Astronomical observations through the new 100 TeV gamma-ray observational window by HAWC, Tibet and LHAASO air shower arrays, and, in the near future, by the Cherenkov Telescope Array CTA open a range of completely new possibilities for the study of highest energy galactic cosmic ray sources. These sources, dubbed "PeVatrons" (yet to be identified) produce particles with energies in expar Dmitri Semikoz - Thèses hors de l'EDPIF