Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261..473t&link_type=abstract
Astrophysical Journal, Part 1, vol. 261, Oct. 15, 1982, p. 473-484.
Astronomy and Astrophysics
Astrophysics
72
Astronomical Spectroscopy, Magellanic Clouds, Optical Emission Spectroscopy, Supernova Remnants, Supernovae, X Ray Sources, Balmer Series, H Alpha Line, Radio Emission
Scientific paper
Optical emission-line images are presented for four SNR's that are luminous X-ray sources and that were recently discovered during an X-ray survey of the LMC. The images reveal distinct filamentary shells that are prominent in the Balmer lines of H but are either absent or very weak in forbidden O III and forbidden S II emission. One remnant exhibits clear evidence for velocity-broadened H-alpha emission, and all four are expanding into regions with a relatively low H I density. It is shown that both the broad H-alpha emission and the Balmer-dominated spectra can be understood in terms of a very high-velocity nonradiative shock encountering gas that is partially neutral. The optical, X-ray, and radio properties of the LMC remnants are compared with those of relatively young galactic SNR's. It is concluded that all four LMC remnants resulted from Type I supernovae.
Dopita Mike A.
Helfand David J.
Long Knox S.
Mathewson D. S.
Tuohy Ian R.
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