Articulo
Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
Registro en:
issn:1538-4357
issn:0004-637X
Autor
Calcagni, Laura Randa
Dova, María Teresa
Hansen, Patricia María
Mariazzi, Analisa Gabriela
Sciutto, Sergio Juan
Tueros, Matías Jorge
Vergara Quispe, Indira Dajhana
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
Institución
Resumen
We present measurements of the large-scale cosmic-ray anisotropies in right ascension, using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 years. We determine the equatorial dipole component, ~d⊥, through a Fourier analysis in right ascension that includes weights for each event so as to account for the main detector-induced systematic effects. For the energies at which the trigger efficiency of the array is small, the “East-West” method is employed. Besides using the data from the array with detectors separated by 1500 m, we also include data from the smaller but denser sub-array of detectors with 750 m separation, which allows us to extend the analysis down to ∼ 0.03 EeV. The most significant equatorial dipole amplitude obtained is that in the cumulative bin above 8 EeV, d⊥ = 6.0 +1.0 −0.9%, which is inconsistent with isotropy at the 6σ level. In the bins below 8 EeV, we obtain 99% CL upper-bounds on d⊥ at the level of 1 to 3 percent. At energies below 1 EeV, even though the amplitudes are not significant, the phases determined in most of the bins are not far from the right ascension of the Galactic center, at αGC = −94◦ , suggesting a predominantly Galactic origin for anisotropies at these energies. The reconstructed dipole phases in the energy bins above 4 EeV point instead to right ascensions that are almost opposite to the Galactic center one, indicative of an extragalactic cosmic ray origin. La lista completa de autores puede verse en el archivo asociado. Instituto de Física La Plata