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Type: Journal article
Title: Constraints on the origin of cosmic rays above 10¹⁸ eV from large-scale anisotropy searches in data of the Pierre Auger Observatory
Other Titles: Constraints on the origin of cosmic rays above 10(18) eV from large-scale anisotropy searches in data of the Pierre Auger Observatory
Author: Barber, K.
Bellido Caceres, J.
Clay, R.
Cooper, M.
Dawson, B.
Harrison, T.
Herve, A.
Hill, G.
Holmes, V.
Sorokin, J.
Wahrlich, P.
Whelan, B.
Citation: Letters of the Astrophysical Journal, 2013; 762(1):L13-1-L13-8
Publisher: Institute of Physics Publishing
Issue Date: 2013
ISSN: 2041-8205
Statement of
The Pierre Auger Collaboration, P. Abreu ... K. B. Barber ... J. A. Bellido ... R. W. Clay ... M. J. Cooper ... B. R. Dawson ... T. A. Harrison ... A. E. Herve, G. C. Hill ... V. C. Holmes ... J. Sorokin ... P. Wahrlich ... B. J. Whelan ... et al.
Abstract: A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 10¹⁸ eV at the Pierre Auger Observatory is reported. For the first time, these large-scale anisotropy searches are performed as a function of both the right ascension and the declination and expressed in terms of dipole and quadrupole moments. Within the systematic uncertainties, no significant deviation from isotropy is revealed. Upper limits on dipole and quadrupole amplitudes are derived under the hypothesis that any cosmic ray anisotropy is dominated by such moments in this energy range. These upper limits provide constraints on the production of cosmic rays above 10¹⁸ eV, since they allow us to challenge an origin from stationary galactic sources densely distributed in the galactic disk and emitting predominantly light particles in all directions.
Keywords: astroparticle physics
cosmic rays
Rights: © 2013. The American Astronomical Society. All rights reserved.
DOI: 10.1088/2041-8205/762/1/L13
Grant ID: ARC
Appears in Collections:Aurora harvest 4
IPAS publications

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