Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-07
Astron.Astrophys. 406 (2003) 141-148
Astronomy and Astrophysics
Astrophysics
8 pages, 8 figures, 2 tables, accepted by A&A
Scientific paper
10.1051/0004-6361:20030658
The X-ray emission from the supernova remnant DEM L 71 is measured and analysed using the high-resolution cameras and spectrometers on board XMM-Newton. The spectrum from the outer shell is reproduced very well by two plasma components of kT = 0.3 and 0.8 keV. The abundance value from this shell is consistent with the average LMC values. More extreme temperature variations are possibly indicated by spatial variations in the O VII forbidden/resonance line ratio, which could imply that in some regions the plasma is cooling dramatically and recombining. However, an alternative and equally interesting possibility is that the variation in forbidden/resonance ratios is due to resonant scattering, which would reduce resonance line emission along lines of sight with a high O VII column density. The inner region is hotter (kT = 1.1 keV) and shows enhanced Fe and Si abundances. We estimate the Fe and Si ejecta mass to be 0.7-1.1 M_sun and 0.1--0.15 M_sun, respectively. The morphology, mass estimates and abundances strongly suggest that DEM L 71 is the result of a type Ia explosion, as indicated by previous measurements.
Bleeker Johan A. M.
Kaastra Jelle S.
van der Heyden K. J.
Vink Jacco
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