Abstract
The supernova remnant 0540-69.3 in the Large Magellanic Cloud has been observed with the Roentgen Satellite (ROSAT) HRI detector. The outer shell was resolved from the bright central region and its X-ray morphology and luminosity determined. One-quarter of the soft X-rays originate in this shell. This result and a simple blast-wave model imply that the energy release in the supernova was about 2 x 10(exp 51) ergs.
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