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The central star‐forming region in a blue compact dwarf galaxy, II Zw 40, was observed in the 340‐GHz (880‐) band at ∼5 arcsec (250 pc) resolution with the Submillimetre Array (SMA). A source associated with the central star‐forming complex was detected with a flux of 13.6 ± 2.0 mJy. The structure is more extended than the beam in the east–west direction. The SMA 880‐ flux is analysed by using theoretical models of radio spectral energy distribution along with centimetre interferometric measurements in the literature. We find that (i) the SMA 880‐ flux is dominated (∼75 per cent) by free–free emission from the central compact star‐forming region and (ii) the contribution from dust emission to the SMA 880‐ flux is at most 4 ± 2.5 mJy. We also utilize our models to derive the radio–far‐infrared (FIR) relation of the II Zw 40 centre, suggesting that free–free absorption at low frequencies ( several GHz;  several cm) and the spatial extent of dust affect the radio–FIR relation.

Central free–free dominated 880‐μm emission in II Zw 40