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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 | Affiliation: | Harvard-Smithsonian CfA), W.P. Blair (Johns Hopkins University), L.K. Townsley, and P.S. Broos (The Pennsylvania State University | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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