Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk11004s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present ultraviolet spectra, obtained with HUT and FUSE, of an optical filament on the eastern limb of the Vela SNR. The region bounds the bright X-ray feature called ``Knot D'', identified in the ROSAT All Sky Survey. Knot D protrudes beyond the nominal circumference of the remnant. The feature is either due to a fragment of ejecta that is pushing through the blast wave, or it is a ``break-out'' of the shell caused by inhomogeneities in the ambient medium. In either scenario, the optical filaments are due to radiative shocks being driven into an interstellar cloud by the pressure in Knot D\@. Several emission lines from various ionization states of of He, C, N, O, Ne, Si and S are seen in the far-ultraviolet spectra of the filament. Models indicate that a range of shock velocities are present: faster shocks (v_s ~150 km s-1) dominate the emission from high ionization species such as O VI, and slower shocks contribute to emission from the lower ionization species. The models also show that the elemental abundances are solar in the emitting region.
Blair William
Raymond John
Sankrit Ravi
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