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29 March 2024
 
  » arxiv » astro-ph/0112287

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Chandra Observations of the Eastern Limb of the Vela Supernova Remnant
P.P. Plucinsky ; R.K Smith ; R.J. Edgar ; T.J. Gaetz ; P.O. Slane ; W.P. Blair ; L.K. Townsley ; P.S. Broos ;
Date 12 Dec 2001
Subject astro-ph
AffiliationHarvard-Smithsonian CfA), W.P. Blair (Johns Hopkins University), L.K. Townsley, and P.S. Broos (The Pennsylvania State University
AbstractWe present results from two Chandra/ACIS observations of the so-called Vela ``Bullet D’’ region on the eastern limb of the Vela supernova remnant. The Bullet D region is a bright X-ray feature, identified by Aschenbach et al. (1995) from the ROSAT All-Sky Survey, which protrudes beyond the blast wave on the eastern side of the remnant. It has been suggested that this feature is a fragment of supernova ejecta which is just now pushing beyond the position of the main blast wave. An alternate explanation is that the feature is a ``break-out’’ of the shock in which inhomogeneities in the ambient medium cause the shock to be non-spherical. The Chandra image shows a fragmented, filamentary morphology within this region. The Chandra spectra show strong emission lines of O, Ne, and Mg. Equilibrium ionization models indicate that the O and Ne abundances are significantly enhanced compared to solar values. However, non-equilibrium ionization models can fit the data with solar O abundances and Ne abundances enhanced by only a factor of two. The Chandra data are more consistent with the shock breakout hypothesis, although they cannot exclude the fragment of ejecta hypothesis.
Source arXiv, astro-ph/0112287
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