Optical emission-line properties of M33 supernova remnants

Details Optical emission-line properties of M33 supernova remnants Optical emission-line properties of M33 supernova remnants

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..564s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 2, p. 564-578.

Astronomy and Astrophysics

Astronomy

51

Emission Spectra, Galactic Nuclei, H Ii Regions, Supernova Remnants, Abundance, Astronomical Spectroscopy, Galactic Structure, Interstellar Gas, Photoionization, Planetary Nebulae, Sky Surveys (Astronomy)

Scientific paper

We have obtained spectra of the 42 SNRs and remnant candidates identified in the recent survey of the inner portion of M33. Relative fluxes for the important diagnostic emission lines in the red portion of the optical spectrum are reported. We have confirmed that all the candidate SNRs have forbidden S II/H-alpha ratios 0.4 or greater, the canonical dividing line between SNR emission and emission from the photoionized gas in H II regions and planetary nebulae. Significant forbidden O I emission, another distinguishing characteristic of shocked gas, is also seen in the majority of the remnants. We find little evidence of emission-line variation with SNR diameter, unlike that reported in previous SNR samples. Using published grids of shock models, we derive abundances and abundance gradients in the interstellar gas in M33. While the oxygen abundances and gradient derived agree (to within the rather large errors) with those derived from H II region studies, the nitrogen abundances and gradient show the same offset as previously noted in studies of other galaxies.

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