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We present a new optical imaging survey of supernova remnants in M83, usingdata obtained with the Magellan I 6.5m telescope and IMACS instrument underconditions of excellent seeing. Using the criterion of strong [S II] emissionrelative to Halpha, we confirm all but three of the 71 SNR candidates listed inour previous survey, and expand the SNR candidate list to 225 objects, morethan tripling the earlier sample. Comparing the optical survey with a new deepX-ray survey of M83 with Chandra, we find 61 of these SNR candidates to haveX-ray counterparts. We also identify an additional list of 46 [O III] -selectednebulae for follow-up as potential ejecta-dominated remnants, seven of whichhave associated X-ray emission that makes them strong candidates. Some of theother [O III]-bright objects could also be normal ISM-dominated supernovaremnants with shocks fast enough to doubly ionize oxygen, but with Halpha and[S II] emission faint enough to have been missed. A few of these objects mayalso be H II regions with abnormally high [O III] emission compared with themajority of M83 H II regions, compact nebulae excited by young Wolf-Rayetstars, or even background AGN. The supernova remnant Halpha luminosity functionin M83 is shifted a factor of ~ 4.5x higher than for M33 supernova remnants,indicative of a higher mean ISM density in M83. We describe the searchtechnique used to identify the supernova remnant candidates and provide basicinformation and finder charts for the objects.

The Magellan/IMACS Catalog of Optical Supernova Remnant Candidates in M83