Structure and dynamics of the supercluster of galaxies SC0028-0005

O'MILL, ANA LAURA; DOMINIQUE PROUST; HUGO V. CAPELATO; MIRIAN CASTEJON; CYPRIANO; LIMA NETO; SODRÉ, LAERTE

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2015 vol. 453 p. 868 - 878

0035-8711

According to the standard cosmological scenario, superclusters areobjects that have just passed the turn-around point and are collapsing.The dynamics of very few superclusters have been analysed up to now. Inthis paper, we study the supercluster SC0028-0005, at redshift 0.22,identify the most prominent groups and/or clusters that make up thesupercluster, and investigate the dynamic state of this structure. Forthe membership identification, we have used photometric andspectroscopic data from Sloan Digital Sky Survey Data Release 10,finding six main structures in a flat spatial distribution. We have alsoused a deep multiband observation with MegaCam/Canada-France-HawaiiTelescope to estimate de mass distribution through the weak-lensingeffect. For the dynamical analysis, we have determined the relativedistances along the line of sight within the supercluster using theFundamental Plane of early-type galaxies. Finally, we have computed thepeculiar velocities of each of the main structures. The 3D distributionsuggests that SC0028-005 is indeed a collapsing supercluster, supportingthe formation scenario of these structures. Using the spherical collapsemodel, we estimate that the mass within r = 10 Mpc should lie between 4and 16 × 1015 M⊙. The farthest detectedmembers of the supercluster suggest that within ?60 Mpc thedensity contrast is δ ? 3 with respect to the criticaldensity at z = 0.22, implying a total mass of ?4.6-16 ×1017 M⊙, most of which in the form of low-massgalaxy groups or smaller substructures.