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Fig. 2.

image

Smoothed Hα VESTIGE images of NGC 4330 (top), NGC 4522 (centre), and NGC 4654 (bottom) compared with the GALEX FUV emission (magenta contours), SPIRE 250 μm emission (red contours), and VIVA HI emission (blue contours). The faintest emissions from the SPIRE 250 μm data are at surface brightness levels of 0.6 MJy sr−1, while the HI contour levels reach column densities values of ΣHI = 2 × 1019 cm−2. Dotted black ellipses trace the extensions of the galaxies’ optical discs. The regions of the tails outside the optical disc are considered for our photometric analysis (red dotted contours). Linear scales and synthesised beam sizes are shown in the bottom-left and bottom-right corners, respectively.

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