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Unusual radio arcs discovered in the radio source G318.9+0.4

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Abstract

THE radio source G318.9 + 0.4 has been tentatively identified as a supernova remnant (SNR)1,2. Here I report observations at 843 MHz revealing a remarkable network of arcs in the object which exclude it from any of the standard classes of SNRs. The arcs outline an approximately elliptical region enclosing a bright off-centre core component which has several curved extensions. Although the appearance of the arc structures is unprecedented, G318.9 + 0.4 might belong to a recently proposed class of non-thermal axisymmetric radio sources unrelated to SNRs3. Alternatively, the core component may indeed be a SNR, excited by the stellar remnant of the supernova event, with the arc emission arising through jet activity.

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  1. School of Physics, The University of Sydney, NSW 2006, Australia

    J. B. Z. Whiteoak

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Whiteoak, J. Unusual radio arcs discovered in the radio source G318.9+0.4. Nature 347, 157–158 (1990). https://doi.org/10.1038/347157a0

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