Fig. 3.

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Rest-frame UV image with the F390W filter of HST of the A521. The red contours correspond to the ALMA CO(4–3) velocity integrated intensity in levels of 4σ, 5σ, 6σ, 7σ, 8σ, 10σ, 12σ, and 14σ with an RMS noise of 0.010 Jy beam−1 km s−1. The ALMA beam (0.19″ × 0.16″) is displayed in blue. The green crosses indicate bright foreground sources.
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