Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5601g&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #56.01; Bulletin of the American Astronomical Society, Vol. 24, p.1213
Other
Scientific paper
M33 is the current focus of a project to identify and study supernova remnantsi (SNRs) using observations in radio, X-ray and optical wavelengths. Here, we present the results from the radio selected sample of SNRs in M33. The radio observations were obtained with the Very Large Array and the Westerbork Synthesis Array at 6 and 20 cm. The flux and spectral index of all sources down to the 3sigma noise level of the maps have been measured. From the resulting catalogue, a list of candidate SNRs has been compiled, where the sample is defined as all radio sources with a non-thermal spectral index. This effectively eliminates most HII regions, but also includes background radio sources. Because of the inclusion of background sources, it is necessary to turn to other wavelengths for confirmation. We have examined the sites of radio emission using interference filter (6100 Angstroms, [SII], Hα ) observations taken with the KPNO 4m telescope. Following the method of Long et al. (1990,Ap. J. Suppl. 72,61), we have identified a list of 37 non-thermal radio sources that have a high [SII]/Hα ratio, making them probable optical SNR candidates. We have observed 32 of these spectroscopically at the MMT with the Red Channel long-slit spectrograph. The results of these observations will be presented. The multiwavelength approach allows us more than the ability to confirm the existence of new remnants, it also gives us valuable information on the dynamics of the SNR and its interaction with the surrounding medium. As an example, we are studying a particularily interesting remnant in M33 which has been detected in X-ray, radio and optical and is located in the HII region NGC 592. With information from all three wavelengths we are exploring the properties of the shock, the efficiency of conversion of shock energy into relativistic particles, and the state of evolution of the remnant.
Duric Neb
Gordon Scott
Kirshner Robert
Long Kelvin
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