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We present an X-ray imaging and spectroscopic study of the molecular cloudinteracting mixed-morphology (MM) supernova remnant (SNR) G346.6-0.2 usingXMM-Newton. The X-ray spectrum of the remnant is well described by arecombining plasma that most likely arises from adiabatic cooling, and hassub-solar abundances of Mg, Si, and S. Our fits also suggest the presence ofeither an additional power-law component with a photon index of $\sim$2, or anadditional thermal component with a temperature of $\sim$2.0 keV. Weinvestigate the possible origin of this component and suggest that it couldarise from either the Galactic ridge X-ray emission, an unidentified pulsarwind nebula or X-ray synchrotron emission from high-energy particlesaccelerated at the shock. However, deeper, high resolution observations of thisobject are needed to shed light on the presence and origin of this feature.Based on its morphology, its Galactic latitude, the density of the surroundingenvironment and its association with a dense molecular cloud, G346.6-0.2 mostlikely arises from a massive progenitor that underwent core-collapse.

An XMM-Newton Study of the Mixed-Morphology Supernova Remnant G346.6-0.2