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The closest radio galaxies; Centaurus A, M87 and NGC 1275, have been detectedfrom radio wavelengths to TeV $\gamma$-rays, and also studied as high-energyneutrino and ultra-high-energy cosmic ray potential emitters. Their spectralenergy distributions show a double-peak feature, which is explained bysynchrotron self-Compton model. However, TeV $\gamma$-ray measured spectracould suggest that very-high-energy $\gamma$-rays might have a hadronic origin.We introduce a lepto-hadronic model to describe the broadband spectral energydistribution; from radio to sub GeV photons as synchrotron self-Comptonemission and TeV $\gamma$-ray photons as neutral pion decay resulting fromp$\gamma$ interactions occurring close to the core. These photo-hadronicinteractions take place when Fermi-accelerated protons interact with the seedphotons around synchrotron self-Compton peaks. Obtaining a good description ofthe TeV $\gamma$-ray fluxes, firstly, we compute neutrino fluxes and eventsexpected in IceCube detector and secondly, we estimate ultra-high-energy cosmicray fluxes and event rate expected in Telescope Array, Pierre Auger and HiResobservatories. Within this scenario we show that the expected high-energyneutrinos cannot explain the astrophysical flux observed by IceCube, and theconnection with ultra-high-energy cosmic rays observed by Auger experimentaround Centaurus A, might be possible only considering a heavy nucleicomposition in the observed events.

Neutrino, $\gamma$-ray and cosmic ray fluxes from the core of the closest radio galaxies