Superclustering of Faint Galaxies in the Field of a QSO Concentration at z~1.1

Abstract

We report on a wide-area (48' x 9') imaging survey of faint galaxies in R and I bands toward the 1338+27 field where an unusual concentration of five QSOs at z\sim1.1, embedded in a larger-scale clustering of 23 QSOs, is known to exist. Using a quite homogeneous galaxy catalog with a detection completeness limit of I~23.5, we detect a significant clustering signature of faint red galaxies with I > 21 and R-I > 1.2 over a scale extending to ~20h^{-1}_{50} Mpc. Close examination of the color-magnitude diagram, the luminosity function, and the angular correlation function indeed suggests that those galaxies are located at z~1.1 and trace the underlying large-scale structure at that epoch, together with the group of 5 QSOs. Since the whole extent of the cluster of 23 QSOs (~70h^{-1}_{50} Mpc) is roughly similar to the local ``Great Wall'', the area may contain a high-redshift counterpart of superclusters in the local universe.

arXiv comment21 pages including 7 EPS color figures; accepted for publication for the Astrophysical Journal (2001)

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• The [OII]3727 Luminosity function and Star Formation Rate at z~1.2 in the COSMOS 2 Square-degree Field and the Subaru Deep Field
• Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging
• Discovery of a Large Scale Clumpy Structure around the Lynx Supercluster at z~1.27
• An H-alpha search for over-dense regions at z=2.23
• Two close Large Quasar Groups of size ~ 350 Mpc at z ~ 1.2
• Searching High Redshift Large-Scale Structures: Photometry of Four Fields Around Quasar Pairs at z~1
• The Galaxy Environment of a Quasar at z=1.226: A Possible Cluster Merger
• Large Scale Structure at z=1.2 Outlined by MgII Absorbers
• Stellar populations in superclusters of galaxies
• Detection of 20-30 Mpc-scale Galaxy Structures Embedded in 100 Mpc-scale Structures of Quasars and MgII Absorbers at z~0.8 and z~1.2
• Optical Identification of the ASCA Lynx Deep Survey: An Association of QSOs and a Supercluster at z=1.3?
• Triplets of Quasars at high redshift I: Photometric data