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Optical Observations of four Balmer-Dominated Supernova Remnants in the Large Magellanic Cloud

  • I. R. Tuohy (a1), M. A. Dopita (a1), D. S. Mathewson (a1), K. S. Long (a2) and D. J. Helfand (a2)...

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We report the optical identification of four Balmer-dominated supernova remnants (SNRs) in the Large Magellanic Cloud. Both the Balmer-dominated spectra and the presence of a broad Hα component in one remnant can be understood in terms of a very high velocity non-radiative shock encountering gas which is partially neutral, as proposed originally by Chevalier and Raymond to account for the similar spectra of the galactic remnants, Tycho and SN1006. From a consideration of the optical and X-ray luminosities of the SNR with broad Hα emission, we infer that the fraction of neutral gas in the medium is ≲ 30%. Radio observations of the LMC remnants show that their surface brightnesses are anomalously low; this could be intrinsic to the supernova themselves, or a result of their environment. Finally, we argue that the four SNRs all resulted from Type I supernovae, in which case they are the first such remnants to be identified outside the Galaxy.

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References

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Caswell, J.L., and Lerche, I.: 1979, Monthly Notices Roy. Astron. Soc. 187, 201.
Chevalier, R.A., Kirshner, R.P., and Raymond, J.C.: 1980, Astrophys. J. 235, 186 (CKR).
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Clarke, J.N., Little, A.G., and Mills, B.Y.: 1976, Aust. J. Phys., Astrophys. Suppl., #40.
Gronenschild, E.H.B.M., and Mewe, R.: 1981, Preprint.
Long, K.S., Dopita, M.A., and Tuohy, I.R.: 1982, Astrophys. J. 260, 202.
Long, K.S., Helfand, D.J., and Grabelsky, D.A.: 1981, Astrophys. J., 248, 925.
Mathewson, D.S., Ford, V.L., Dopita, M.A., Tuohy, I.R., Long, K.S., and Helfand, D.J.: 1982, Astrophys. J. Suppl., in press.
Mathewson, D.S., Ford, V.L., Dopita, M.A., Tuohy, I.R., Long, K.S., and Helfand, D.J.: 1983, this volume, p. 553.
Mills, B.Y., and Crawford, D.F.: 1981, Private communication.
Tuohy, I.R., Dopita, M.A., Mathewson, D.S., Long, K.S., and Helfand, D.J.: 1982, Astrophys. J. in press.

Optical Observations of four Balmer-Dominated Supernova Remnants in the Large Magellanic Cloud

  • I. R. Tuohy (a1), M. A. Dopita (a1), D. S. Mathewson (a1), K. S. Long (a2) and D. J. Helfand (a2)...

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