Open AccessDiscovery of a large‐scale clumpy structure around the Lynx supercluster at z ∼ 1.27
Author(s) -
Nakata Fumiaki,
Kodama Tadayuki,
Shimasaku Kazuhiro,
Doi Mamoru,
Furusawa Hisanori,
Hamabe Masaru,
Kimura Masahiko,
Komiyama Yutaka,
Miyazaki Satoshi,
Okamura Sadanori,
Ouchi Masami,
Sekiguchi Maki,
Ueda Yoshihiro,
Yagi Masafumi,
Yasuda Naoki
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.08756.x
Subject(s) - physics , supercluster (genetic) , astrophysics , galaxy , redshift , astronomy , galaxy cluster , subaru telescope , cluster (spacecraft) , spectral line , biochemistry , chemistry , phylogenetics , computer science , spectrograph , gene , programming language
ABSTRACT 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, 26.4 × 24.1 arcmin 2 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.