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We present and discuss results from the first spatially resolved kinematicstudy of ram-pressure stripping of a massive late-type galaxy at intermediateredshifts. Our target, the spectacular "jellyfish" galaxy A1758N\_JFG1, waspreviously identified as a fast-moving member of the equal-mass merger A1758N($z=0.28$) with a star-formation rate of 48 M$_\odot$ yr$^{-1}$, far above thegalaxy main sequence. IFU data obtained by us unambiguously confirmram-pressure stripping as the physical mechanism driving the optical morphologyand high star-formation rate of this system by revealing extended[\ion{O}{2}]$\lambda$3727\AA\ emission up to 40 kpc (in projection) downstream,as well as an ordered radial-velocity field generated by (a) conservation ofangular momentum of the interstellar gas stripped from the edge of the galacticdisk and (b) drag forces exerted by the intra-cluster medium on the "tentacles"of stripped material. We find no evidence of significant nuclear activity inA1758N\_JFG1, although an AGN might, at this early stage of the strippingprocess, be obscured by high column densities of gas and dust near the galacticcore. Finally, our exploration of possible trajectories of A1758N\_JFG1 foundsolutions consistent with the notions (a) that the A1758N merger proceeds alongan axis that is substantially inclined with respect to the plane of the sky and(b) that A1758N\_JFG1 participated in the merger, rather than having beenaccreted independently from the field.

Jellyfish: Resolving the kinematics of extreme ram-pressure stripping at $z\sim0.3$