A reanalysis of Suzaku data on W49B shows the reported Fe XXV charge exchange signal is explained by missing high-shell dielectronic recombination satellite lines, leaving no robust CX detection.
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Revisiting the Suzaku spectrum of the Galactic SNR W 49 B: non-detection of iron K-shell charge exchange emission and refined ejecta mass ratios of iron-group elements
A reanalysis of Suzaku data on W49B shows the reported Fe XXV charge exchange signal is explained by missing high-shell dielectronic recombination satellite lines, leaving no robust CX detection.