Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger pbservatory.
AAB, A.; ALBUQUERQUE, Ivone Freire da Mota e; CATALANI, F.; SOUZA, Vitor de; KEMMERICH, N.; LANG, R. G.; PRADO, R. R.; CARVALHO, W. Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.
AAB, A.; ALBUQUERQUE, Ivone Freire da Mota e; CATALANI, F.; SOUZA, Vitor de; KEMMERICH, N.; LANG, R. G.; PRADO, R. R.; CARVALHO, W. Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.
 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 = 8 EeV, the most significant signal is a dipolar modulation in R.A. 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 ß = 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. | |
| Astrophysical Journal |
| v. 868, n. 1, p. 4-1-4-12 - Ano: 2018 |
| Fator de Impacto: 5,551 |
| http://dx.doi.org/10.3847/1538-4357/aae689 |  @article={002914377,author = {AAB, A.; ALBUQUERQUE, Ivone Freire da Mota e; CATALANI, F.; SOUZA, Vitor de; KEMMERICH, N.; LANG, R. G.; PRADO, R. R.; CARVALHO, W. Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.},title={Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger pbservatory},journal={Astrophysical Journal},note={v. 868, n. 1, p. 4-1-4-12},year={2018}} |