High-resolution radio observations of five supernova remnants

Abstract

Five supernova remnants have been mapped with high resolution using the Fleurs synthesis radio telescope. Four of the sources (G33.6+0.1, G309.2–0.6, G315.4–0.3 and G320.4–1.2) possess shell structures, albeit with considerable distortion; the fifth source, G308.7+0.0, has a centrally concentrated brightness distribution reminiscent of the Crab nebula but considerably more elongated. In the general direction of G320.4–1.2 there is considerable optical emission but only the brightest features seem to be associated with the radio source; currently available sky survey photographs show no associated optical nebulosity in the direction of the other four remnants.