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While our current cosmological model places galaxy clusters at the nodes of afilament network (the cosmic web), we still struggle to detect these filamentsat high redshifts. We perform a weak lensing study for a sample of 16 massive,medium-high redshift (0.4<z<0.9) galaxy clusters from the DAFT/FADA survey,that are imaged in at least three optical bands with Subaru/Suprime-Cam orCFHT/MegaCam. We estimate the cluster masses using an NFW fit to the shearprofile measured in a KSB-like method, adding our contribution to thecalibration of the observable-mass relation required for cluster abundancecosmological studies. We compute convergence maps and select structures within,securing their detection with noise re-sampling techniques. Taking advantage ofthe large field of view of our data, we study cluster environment, addinginformation from galaxy density maps at the cluster redshift and from X-rayimages when available. We find that clusters show a large variety of weaklensing maps at large scales and that they may all be embedded in filamentarystructures at megaparsec scale. We classify them in three categories accordingto the smoothness of their weak lensing contours and to the amount ofsubstructures: relaxed (~7%), past mergers (~21.5%), recent or present mergers(~71.5%). The fraction of clusters undergoing merging events observationallysupports the hierarchical scenario of cluster growth, and implies that massiveclusters are strongly evolving at the studied redshifts. Finally, we report thedetection of unusually elongated structures in CLJ0152, MACSJ0454, MACSJ0717,A851, BMW1226, MACSJ1621, and MS1621.

Weak lensing study of 16 DAFT/FADA clusters: substructures and filaments