Astronomy of ultra-high energy neutral particles with the Pierre Auger Observatory

The Pierre Auger Observatory is a hybrid detector of Ultra High Energy Cosmic Rays (UHECRs) especially suitable for primary energies above 1018 eV. Auger is also sensitive to primary neutral particles, namely photons, neutrinos and neutrons. Neutral cosmic rays propagate along a straight line and are not deflected by magnetic fields, in contrast to charged cosmic rays. This opens the possibility of doing "astronomy" by directional pointing. The most accepted astrophysical models predict the production of neutral particles both in their sources or in physical processes during the propagation of charged particles. We perform independent analyses for different types of neutral particles. No significant evidence of the presence of these particles has been observed in data collected from 2004 up to now; therefore we present upper bounds to their fluxes.