Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19511212w&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #112.12; Bulletin of the American Astronomical Society, Vol. 32, p.877
Astronomy and Astrophysics
Astronomy
Scientific paper
SNR 0540-6944, discovered by Chu et al. (1997, AJ, 113, 1815), is difficult to observe in optical and radio due to emission from the surrounding HII region N159; the X-ray emission is similarly obscured by that from nearby X-ray binary LMC X-1. The SNR's expansion was serindipitously uncovered in optical echelle observations, and its SNR nature confirmed by using soft-band (0.1-1.0 keV) ROSAT PSPC images to separate the SNR's thermal emission from the much harder emission of LMC X-1. However, the SNR remained spatially and spectrally confused with LMC X-1 at the resolution of the ROSAT observations. The unprecedented combination of spatial and spectral resolution from the Chandra X-ray Observatory and its instruments allows us, for the first time, to get a picture of SNR 0540-6944 distinct from that of LMC X-1. Using these data, we are able to present images and spectra from the SNR itself. The results serve to confirm the SNR identification of Chu et al. 1997; to provide spatial and spectral data on the SNR itself; and to illustrate the information that may be gleaned by separating out objects whose emission is confused by close proximity. Funding for this work was provided by the NRC and NASA's GSFC.
Chu Y.-H. Y.-H.
Petre Rob
Williams Rosa M.
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