Publication
Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory
| dc.contributor.author | Pierre Auger collaboration (376 authors) | |
| dc.contributor.author | Abreu, Pedro | |
| dc.contributor.author | Andringa, Sofia | |
| dc.contributor.author | Assis, Pedro | |
| dc.contributor.author | Barreira Luz, Ricardo Jorge | |
| dc.contributor.author | Blanco, Alberto | |
| dc.contributor.author | Cazon, Lorenzo | |
| dc.contributor.author | Conceição, Ruben | |
| dc.contributor.author | Diogo, Francisco | |
| dc.contributor.author | Lopes, Luis | |
| dc.contributor.author | Pimenta, Mário | |
| dc.contributor.author | Riehn, Felix | |
| dc.contributor.author | Santos, Eva | |
| dc.contributor.author | Sarmento, Raul | |
| dc.contributor.author | Tomé, Bernardo | |
| dc.date.accessioned | 2019-02-05T16:51:21Z | |
| dc.date.available | 2019-02-05T16:51:21Z | |
| dc.date.issued | 2018-11-13 | |
| dc.date.updated | 2019-02-05T16:51:21Z | |
| dc.description.abstract | We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4,8] EeV and $E\geq 8$ EeV, the most significant signal is a dipolar modulation in right ascension at energies above 8 EeV, 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 4 EeV. The growth can be fitted with a power law with index $\beta=0.79\pm 0.19$. The directions of the dipoles are consistent with an extragalactic origin of these anisotropies at all the energies considered. Additionally we have estimated the quadrupolar 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. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Astrophys.J. 868 (2018) 4; DOI 10.3847/1538-4357/aae689 | |
| dc.identifier.uri | http://dx.doi.org/10.3847/1538-4357/aae689 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/27708 | |
| dc.language.iso | eng | |
| dc.title | Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |