We report re-analyses of the Suzaku observations of the Galactic supernova remnant ( SNR ) , G272.2 - 3.2 , for which the previous studies were limited below 3 keV .
With careful data reduction and background subtraction , we discover the K-shell lines of Ar , Ca , and Fe above 3 keV .
The X-ray spectrum of G272.2 - 3.2 consists of two components , a low-temperature collisional ionization equilibrium ( CIE ) plasma ( kT _ { e } \sim 0.2 keV ) and a high-temperature non-equilibrium ionization ( NEI ) plasma ( kT _ { e } = 0.6 – 3 keV ) .
The CIE plasma has solar abundances over the entire area , hence it would originate from the interstellar medium .
On the other hand , the abundances of the NEI plasma increase toward the inner region , suggesting the ejecta origin .
The line center energy of the Fe K-shell emission ( \sim 6.4 keV ) suggests that the ejecta are recently heated by the reverse shock , a common feature in Type Ia SNRs .