surveys of the Magellanic Clouds - and the Potential for the New H
Survey Miroslav D. Filipovi\'c , Paul A. Jones , Graeme L. White , Raymond F. Haynes, PASA, 15 (1), 128
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Classification and Analysis of Discrete Sources in Common to the Radio and H Surveys
Out of the 180 sources common to the radio and H surveys of the LMC (Sect. 3), 88 (49%) have been previously classified (Filipović et al. 1997b and reference therein). Most are HII regions (53) and SNRs (34). Only one source common to both surveys towards the LMC is listed as a background object.
Similarly, from 40 sources common to the radio and H surveys of the SMC 27 (68%) have been classified in previous investigations (Filipović et al. 1997b). Again, most of these sources are intrinsic to the SMC (14 HII regions and 12 SNRs embedded in HII regions). There is one radio/H source behind the SMC.
Source Classifications
The majority of the MC HII regions (and SNRs embedded in HII regions) have been detected in H surveys. Some 95% of HII regions in the LMC (53 out of 56) and 88% in the SMC (14 out of 16) appear as H sources. This is not surprising as H emission is due to emission from the thermal surroundings of the MC sources. Only five radio HII regions are not detected in H surveys probably due to confusion. The similarity of broad scale structure between radio, IR and H emission from the MCs has been reported by Xu et al. (1992).
The relative number of background objects seen in both radio and H surveys is small (just two). Therefore, we conclude that the rest of the unclassified sources (92 in the LMC and 13 in the SMC) are more likely to be intrinsic i.e. HII regions. However, there is the possibility that some of these unclassified sources are indeed background objects.
Applying this criterion to the LMC, 85 out of 92 previously unclassified (radio to H) sources are suggested to be intrinsic. The other 7 sources common to radio and H surveys remain ambiguous. Similarly, from 13 unclassified radio and H sources in the SMC, 11 are suggested to be HII region candidates (or SNR candidates), and two sources remain ambiguous.
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