A high resolution UV absorption spectrum of supernova ejecta in SN1006

Abstract

We report a high resolution, far-ultraviolet, STIS E140M spectrum of the strong, broad Si II, III, and IV features produced by the ejecta of SN1006 seen in absorption against the background Schweizer-Middleditch star. The spectrum confirms the extreme sharpness of the red edge of the redshifted Si II 1260 A feature, supporting the idea that this edge represents the location of the reverse shock moving into the freely expanding ejecta. The expansion velocity of ejecta at the reverse shock is measured to be 7026 +-3(relative) +-10(absolute) km/s. If the shock model is correct, then the expansion velocity should be decreasing at the observable rate of 2.7 +-0.1 km/s per year. The pre-shock velocity, post-shock velocity, and post-shock velocity dispersion are all measured from the Si II 1260 A feature, and consistency of these velocities with the shock jump conditions implies that there is little or no electron heating in this fast (2680 km/s) Si-rich shock.

9 pages, 5 embedded postscript figs

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• The Density and Mass of Unshocked Ejecta in Cassiopeia A through Low Frequency Radio Absorption
• The kinematics and chemical stratification of the Type Ia supernova remnant 0519-69.0
• Three-dimensional numerical investigations of the morphology of type Ia SNRs
• An Integral View of Fast Shocks around Supernova 1006
• Subdwarf B stars as possible surviving companions in Type Ia supernova remnants
• Tycho-B: an unlikely companion for SN 1572
• XMM-Newton Large Program on SN1006 - I: Methods and Initial Results of Spatially-Resolved Spectroscopy
• The Effect of a Cosmic Ray Precursor in SN 1006?
• Electron Heating, Magnetic Field Amplification, and Cosmic Ray Precursor Length at Supernova Remnant Shocks
• Dynamics of X-Ray-Emitting Ejecta in the Oxygen-Rich Supernova Remnant Puppis A Revealed by the XMM-Newton RGS
• Time Evolution of the Reverse Shock in SN 1006
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