Discovery of a Large Scale Clumpy Structure around the Lynx Supercluster at z~1.27

Details Discovery of a Large Scale Clumpy Structure around the Lynx Supercluster at z~1.27 Discovery of a Large Scale Clumpy Structure around the Lynx Supercluster at z~1.27

2004-12-17

arxiv.org/abs/astro-ph/0412460v1

Mon.Not.Roy.Astron.Soc. 357 (2005) 1357-1362

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.08756.x

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 z=1.27 in the Lynx region. Our analysis is based on deep, panoramic, and multi-colour imaging (26.4'x24.1') in VRi'z'-bands with the Suprime-Cam on the 8.2m 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 (5sigma) corresponding to \~M*+2.5 at this redshift. From the 2-D 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 (>5sigma), 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.

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