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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References
Caswell, J. L. & Haynes, R. F. Astr. Astrophys. 171, 261–276 (1987).
Broadbent, A., Haslam, C. G. T. & Osborne, J. L. Mon. Not. R. astr. Soc. 237, 381–410 (1989).
Becker, R. H. & Helfand, D. J. Nature 313, 115–118 (1985).
Mills, B. Y. Proc. astr. Soc. Aust. 4, 156–159 (1981).
Whiteoak, J. B. Z., Large, M. I., Cram, L. E. & Piestrzynski, B. Proc. astr. Soc. Aust. 8, 176–179 (1989).
Haynes, R. F., Caswell, J. L. & Simons, L. W. J. Aust J. Phys. Astrophys. Suppl. 45, 1–87 (1978).
Georgelin, Y. P. & Georgelin, Y. M. Astr. Astrophys. Suppl. Ser. 3, 1–49 (1970).
Lyngâ, G. & Hansson, N. Astr. Astrophys. Suppl. Ser. 6, 327–414 (1972).
Shaver, P. A. & Goss, W. M. Aust J. Phys. Astrophys. Suppl. 14, 133–196 (1970).
Shaver, P. A. Astr. Astrophys. 105, 306–312 (1982).
Green, D. A. Astrophys. Space Sci. 148, 3–74 (1988).
Velusamy, T., Kundu, M. R. & Becker, R. H. Astr. Astrophys 51, 21–24 (1976).
Clifton, T. R. et al. IAU Circ. 4422 (1987).
Kulkarni, S. R. et al. Nature 331, 50–53 (1988).
Manchester, R. N. Astr. Astrophys. 171, 205–215 (1987).
Helfand, D. J. & Becker, R. H. Nature 313, 118–119 (1985).
Hjellming, R. M. & Johnston, K. J. Proc. lAU Symp. 97 (eds Heeschen, D. S. & Wade, C. M.) 197–204 (Reldel, Dordrecht, 1981).
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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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DOI: https://doi.org/10.1038/347157a0
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