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The central star-forming regions in three blue compact dwarf galaxies (He2-10, NGC 5253, and II Zw 40) were observed in the 340 GHz (880 micron) band at5 arcsec resolution with the Submillimetre Array (SMA). Continuum emissionassociated with the central star-forming complex was detected in all thesegalaxies. The SMA 880 micron flux is decomposed into free-free emission anddust emission by using centimetre-wavelength data in the literature. We findthat free-free emission contributes half or more of the SMA 880 micron flux inthe central starbursts in those three galaxies. In spite of the dominance offree-free emission at 880 micron, the radio-to-far infrared (FIR) ratios in thecentral star-forming regions are not significantly higher than those of theentire systems, showing the robustness of radio-FIR relation. Based on therobustness of the radio-FIR relation, we argue that the free--free fraction inthe 880 micron emission is regulated by the dust temperature. We also analyzethe CO (J = 3--2) emission data. We find that CO is a good tracer of the totalgas mass in solar-metallicity object He 2-10. Low-metallicity objects, NGC 5253and II Zw 40, have apparently high star formation efficiencies; however, thismay be an artifact of significant dissociation of CO in the low-metallicityenvironments. We also point out a potential underestimate of dust mass, sincethe dust traced by emission is biased to the most luminous high-temperatureregions, particularly when a system hosts a compact star-forming region wherethe dust temperature is high.

Properties of free-free, dust, and CO emissions in the starbursts of blue compact dwarf galaxies