Shapley Supercluster Survey: Galaxy evolution from filaments to cluster cores

We present an overview of a multiwavelength survey of the Shapley Supercluster (SSC; z ˜ 0.05) covering a contiguous area of 260h^{-2}_{70} Mpc^2 including the supercluster core. The projectmain aim is to quantify the influence of cluster-scale mass assembly ongalaxy evolution in one of the most massive structures in the localUniverse. The Shapley Supercluster Survey (ShaSS) includes nine Abellclusters (A3552 A3554 A3556 A3558 A3559 A3560 A3562 AS0724AS0726) and two poor clusters (SC1327-312 SC1329-313) showing evidenceof cluster-cluster interactions. Optical (ugri) and near-infrared (K)imaging acquired with VLT Survey Telescope and Visible and InfraredSurvey Telescope for Astronomy allow us to study the galaxy populationdown to m^⋆ + 6 at the supercluster redshift. A dedicatedspectroscopic survey with AAOmega on the Anglo-Australian Telescopeprovides a magnitude-limited sample of supercluster members with 80 percent completeness at ˜m^⋆ + 3. We derive the galaxydensity across the whole area demonstrating that all structures withinthis area are embedded in a single network of clusters groups andfilaments. The stellar mass density in the core of the SSC is alwayshigher than 9 × 10^9 M_⊙ Mpc^-3which is ˜40× the cosmic stellar mass density for galaxiesin the local Universe. We find a new filamentary structure (˜7 Mpclong in projection) connecting the SSC core to the cluster A3559 aswell as previously unidentified density peaks. We perform a weak-lensinganalysis of the central 1 deg^2 field of the survey obtainingfor the central cluster A3558 a mass ofM_{500}=7.63_{-3.40}^{+3.88}× 10^{14} M_{⊙} in agreement with X-ray based estimates.