Gamma-ray observations of Supernova Remnants with Fermi-LAT data

After 8 years of data taking, the Large Area Telescope (LAT) onboard the Fermi satellite has shown an excellent capability to detect and observe Supernova Remnants (SNRs) from few hundred MeV up to few hundred GeV. It provides crucial information on physical processes happening at the source, involving both accelerated leptons and hadrons, in order to understand the mechanisms responsible for the acceleration of primary Cosmic Rays. We interpreted the multiwavelength Spectral Energy Distribution (SED) of a sample of different types of SNRs, which have been observed by the Fermi-LAT. We show how the environment in which the supernova shock is propagating affects the interpretation of its SED. We evaluated the spectral features of the accelerated particle spectra and estimated the acceleration efficiency, as well as the maximum energy of accelerated particles.