmento, Raul
dc.contributor.authorTomé, Bernardo
dc.date.accessioned2019-02-04T05:30:11Z
dc.date.available2019-02-04T05:30:11Z
dc.date.issued2015-03-31
dc.date.updated2019-02-04T05:30:11Z
dc.description.abstractWe present the results of an analysis of the large angular scale distribution of the arrival directions of cosmic rays with energy above 4 EeV detected at the Pierre Auger Observatory including for the first time events with zenith angle between 60° and 80°. We perform two Rayleigh analyses, one in the right ascension and one in the azimuth angle distributions, that are sensitive to modulations in right ascension and declination, respectively. The largest departure from isotropy appears in the $E\gt 8$ EeV energy bin, with an amplitude for the first harmonic in right ascension $r_{1}^{\alpha }=(4.4\pm 1.0)\times {{10}^{-2}}$, that has a chance probability $P(\geqslant r_{1}^{\alpha })=6.4\times {{10}^{-5}}$, reinforcing the hint previously reported with vertical events alone.
dc.description.versionPeer Reviewed
dc.identifierAstrophys.J. 802 (2015) 111; DOI 10.1088/0004-637X/802/2/111
dc.identifier.urihttp://dx.doi.org/10.1088/0004-637X/802/2/111
dc.identifier.urihttp://hdl.handle.net/10400.26/26734
dc.language.isoeng
dc.titleLarge Scale Distribution of Ultra High Energy Cosmic Rays Detected at the Pierre Auger Observatory With Zenith Angles up to 80°
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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