We calculated for the nearest active galactic nucleus ( AGN ) , Centaurus A ( Cen A ) , the flux of high energy cosmic rays and of accompanying secondary photons and neutrinos expected from hadronic interactions in the source .
We used as two basic models for the generation of ultrahigh energy cosmic rays ( UHECR ) shock acceleration in the radio jet and acceleration in the regular electromagnetic field close to the core of the AGN , normalizing the UHECR flux to the observations of the Auger experiment .
Here we compare the previously obtained photon fluxes with the recent data reported by the Fermi LAT and H.E.S.S .
collaborations .
In the case of the core model , we find good agreement both for the predicted spectral shape and the overall normalization between our earlier results and the H.E.S.S .
observations for a primary proton energy dN / dE \propto E ^ { - \alpha } with \alpha \sim 2 or smaller .
A broken-power law with high-energy part \alpha = -2.7 leads to photon fluxes in excess of the Fermi measurements .
The energy spectrum of the photon fluxes obtained by us for the jet scenario is in all cases at variance with the H.E.S.S .
and Fermi observations .