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We present a hard X-ray spectrum of unprecedented quality of the Galacticsupernova remnant W49B obtained with the Suzaku satellite. The spectrumexhibits an unusual structure consisting of a saw-edged bump above 8 keV. Thisbump cannot be explained by any combination of high-temperature plasmas inionization equilibrium. We firmly conclude that this bump is caused by thestrong radiative recombination continuum (RRC) of iron, detected for the firsttime in a supernova remnant. The electron temperature derived from thebremsstrahlung continuum shape and the slope of the RRC is 1.5 keV. On theother hand, the ionization temperature derived from the observed intensityratios between the RRC and K-alpha lines of iron is 2.7 keV. These resultsindicate that the plasma is in a highly overionized state. Volume emissionmeasures independently determined from the fluxes of the thermal and RRCcomponents are consistent with each other, suggesting the same origin of thesecomponents.

Suzaku Discovery of the Strong Radiative Recombination Continuum of Iron from the Supernova Remnant W49B