Search for PeVatrons in VHE gamma rays and neutrinos

Since its discovery more than one hundred years ago, the origin of the cosmic-ray (CR) flux measured on Earth is still unknown: in order to explain the region below the knee, supernova remnants (SNRs) are usually addressed as PeV cosmic accelerators. In particular, young SNRs are potential candidates since they might act as PeVatrons at least during the initial stage of their evolution. However, no clear indication of PeV energies has been observed so far in such a kind of sources, including the brightest TeV SNR, RX J1713-3946.7. Recently, the Galactic Center region has been detected as a very-high-energy (VHE) gamma-ray emitter. Two emission regions have been resolved by H.E.S.S.: a point source, spatially associated to the known radio source SgrA, and a diffuse flux, characterised by a simple power law gamma-ray spectrum with no visible cut-off up to gamma-ray energies of about 35 TeV. Such a detection triggers the search for PeVatron at the center of our Galaxy. A clear evidence of the hadronic nature of the emission would be the detection of a neutrino counterpart. I will here discuss the potentials of the next generation neutrino telescopes.