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We study the case of a bright (L>L*) barred spiral galaxy from the richcluster A3558 in the Shapley supercluster core (z=0.05) undergoing ram-pressurestripping. Integral-field spectroscopy, complemented by multi-band imaging,allows us to reveal the impact of ram pressure on the interstellar medium. Westudy in detail the kinematics and the physical conditions of the ionized gasand the properties of the stellar populations. We observe one-sided extraplanarionized gas along the full extent of the galaxy disc. Narrow-band Halphaimaging resolves this outflow into a complex of knots and filaments. The gasvelocity field is complex with the extraplanar gas showing signature ofrotation. In all parts of the galaxy, we find a significant contribution fromshock excitation, as well as emission powered by star formation. Shock-ionizedgas is associated with the turbulent gas outflow and highly attenuated by dust.All these findings cover the whole phenomenology of early-stage ram-pressurestripping. Intense, highly obscured star formation is taking place in thenucleus, probably related to the bar, and in a region 12 kpc South-West fromthe centre. In the SW region we identify a starburst characterized by a 5xincrease in the star-formation rate over the last ~100 Myr, possibly related tothe compression of the interstellar gas by the ram pressure. The scenariosuggested by the observations is supported and refined by ad hocN-body/hydrodynamical simulations which identify a rather narrow temporal rangefor the onset of ram-pressure stripping around t~60 Myr ago, and an anglebetween the galaxy rotation axis and the intra-cluster medium wind of ~45 deg.Taking into account that the galaxy is found ~1 Mpc from the cluster centre ina relatively low-density region, this study shows that ram-pressure strippingstill acts efficiently on massive galaxies well outside the cluster cores.

ACCESS - V. Dissecting ram-pressure stripping through integral-field spectroscopy and multi-band imaging