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Title:
A deficit of faint red galaxies in the possible large-scale structures around the RDCS J1252.9-2927 cluster at z = 1.24
Authors:
Tanaka, Masayuki; Kodama, Tadayuki; Kajisawa, Masaru; Bower, Richard; Demarco, Ricardo; Finoguenov, Alexis; Lidman, Chris; Rosati, Piero
Affiliation:
AA(Department of Astronomy, School of Science, University of Tokyo, Tokyo 113-0033, Japan), AB(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan), AC(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan), AD(Department of Physics, University of Durham, South Road, Durham DH1 3LE), AE(Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686, USA), AF(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany), AG(European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile), AH(European Southern Observatory, Karl Schwarzschild Strasse 2, Garching bei Muenchen D-85748, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 377, Issue 3, pp. 1206-1214. (MNRAS Homepage)
Publication Date:
05/2007
Origin:
MNRAS
MNRAS Keywords:
galaxies: clusters: individual: RDCSJ1252.9-2927 , galaxies: evolution , galaxies: fundamental parameters , large-scale structure of Universe
Abstract Copyright:
(c) 2007 The Authors. Journal compilation © 2007 RAS
DOI:
10.1111/j.1365-2966.2007.11671.x
Bibliographic Code:
2007MNRAS.377.1206T

Abstract

We report a discovery of possible large-scale structures around the RDCS J1252.9-2927 cluster at z = 1.24 based on photometric redshifts. We carried out multiband wide-field imaging with Suprime-Cam on the Subaru Telescope and WFCAM on the United Kingdom Infrared Telescope (UKIRT). Our data cover an approximately 35 × 30-arcmin2 field in V,R,i',z' and K bands. We apply a photometric redshift technique to extract galaxies at or near the cluster redshift. The distribution of photo-z selected galaxies reveals clumpy structures surrounding the central cluster. It seems that there is a large (>20 Mpc) filamentary structure extending in the north-east-south-west direction. We compare the observed structure with an X-ray map and find that two of the four plausible clumps show significant X-ray emissions and one with a marginal detection, which strongly suggests that they are dynamically bound systems. Following the discovery of the possible large-scale structure, we carried out deeper SOFI Ks-band imaging with the New Technology Telescope on four plausible clumps. We construct the optical-to-near-infrared colour-magnitude diagrams of the galaxies in the clumps, and find that the colour-magnitude relation (CMR) of the red galaxies in the clumps is sharply truncated below Ks = 22. Few faint red galaxies are seen in these clumps. This suggests that the CMR first appears at the bright magnitudes and it extends to the fainter magnitudes with time, which is consistent with the `downsizing' picture. Interestingly, the CMR of the main cluster has previously been shown to have a clear relation down to Ks = 23. This confirms our previous suggestion that the build-up of the CMR is delayed in low-density environments. All in all, we suggest that galaxies follow the `environment-dependent downsizing' evolution. Massive galaxies in high-density environments first stop forming stars and become red. Less massive galaxies in less dense environments become red at later times. Based on a few assumptions, we predict that the brightest tip of the CMR appears at z ~ 2.5.
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