Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory
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 ≥ 8 EeV, the most significant signal is a dipolar modulation in right ascension at energies above 8 EeV, as previously...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Argentina |
| Institución: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/125623 |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/125623 |
| Access Level: | acceso abierto |
| Palabra clave: | Física Cosmic ray Physics Dipole Amplitude Pierre auger observatory Context (language use) Astrophysics Cosmic cancer database Right ascension Anisotropy Observatory Auger Astroparticle physics |
| Sumario: | 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 ≥ 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 β=0.79 ± 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. |
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