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We present deep observations of the Galactic supernova remnant IC 443 withthe {\it Suzaku X-ray satellite}. We find prominent K-shell lines from iron andnickel, together with a triangle residual at 8--10~keV, which corresponds tothe energy of the radiative recombination continuum (RRC) of He-like iron. Inaddition, the wavy residuals have been seen at $\sim$5.1 and $\sim$5.5~keV. Weconfirm that the residuals show the first enhanced RRCs of He- and H-likecalcium found in supernova remnants. These facts provide robust evidence forthe recombining plasma. We reproduce the plasma in the 3.7--10~keV band using arecombining plasma model at the electron temperature 0.65~keV. Therecombination parameter $n_{\rm e}t$ ($n_{\rm e}$ is electron density and $t$is elapsed time after formation of a recombining plasma) and abundances of ironand nickel are strongly correlated, and hence the errors are large. On theother hand, the ratio of nickel to iron relative to the solar abundances iswell constrained to 11$^{+4}_{-3}$ (1$\sigma$). A possibility is that the largeabundance ratio is a result of an asymmetric explosion of the progenitor star.

Discovery of Enhanced Radiative Recombination Continua of He-like Iron and Calcium from IC 443 and Its Implications