期刊
ASTROPHYSICAL JOURNAL
卷 714, 期 2, 页码 1725-1732出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/714/2/1725
关键词
ISM: abundances; ISM: individual objects (Puppis A); ISM: supernova remnants; X-rays: ISM
资金
- JSPS
- NASA [NNG06EO90A]
We report on the discovery of X-ray-emitting O-Ne-Mg-rich ejecta in the middle-aged Galactic O-rich supernova remnant Puppis A with Chandra and XMM-Newton. We use line ratios to identify a low-ionization filament running parallel to the northeastern edge of the remnant that requires super-solar abundances, particularly for O, Ne, and Mg, which we interpret to be from O-Ne-Mg-rich ejecta. Abundance ratios of Ne/O, Mg/O, and Fe/O are measured to be similar to 2, similar to 2, and < 0.3 times the solar values. Our spatially resolved spectral analysis from the northeastern rim to the western rim otherwise reveals sub-solar abundances consistent with those in the interstellar medium. The filament is coincident with several optically emitting O-rich knots with high velocities. If these are physically related, the filament would be a peculiar fragment of ejecta. On the other hand, the morphology of the filament suggests that it may trace ejecta heated by a shock reflected strongly off the dense ambient clouds near the northeastern rim.
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