Fig. 5
Left panel. CO velocity field (black-contoured) on top of H i velocity field map. Inside the black contours the colors represent the CO velocity, while outside they correspond to the H i velocity. The CO velocity is determined by the velocity of the line peak for 4σ detections. This map shows that the CO and the H i peak line temperature are detected at very similar velocities. Right panel. H i-CO velocity shift for the regions where CO velocity is determined. The shift is maximal in NGC604 (α = 13432, δ =+30°47′00′′(J2000)), where the dynamics of the gas is important.
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