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We present the Suzaku spectroscopic study of the Galactic middle-agedsupernova remnant (SNR) IC 443. The X-ray spectrum in the 1.75-6.0 keV band isdescribed by an optically-thin thermal plasma with the electron temperature of0.6 keV and several additional Lyman lines. We robustly detect, for the firsttime, strong radiative recombination continua (RRC) of H-like Si and S aroundat 2.7 and 3.5 keV. The ionization temperatures of Si and S determined from theintensity ratios of the RRC to He-like K-alpha line are 1.0 keV and 1.2 keV,respectively. We thus find firm evidence for an extremely-overionized(recombining) plasma. As the origin of the overionization, a thermal conductionscenario argued in previous work is not favored in our new results. We proposethat the highly-ionized gas were made at the initial phase of the SNR evolutionin dense regions around a massive progenitor, and the low electron temperatureis due to a rapid cooling by an adiabatic expansion.

Discovery of Strong Radiative Recombination Continua from The Supernova Remnant IC 443 with Suzaku