INVESTIGADORES
MARIAZZI Analisa Gabriela
artículos
Título:
Constraints on the origin of cosmic rays above 10^18 eV from large scale anisotropy searches in data of the Pierre Auger observatory
Autor/es:
PIERRE AUGER COLLABORATION (J. ABRAHAM, ... , A. MARIAZZI, ET AL)
Revista:
The Astrophysical Journal Letters
Editorial:
The american astronomical society
Referencias:
Año: 2013 vol. 762 p. 1 - 8
ISSN:
2041-8205
Resumen:
A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detectedabove 1018 eV at the Pierre Auger Observatory is reported. For the first time, these large-scale anisotropy searchesare performed as a function of both the right ascension and the declination and expressed in terms of dipole andquadrupole moments.Within the systematic uncertainties, no significant deviation from isotropy is revealed. Upperlimits on dipole and quadrupole amplitudes are derived under the hypothesis that any cosmic ray anisotropy isdominated by such moments in this energy range. These upper limits provide constraints on the production ofcosmic rays above 1018 eV, since they allow us to challenge an origin from stationary galactic sources denselydistributed in the galactic disk and emitting predominantly light particles in all directions.
