| Autor: |
I. R. Tuohy, M. A. Dopita, D. S. Mathewson, K. S. Long, D. J. Helfand |
| Rok vydání: |
1983 |
| Předmět: |
|
| Zdroj: |
Symposium - International Astronomical Union. 101:559-565 |
| ISSN: |
0074-1809 |
| DOI: |
10.1017/s0074180900034434 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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