We present our 12CO and 13CO mapping observations of SNR IC 443 interacting with molecular clouds.It is the first largescale high-resolution 13CO mapping observation in the surrounding region.The morphologies of IC 443 in 12CO and 13 CO are compared with the optical,infrared,Spitzer far-infrared,X-ray,and neutral atomic gas(HI).We also make comparison and analysis in the kinematics,using the date-cubes of 12CO,13CO and HI,to help distinguish the complicated gas motions in the shocked regions.Based on the work of Wang & Scoville(1992),we present a new model to explain the coexistence of multiple shocks with different speeds in a pc-scale region at the central clump B.We test this new model by analyzing the HI and CO distribution in both velocity and space domain.We also establish the relationship between the dissociation rate of shocked molecular gas and the shock velocity in this region.Finally,we derive the optical depth of 12CO with the 13CO spectra in clump B,and discuss the validity of the assumption of optically thin emission for the shocked 12CO.
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