| AND (2007) | |||||||||||||
Abstract | |||||||||||||
| We have conducted a multiwavelength (X-ray, optical, and radio) search for supernova remnants (SNRs) in the nearby Sculptor Group Sd galaxy NGC 300. Our Very Large Array (VLA) radio observations at 6 cm and 20 cm have been combined with previously published optical results, our own optical image, and archived ROSAT X-ray data to search for new SNR candidates. Of the 28 optically identied SNRs found by Blair & Long, three exhibit some combination of X-ray and radio emission, but in general X-ray and radio emission from the optically identied SNRs is undetected. A radio-selected sample of SNR candidates is constructed by searching for positional coincidences between nonthermal radio continuum sources and sources of Ha emission with the intent of nding SNRs that are typically overlooked using the [S II]/Ha criterion, i.e., those SNRs that are either confused by Ha emission or which are Balmer-dominated. This search has yielded 17 SNR candidates, of which 14 are new and three were already known from the optically selected sample. Four of the radioselected candidates also possess detectable X-ray emission. A complementary analysis of the X-ray data has yielded an X-rayselected sample of candidates consisting of six soft-spectrum sources (kT \ 1 keV) coincident with regions of Ha emission. Two of these | |||||||||||||
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