IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory
Autor/es:
THE PIERRE AUGER COLLABORATION; THE PIERRE AUGER COLLABORATION; ANDRADA, B.; ANDRADA, B.
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2018 vol. 868 p. 1 - 12
ISSN:
0004-637X
Resumen:
We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4EeV measured using thePierre Auger Observatory. For the energy bins [4, 8]EeV and E>=8 EeV, the most significant signal is a dipolar modulation in R.A. at energies above 8EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4EeV. The growth can be fitted with a power law with index β=0.79±0.19. The directions of the dipoles are consistent withan extragalactic origin of these anisotropies at all the energies considered. Additionally, we have estimated thequadrupolar components of the anisotropy: they are not statistically significant. We discuss the results in the context of the predictions from different models for the distribution of ultrahigh-energy sources and cosmic magnetic fields.