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We report on results of imaging and spectral analysis of the supernovaremnant (SNR) RCW 86 observed with Suzaku. The SNR is known to exhibit K-shellemission of low ionized Fe, possibly originating from supernova ejecta. Werevealed the global distribution of the Fe-rich plasma in the entire remnant,for the first time; the Fe-K emission was clearly detected from the west,north, and south regions, in addition to the X-ray brighter shells of southwestand northeast, where the presence of the Fe-rich ejecta has already beenreported. The spectrum of each region is well represented by a three-componentmodel consisting of low- and high-temperature thermal plasmas and a non-thermalemission. The lower-temperature component, with elemental abundances of nearthe solar values, likely originates from the forward shocked interstellarmedium, while the Fe-rich ejecta is described by the hotter plasma. From themorphologies of the forward and reverse shocks in the west region, the totalejecta mass is estimated to be 1-2M_sun for the typical explosion energy of ~ 1x 10^{51} erg. The integrated flux of the Fe-K emission from the entire SNRroughly corresponds to a total Fe mass of about 1M_sun. Both of these estimatessuggest a Type Ia supernova origin of this SNR. We also find possible evidenceof an Fe-rich clump located beyond the forward-shock front in the north rim,which is reminiscent of ejecta knots observed in the Tycho and Vela SNRs.

Suzaku View of the Supernova Remnant RCW 86: X-Ray Studies of Newly-Discovered Fe-Rich Ejecta