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

Published online by Cambridge University Press:  04 August 2017

I. R. Tuohy ,
M. A. Dopita ,
D. S. Mathewson ,
K. S. Long  and
D. J. Helfand
I. R. Tuohy
Affiliation:
Mount Stromlo and Siding Spring Observatories
M. A. Dopita
Affiliation:
Mount Stromlo and Siding Spring Observatories
D. S. Mathewson
Affiliation:
Mount Stromlo and Siding Spring Observatories
K. S. Long
Affiliation:
Columbia University
D. J. Helfand
Affiliation:
Columbia University

Extract

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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.

Type
VI. Supernova Remnants in Other Galaxies
Information
Symposium - International Astronomical Union , Volume 101: Supernova Remnants and Their X-Ray Emission , 1983 , pp. 559 - 565
Copyright
Copyright © Reidel 1983 

References

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