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We present two new examples of galaxies undergoing transformation in theShapley supercluster core. These low-mass (stellar mass from 0.4E10 to 1E10Msun) galaxies are members of the two clusters SC-1329-313 (z=0.045) andSC-1327-312 (z=0.049). Integral-field spectroscopy complemented by imaging inugriK bands and in Halpha narrow-band are used to disentangle the effects oftidal interaction (TI) and ram-pressure stripping (RPS). In both galaxies,SOS-61086 and SOS-90630, we observe one-sided extraplanar ionized gas extendingrespectively 30kpc and 41kpc in projection from their disks. The galaxies'gaseous disks are truncated and the kinematics of the stellar and gascomponents are decoupled, supporting the RPS scenario. The emission of theionized gas extends in the direction of a possible companion for both galaxiessuggesting a TI. The overall gas velocity field of SOS-61086 is reproduced byad hoc N-body/hydrodynamical simulations of RPS acting almost face-on andstarting about 250Myr ago, consistent with the age of the young stellarpopulations. A link between the observed gas stripping and the cluster-clusterinteraction experienced by SC-1329-313 and A3562 is suggested. Simulations ofram pressure acting almost edge-on are able to fully reproduce the gas velocityfield of SOS-90630, but cannot at the same time reproduce the extended tail ofoutflowing gas. This suggests that an additional disturbance from a TI isrequired. This study adds a piece of evidence that RPS may take place indifferent environments with different impacts and witnesses the possible effectof cluster-cluster merger on RPS.

Shapley Supercluster Survey: Ram-Pressure Stripping vs. Tidal Interactions in the Shapley Supercluster