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We aim to review the internal structure and dynamics of the Abell 1351cluster, shown to host a radio halo with a quite irregular shape. Our analysisis based on radial velocity data for 135 galaxies obtained at the TelescopioNazionale Galileo. We combine galaxy velocities and positions to select 95cluster galaxy members and analyse the internal dynamics of the whole cluster.We also examine X-ray data retrieved from Chandra and XMM archives. We measurethe cluster redshift, <z>=0.325, the line-of-sight (LOS) velocity dispersion,\sigma_v~1500 km/s, and the X-ray temperature, kT~9 keV. From both X-ray andoptical data independently, we estimate a large cluster mass, in the 1--4$10^{15}$ M$_\odot$ range. We attribute the extremely high value of \sigma_v tothe bimodality in the velocity distribution. We find evidence of a significantvelocity gradient and optical 3D substructure. The X-ray analysis also showsmany features in favour of a complex cluster structure, probably supporting anongoing merger of substructures in Abell 1351. The observational scenarioagrees with the presence of two main subclusters in the northern region, eachwith its brightest galaxy (BCG1 and BCG2), detected as the two most importantX-ray substructures with a rest-frame LOS velocity difference of \Delta v~2500km/s (in the rest frame) and probably being in large part aligned with the LOS.We conclude that Abell 1351 is a massive merging cluster. The details of thecluster structure allow us to interpret the quite asymmetric radio halo as a`normal' halo plus a southern relic, strongly supporting a previous suggestionbased only on inspection of radio and preliminary X-ray data.

The structure of Abell 1351: a bimodal galaxy cluster with peculiar diffuse radio emission