Proceedings of the International Astronomical Union

Contributed Papers

Discovery of a large-scale clumpy structure of the Lynx supercluster at z[similar]1.27

Fumiaki Nakata a1a2a3, Tadayuki Kodama a2a3, Kazuhiro Shimasaku a3, Mamoru Doi a4, Hisanori Furusawa a5, Masaru Hamabe a6, Masahiko Kimura a7, Yutaka Komiyama a5, Satoshi Miyazaki a5, Sadanori Okamura a3, Masami Ouchi a3, Maki Sekiguchi a8, Masafumi Yagi a2 and Naoki Yasuda a8
a1 Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK email:
a2 National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
a3 Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
a4 Institute of Astronomy, University of Tokyo, Mitaka, Tokyo 181-1500, Japan
a5 Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI 96720, USA
a6 Department of Mathematical and Physical Sciences, Faculty of Science, Japan Women's University, Bunkyo-ku, Tokyo 112-8681, Japan
a7 Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
a8 Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan

Article author query
nakata f   [Google Scholar] 
kodama t   [Google Scholar] 
shimasaku k   [Google Scholar] 
doi m   [Google Scholar] 
furusawa h   [Google Scholar] 
hamabe m   [Google Scholar] 
kimura m   [Google Scholar] 
komiyama y   [Google Scholar] 
miyazaki s   [Google Scholar] 
okamura s   [Google Scholar] 
ouchi m   [Google Scholar] 
sekiguchi m   [Google Scholar] 
yagi m   [Google Scholar] 
yasuda n   [Google Scholar] 
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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 with the Suprime-Cam on the 8.2 m Subaru telescope. We apply a photometric redshift technique to extract plausible cluster members at $z\sim1.27$ down to $\sim M^\ast+2.5$. 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 ($>$5$\sigma$), in addition to the two known clusters, comprising the largest most distant supercluster ever identified.


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