Journal
ASTROPHYSICAL JOURNAL
Volume 756, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/756/1/49
Keywords
atomic processes; ISM: abundances; ISM: individual objects (Puppis A); ISM: supernova remnants; X-rays: ISM
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology [23000004]
- Special Postdoctoral Researchers Program in RIKEN
- Grants-in-Aid for Scientific Research [23000004, 24740167] Funding Source: KAKEN
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We present high-resolution X-ray spectra of cloud-shock interaction regions in the eastern and northern rims of the Galactic supernova remnant Puppis A, using the Reflection Grating Spectrometer on board the XMM-Newton satellite. A number of emission lines including K alpha triplets of He-like N, O, and Ne are clearly resolved for the first time. Intensity ratios of forbidden to resonance lines in the triplets are found to be higher than predictions by thermal emission models having plausible plasma parameters. The anomalous line ratios cannot be reproduced by effects of resonance scattering, recombination, or inner-shell ionization processes, but could be explained by charge-exchange emission that should arise at interfaces between the cold/warm clouds and the hot plasma. Our observations thus provide observational support for charge-exchange X-ray emission in supernova remnants.
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