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Description
IC 443 is a middle-aged SNR whose age, however, is estimated with high uncertainty to be from 3 to 30 10 3 years. IC 443 shows signs of interaction of SNR shells with surrounding molecular clouds and may also be overlapping with the older SNR G189+3.3. IC 443 has been intensively studied through multiwavelength observations in radio, X-rays, and MeV-TeV energy ranges, which aimed to reveal the explosion footprints and interactions with the surrounding medium. The IC 443 remnant exhibits a complex double-shell structure viewed in both optical wavelengths and non-thermal radio emission. While in the X-rays, IC 443 is characterized mostly by thermal emission, and there is no evidence of limb-brightened shells. The extended gamma-ray emission of 100 MeV–1 TeV within the radio shells was detected with the Fermi-LAT. The SHALON telescopes discovered extended emission from IC 443 at the energy range 800 GeV – 20 TeV, with the main contribution to the very-high-energy γ-ray fluxes given by the regions correlated with the East and North- East parts of the shell. The contribution of the East part of the IC 443 shell detected at TeV energies may correlate with the source of emission detected at 1 – 30 TeV by LHAASO, as well as the characteristics of the overall extended emission are consistent with those detected by HAWC and LHAASO experiments. The shape of the MeV to 100 TeV spectrum of gamma-rays from the complex structures of IC 443 is evidence of hadronic CR acceleration in the shocks of the investigated supernova remnant.