Observations of "dents" in the Radio Shells of SNRs Expanding Into Dense Clouds

High resolution (≡36arcsec×90arcsec) radio maps of SNRs W28 and W44 observed with the OSRT at 327 MHz are presented. The distortions or dents in their shell structure are associated with the parts of the shells expanding into dense molecular clouds in their vicinity and provide direct observational evidence for interaction between them.