Arp220 stellar kinematic maps from our pPXF analysis. The contours in the left-hand panel show the negative (dark blue) and positive (dark red) isovelocity curves, from −100 to +100 km s⁻¹, equally spaced in steps of 20 km s⁻¹; the contours in the right-hand panel are derived from the continuum emission image shown in Fig. 2 (top left) and are equally spaced in steps of 0.25 dex, starting from 1.3 × 10⁻¹⁶ erg s⁻¹ cm⁻² arcsec⁻². The crosses mark the two nuclei; the dashed yellow line in the left-hand panel shows PA = 48°, corresponding to the major axis of Arp220. Right-hand panel: the inset shows a zoomed-in view of the innermost nuclear regions, highlighting the ring-like shape with high σ_* values (using a slightly different colour bar); the positions of the two nuclei are shown with black crosses. Stellar velocity dispersions are not corrected for the instrumental broadening. North is up.