Ultra Deep Catalogue of Galaxy Structures in the COSMOS field

ILONA SOECHTING; COLDWELL GEORGINA; ROGER CLOWES; LUIS CAMPUSANO; MATTHEW GRAHAM

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2012 vol. 423 p. 2436 - 2450

0035-8711

This paper presents a large sample of intermediate to high redshift galaxy groups and clusters detected using a fully automated search in the COSMOS field. The detection algorithm is based on density peak extraction from a density distribution sampled using Voronoi tessellation within overlapping slices in the photometric redshift space.The cluster catalogue contains 1780 structures covering the redshift range 0.2 < z < 3.0. All clusters at z > 0.4 and many even belowthis threshold show very prominent substructure indicating that z ∼ 0.4 marks the slow emergence of virialized clusters in this field in agreement with published findings in other areas. The redshift distribution of detected structures shows strong variationswith prominent peaks suggesting the presence of large scale structures across the whole range covered by this catalogue. Supercluster candidates have been identified at redshifts z = 0.35, 0.72, 0.94, 1.12, 1.27, 1.45, 2.0 and 2.52. At z = 2.9 we identifieda compact agglomeration of galaxy groups and clusters suggesting the presence of another supercluster-like structure which would be the highest redshift candidate so far. Out of the nine supercluster candidates found in this study, six are new detections.