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The nature of the extended hard X-ray source XMMU J061804.3+222732 and itssurroundings is investigated using XMM-Newton, Chandra, and Spitzerobservations. This source is located in an interaction region of the IC 443supernova remnant with a neighboring molecular cloud. The X-ray emissionconsists of a number of bright clumps embedded in an extended structurednon-thermal X-ray nebula larger than 30" in size. Some clumps show evidence forline emission at ~1.9 keV and ~3.7 keV at the 99% confidence level. Large-scalediffuse radio emission of IC 443 passes over the source region, with anenhancement near the source. An IR source of about 14" x 7" size is prominentin the 24 um, 70 um, and 2.2 um bands, adjacent to a putative Si K-shell X-rayline emission region. The observed IR/X-ray morphology and spectra areconsistent with those expected for J/C-type shocks of different velocitiesdriven by fragmented supernova ejecta colliding with the dense medium of amolecular cloud. The IR emission of the source detected by Spitzer can beattributed to both continuum emission from an HII region created by the ejectafragment and line emission excited by shocks. This source region in IC 443 maybe an example of a rather numerous population of hard X-ray/IR sources createdby supernova explosions in the dense environment of star-forming regions.Alternative Galactic and extragalactic interpretations of the observed sourceare also discussed.

Isolated X-ray -- infrared sources in the region of interaction of the supernova remnant IC 443 with a molecular cloud