Fig. 3.

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CO(2−1) channel maps from the ALMA B6 data cube, generated using 3D-BAROLO modelling, provide insight into the morphology and gas kinematics of NGC 4593. The channel maps display velocities ranging from −230 km/s (top left) to +156 km/s (bottom right), relative to the galaxy’s systemic velocity (vsys). This vsys is estimated as the central velocity in the global line profile, valued at 12.56 km/s. The velocities presented signify deviations from this systemic velocity. Maps are shown in increments of 10 km/s, and each square box covers an area of 8.58″. The top row displays selected channels in blue, while the middle and bottom rows depict maps normalised using the azimuthal and local normalisation methods, respectively, highlighting distinct patterns in the emission’s spatial distribution and intensity. A green cross in each panel marks the disc’s centre, and solid red lines represent the RMS noise level (σrms) of 0.7 mJy.
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