The Fe XXV forbidden-to-resonance ratio in Sgr A East is 1.39 ± 0.12, showing overionized plasma with initial ionization temperature above 4 keV and recombination timescale below 8 × 10^11 cm^-3 s.
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Overionized plasma in the supernova remnant Sagittarius A East anchored by XRISM observations
The Fe XXV forbidden-to-resonance ratio in Sgr A East is 1.39 ± 0.12, showing overionized plasma with initial ionization temperature above 4 keV and recombination timescale below 8 × 10^11 cm^-3 s.