Observations Of Supernova Remnants And Molecular Clouds: Bridging Low And High Energy Cosmic Rays

New evidence that galactic cosmic rays (GCR: here protons and nuclei) are accelerated by supernova remnant (SNR) shocks has come from recent works combining-y-ray observations in the sub-GeV to TeV domain, and in the submm-mm domain. The results show an enhanced CR flux in regions of massive star formation in which SNRs interact with molecular cloud complexes. Such regions are thus ideal laboratories to study in situ CR acceleration by SNR shocks, and diffusion processes in their vicinity.