Mon. Not. R. Astron. Soc., 357, 1357-1362 (2005/March-2)
Discovery of a large-scale clumpy structure around the Lynx supercluster at z∼ 1.27.
NAKATA F., KODAMA T., SHIMASAKU K., DOI M., FURUSAWA H., HAMABE M., KIMURA M., KOMIYAMA Y., MIYAZAKI S., OKAMURA S., OUCHI M., SEKIGUCHI M., UEDA Y., YAGI M. and YASUDA N.
Abstract (from CDS):
We report the discovery of a probable large-scale structure composed of many galaxy clumps around the known twin clusters at z= 1.26 and 1.27 in the Lynx region. Our analysis is based on deep, panoramic, and multicolour imaging, 26.4x24.1 arcmin2 in VRi'z' bands with the Suprime-Cam on the 8.2-m Subaru telescope. This unique, deep and wide-field imaging data set allows us for the first time to map out the galaxy distribution in the highest-redshift supercluster known. We apply a photometric redshift technique to extract plausible cluster members at z∼ 1.27 down to i'= 26.15 (5σ) corresponding to ∼M*+ 2.5 at this redshift. From the two-dimensional distribution of these photometrically selected galaxies, we newly identify seven candidates of galaxy groups or clusters where the surface density of red galaxies is significantly high (>5σ), in addition to the two known clusters. These candidates show clear red colour-magnitude sequences consistent with a passive evolution model, which suggests the existence of additional high-density regions around the Lynx superclusters.
galaxies: clusters: individual: RXJ 0848.6+4453 - galaxies: clusters: individual: RXJ 0848.9+4452 - galaxies: evolution - galaxies: formation - large-scale structure of Universe
VizieR on-line data:
<Available at CDS (J/MNRAS/357/1357): table2.dat>
Table 2: [NKS2005] clN (Nos cl1, cl2), [NKS2005] grN (Nos gr1 to gr7).
P. 1360 : RDCS 1252 = RDCS J1252-2927.
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