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

Abstract

view Abstract Citations (28) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The New Supernova Remnants in OB Associations in the Large Magellanic Cloud Smith, R. Chris ; Chu, You-Hua ; Mac Low, Mordecai-Mark ; Oey, M. S. ; Klein, Uli Abstract 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). Follow-up CCD images taken with interference filters show high [S II]/Hα 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. Publication: The Astronomical Journal Pub Date: October 1994 DOI: 10.1086/117152 Bibcode: 1994AJ....108.1266S Keywords: 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; Astronomy; SUPERNOVA REMNANTS; ISM: INDIVIDUAL OBJECTS: N4D; HII REGIONS full text sources ADS | data products SIMBAD (15) NED (1)