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The Pierre Auger Observatory has associated a few ultra high energy cosmicrays with the direction of Centaurus A. This source has been deeply studied inradio, infrared, X-ray and $\gamma$-rays (MeV-TeV) because it is the nearestradio-loud active galactic nuclei.  Its spectral energy distribution or spectrum shows two main peaks, the lowenergy peak, at an energy of $10^{-2}$ eV, and the high energy peak, at about150 keV.  There is also a faint very high energy (E $\geq$ 100 GeV) $\gamma$-rayemission fully detected by the High Energy Stereoscopic System experiment. Inthis work we describe the entire spectrum, the two main peaks with aSynchrotron/Self-Synchrotron Compton model and, the Very High Energy emissionwith a hadronic model. We consider p$\gamma$ and $pp$ interactions. For thep$\gamma$ interaction, we assume that the target photons are those produced at150 keV in the leptonic processes. On the other hand, for the pp interaction weconsider as targets the thermal particle densities in the lobes. Requiring asatisfactory description of the spectra at very high energies with p$\gamma$interaction we obtain an excessive luminosity in ultra high energy cosmic rays(even exceeding the Eddington luminosity). However, when considering ppinteraction to describe the $\gamma$-spectrum, the obtained number of ultrahigh energy cosmic rays are in agreement with Pierre Auger observations.Moreover, we calculate the possible neutrino signal from pp interactions on aKm$^3 $ neutrino telescope using Monte Carlo simulations.

How many Ultra High Energy Cosmic Rays could we expect from Centaurus A?