A New Optical Sample of Supernova Remnants in M33

Details A New Optical Sample of Supernova Remnants in M33 A New Optical Sample of Supernova Remnants in M33

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apjs..117...89g&link_type=abstract

Astrophysical Journal Supplement v.117, p.89

Astronomy and Astrophysics

Astronomy

50

Galaxies: Individual Messier Number: M33, Galaxies: Ism, Radio Continuum: Galaxies, Ism: Supernova Remnants

Scientific paper

We present a new and larger sample of supernova remnants in the nearby spiral galaxy M33. The sample is based upon CCD interference filter observations obtained with the Kitt Peak 4 m telescope and spectroscopic observations obtained with the Multiple Mirror Telescope. Using optical emission-line ratios, supplemented by a radio continuum map of M33 (Duric et al.; Gordon et al.), we have identified 98 supernova remnant (SNR) candidates, of which 53 were previously unknown. We have obtained spectra of 27 SNR candidates, bringing the total number of M33 SNRs for which spectra are available to 72. All the spectra show the characteristic signature of shock-heated gas, which leads us to believe that the rest of the candidates are also supernova remnants. The large sample provides a useful database to investigate the global properties of SNRs. In this paper, we present a new cumulative number-diameter [N(

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