Speaker
Dr
Olivier Deligny
(Institut de Physique Nucléaire Orsay)
Description
Scrutiny of the large scale distribution of arrival directions of cosmic
rays with energies above ~100 PeV is one important observable to provide
key elements for understanding the end of Galactic cosmic rays, and for
establishing at which energy the flux of extragalactic cosmic rays starts
to dominate the cosmic ray energy spectrum. Using the large amount of
data collected by the Pierre Auger Observatory, upper limits on the
dipole component in the equatorial plane obtained in different energy
ranges above ~100 PeV are presented, being below 2% at 99% CL for EeV
energies. Even though the measured amplitudes are within the statistical
fluctuations, an apparent consistency of the phases in adjacent energy
bins is observed and discussed.
