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A VLBI Search for a Pulsar Nebula in SN1993J in the Galaxy M81

  • N. Bartel (a1), M. F. Bietenholz (a1), W. H. Cannon (a1), M. P. Rupen (a2), A. J. Beasley (a2), D. A. Graham (a3), V. I. Altunin (a4), T. Venturi (a5), G. Umana (a5) and J. E. Conway (a6)...

Abstract

Twenty consecutive VLBI images of supernova 1993J in M81 from the time of explosion to the present show the dynamic evolution of the expanding radio shell of an exploded star. No clear sign of a pulsar nebula, expected to have a spectral luminosity 10 to 1,000 times larger than that of the Crab, has yet been seen. The upper limit on the brightness at 8.4 GHz in the center of the shell in one of the latest images is 0.15 mJy per beam of 0.4 mas2, corresponding to a spectral luminosity of that of the Crab. Any nebula that may have formed in the center is probably still obscured by the surrounding thermal matter with no substantial filamentation having yet occurred in the latter.

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References

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Bandiera, R., Padni, F., & Salvati, M., 1984, ApJ, 285, 134
Bartel, N. et al. 2000, Science, 287, 112
Bietenholz, M.F., Bartel, N., & Rupen, M.P. 2000, ApJ, in press
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Chevalier, R.A. 1982, ApJ, 258, 790
Reynolds, S.P. & Chevalier, R.A. 1984, ApJ, 278, 630

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