Articulo
Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory
Autor
Badagnani, Daniel Omar
Dova, María Teresa
Epele, Luis Nicolás
Gómez Albarracín, Flavia Alejandra
Grunfeld, Christian Martín
Manceñido, Mónica E.
Martínez, Norberto Horacio
Sciutto, Sergio Juan
Tueros, Matías Jorge
Veiga, Alejandro Luis
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
Institución
Resumen
Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this part of the sky is already significantly larger than that of the fore-runner experiments. Our results do not support previous findings of localized excesses in the AGASA and SUGAR data. We set an upper bound on a pointlike flux of cosmic rays arriving from the Galactic Centre which excludes several scenarios predicting sources of EeV neutrons from Sagittarius A. Also the events detected simultaneously by the surface and fluorescence detectors (the ‘hybrid’ data set), which have better pointing accuracy but are less numerous than those of the surface array alone, do not show any significant localized excess from this direction. Facultad de Ciencias Exactas