Vela X: A plerion or part of a shell?

Details Vela X: A plerion or part of a shell? Vela X: A plerion or part of a shell?

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..144g&link_type=abstract

Astronomy Letters, Volume 24, Issue 2, March 1998, pp.144-152; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 178

Astronomy and Astrophysics

Astronomy

8

Scientific paper

An analysis of the radio, optical, and X-ray observations of the supernova remnant (SNR) in Vela has led us to conclude that the radio source Vela X is part of the SNR shell. The high brightness of this radio source is assumed to be a result of the interaction of dome-shaped deformations (bubbles) on the SNR shell, which gives rise to bright radio filaments. The deformations could be produced by Richtmaier-Meshkov's instability, which develops during the impulsive acceleration of a shell of gas (swept up from the interstellar medium by the wind from a presupernova) by a shock wave (generated by a supernova explosion). The brightest radio filament and the X-ray jet extending along it are shown to be located in the region of interaction of two prominent bubbles on the SNR shell. We conclude that the X-ray jet, like Vela X, is part of the shell, and that it has its origin in the Mach reflection of two semispherical shock waves. Our estimate of the plasma temperature behind the front of the Mach wave matches the jet temperature. We also show that the large spread in the estimates of the spectral index for Vela X could be caused by the instrumental effect which arises during observations of extended radio sources with a nonuniform surface-brightness distribution.

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