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Recent developments on the study of mixed morphology supernova remnants(MMSNRs) have revealed the presence of metal rich X-ray emitting plasma insidea fraction of these remnant, a feature not properly addressed by traditionalmodels for these objects. Radial profiles of thermodynamical and chemicalparameters are needed for a fruitful comparison of data and model of MMSNRs,but these are available only in a few cases. We analyze XMM-Newton data of twoMMSNRs, namely IC443 and G166.0+4.3, previously known to have solar metalabundances, and we perform spatially resolved spectral analysis of the X-rayemission. We detected enhanced abundances of Ne, Mg and Si in the hard X-raybright peak in the north of IC443, and of S in the outer regions of G166.0+4.3.The metal abundances are not distributed uniformly in both remnants. Theevaporating clouds model and the radiative SNR model fail to reproduceconsistently all the observational results. We suggest that further deep X-rayobservations of MMSNRs may reveal more metal rich objects. More detailed modelswhich include ISM-ejecta mixing are needed to explain the nature of thisgrowing subclass of MMSNRs.

On the metal abundances inside mixed-morphology supernova remnants: the case of IC443 and G166.0+4.3