ar X iv : 0 80 4 . 30 17 v 1 [ as tr o - ph ] 1 8 A pr 2 00 8 Gamma Rays from Centaurus A

Centaurus A, the cosmic ray accelerator a few Mpc away from us is one of the nearest sources of extremely high energy cosmic rays. It would be interesting to see whether the gamma ray data currently available from Centaurus A in the GeV-TeV energy band can be explained with only proton proton interactions. We show that to be consistent with the gamma ray luminosity observed in the GeV-TeV energy range and the correlated extreme energy cosmic ray events observed by the Pierre Auger experiment, mechanisms of γ-ray production other than proton proton interactions are needed inside this radio-galaxy. keywords: ultra high energy cosmic rays, ultra high energy photons and neutrinos Gamma Rays from Centaurus A 2