Far-UV Spectroscopy of an Optical Filament in Vela

Astronomy and Astrophysics – Astrophysics

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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.

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