HIGH-RESOLUTION X-RAY SPECTROSCOPY OF THE GALACTIC SUPERNOVA REMNANT PUPPIS A WITH XMM-NEWTON /RGS

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...

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Bibliographic Details
Published in:The Astrophysical journal 2012-09, Vol.756 (1), p.1-7
Main Authors: Katsuda, Satoru, Tsunemi, Hiroshi, Mori, Koji, Uchida, Hiroyuki, Petre, Robert, Yamada, Shin'ya, Akamatsu, Hiroki, KONAMI, SAORI, Tamagawa, Toru
Format: Article
Language:English
Subjects:
Clouds
Emission
Ionization
Mathematical models
Spectrometers
Supernova remnants
X-rays
XMM (spacecraft)
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Summary: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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/756/1/49