Structures of four supernova remnants at 1.4 GHz

Abstract
Four small-diameter supernova remnants (SNRs) have been mapped with the Fleurs synthesis radio telescope; the maps are the first to reveal structure in these SNRs, all of which lie near zero declination, where most other synthesis telescopes do not provide satisfactory north-south resolution. Three of the sources (G15.9 + 0.2, G27.4 + 0.0 and G41.1 – 0.3) show clear indications of a shell structure; the remaining source, G39.2 – 0.3, may be a rarer variety of SNR showing centrally concentrated emission similar to the Crab Nebula.

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