A Study of Optical Observing Techniques for Extra-Galactic Supernova
  Remnants: Case of NGC 300
  We present the results of a study of observational and identification
techniques used for surveys and spectroscopy of candidate supernova remnants
(SNRs) in the Sculptor Group galaxy NGC 300. The goal of this study was to
investigate the reliability of using [Sii]/Halpha > 0.4 in optical SNR surveys
and spectra as an identifying feature of extra-galactic SNRs (egSNRs) and also
to investigate the effectiveness of the observing techniques (which are
hampered by seeing conditions and telescope pointing errors) using this
criterion in egSNR surveys and spectrographs. This study is based on original
observations of these objects and archival data obtained from the Hubble Space
Telescope which contained images of some of the candidate SNRs in NGC 300. We
found that the reliability of spectral techniques may be questionable and very
high-resolution images may be needed to confirm a valid identification of some
egSNRs.
