A Chandra observation of the isolated hard X-ray source XMMU J061804.3+222732 , located in the region of apparent interaction of the supernova remnant IC 443 with a molecular cloud , resolved the complex structure of the source in a few bright clumps embedded in an extended emission of a \sim 30 ^ { \prime \prime } size .
The X-ray spectra of the clumps and the extended emission are dominated by a hard power-law component with a photon index of 1.2–1.4 .
In addition , we see some indications of an optically thin thermal plasma of a \sim 0.3 keV temperature .
The observed X-ray morphology and spectra are consistent with those expected for an isolated supernova ejecta fragment interacting with a dense ambient medium .
A possible alternative interpretation is a pulsar wind nebula associated with either IC 443 or another SNR , G189.6+3.3 .