Two New Supernova Remnants in OB Associations in the Large
Magellanic Cloud
R.C. Smith, Y-H. Chu, M-M. Mac Low, M.S. Oey, & U. Klein
We discovered two extended X-ray sources in a ROSAT PSPC
observation pointed at the H II region N9 in the Large Magellanic
Cloud. These two sources are in the H II regions N4D and N9. The
X-ray characteristics suggest that both might be supernova remnants
(SNRs). Followup CCD images taken with interference filters show
high [S II] / H-alpha ratios in the optical nebulae of these X-ray
sources, confirming the presence of high velocity shocks commonly seen
in SNRs. These two sources are also detected in the radio continuum
at 8.55 and 4.75 GHz; both appear nonthermal compared to nearby H II
regions. The confirmation of these two SNRs demonstrates that many
SNRs in or near H II regions have been overlooked in previous surveys,
and that the ROSAT X-ray survey combined with an optical CCD
imaging survey of the Magellanic Clouds would provide the most
effective way to uncover SNRs.
1994 AJ 108, 1266
Journal article via ADS
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