Fig. 8.
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The nuclear spiral structure detected in CO(3−2), HCN(4−3), HCO+ and CS(7−6) emission. Left: zoomed 8″ × 8″ region of CO(3−2) intensity map for NGC 1808 of Fig. 3. Right: integrated intensity maps of the dense gas tracers HCN(4−3), HCO+(4−3) and CS(7−6) in the top, middle and bottom panels, respectively, in the same region. The purple circle indicates the position of a clump detected in the HCN, HCO+ and CS.
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