Supernova remnant 0540-693

Details Supernova remnant 0540-693 Supernova remnant 0540-693

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasau..11...83s&link_type=abstract

Astronomical Society of Australia, Proceedings, vol. 11, no. 1, p. 83

Astronomy and Astrophysics

Astronomy

1

Emission Spectra, Magellanic Clouds, Pulsars, Radio Emission, Shock Waves, Supernova Remnants, Crab Nebula, Interstellar Matter, Radio Astronomy, Radio Sources (Astronomy), Stellar Luminosity

Scientific paper

Supernova remnant (SNR) 0540-693 in the Large Magellanic Cloud appears to be the youngest supernova remnant, after SN 1987A, in the LMC. It contains a 50-ms pulsar which has been detected at X-ray, optical and radio wavelengths (Seward, Harnden and Helfand, 1984, Astrophys. J., 287, L19; Middleditch and Pennypacker, 1985, Nature, 313, 659; Manchester et al., Astrophys. J., 403, L29), surrounded by a synchrotron nebula about 1.4 pc in diameter. The central nebula is smaller and less luminous than, but still closely analogous to, the Crab Nebula. The power injected by the spinning down of the central pulsar is 1.5 x 1038/ergs, compared with 4.5 x 1038/ergs for the Crab. However, unlike the Crab, SNR 0540-693 has a bright annular component which has a radius of 9 pc. This emission is generated by interaction of the supernova shock with the circumstellar medium. Full details of an Australia Telescope Compact Array multiwavelength study of both the central and shell components appear in Manchester, Staveley-Smith and Kesteven (1993, Astrophys. J., 411, 756). Recent, more sensitive, 1.4 GHz observations suggest that the shell may extend further than initially thought (radius approximately 11 pc). The implied large expansion velocity (1.3x104 km/s), combined with the likelihood of pulsar-powered expansion of the inner line-emitting region, means that the optically-derived age of 760 years (Kirschner et al., 1989, Astrophys. J., 342, 260) may be underestimated by a factor of approximately 2. Nevertheless, SNR 0540-693 remains a very young SNR whose environment is similar to that of SN 1987A and which may provide important clues to the future evolution of the latter.

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