Two new supernova remnants in OB associations in the Large Magellanic Cloud

Details Two new supernova remnants in OB associations in the Large Magellanic Cloud Two new supernova remnants in OB associations in the Large Magellanic Cloud

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1266s&link_type=abstract

The Astronomical Journal, vol. 108, no. 4, p. 1266-1275

Astronomy and Astrophysics

Astronomy

25

Astronomical Photography, H Alpha Line, H Ii Regions, Magellanic Clouds, Supernova Remnants, X Ray Astronomy, X Ray Imagery, X Ray Sources, X Ray Spectra, Astronomical Spectroscopy, Charge Coupled Devices, Proportional Counters, Rosat Mission, X Ray Spectroscopy

Scientific paper

We discovered two extended x-ray sources in a Roentgen Satellite (ROSAT) Positron Sensitive Proportional Counter (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). Follow-up charge coupled device (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.

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