Dr Dale Frail
I will review the class of galactic supernova remnants which show strong interactions with molecular clouds, revealed either through shock-excited masers or dense gas tracers. These remnants are preferentially found among the known GeV and TeV detections of supernova remnants. It has been argued that the masers and dense gas trace out the sites of hadronic particle acceleration. I will review what we know about the physical conditions of these shocked regions and I will introduce a potential new tracer for identifying the sites of cosmic ray acceleration.