Panoramic views of cluster-scale assemblies explored by subaru wide-field imaging

Tadayuki Kodama, Masayuki Tanaka, Takayuki Tamura, Hideki Yahagi, Masahiro Nagashima, Ichi Tanaka, Nobuo Arimoto, Toshifumi Futamase, Masanori Iye, Yoshikazu Karasawa, Nobunari Kashikawa, Wataru Kawasaki, Tetsu Kitayama, Hideo Matsuhara, Fumiaki Nakata, Takaya Ohashi, Kouji Ohta, Takashi Okamoto, Sadanori Okamura, Kazuhiro ShimasakuYasushi Suto, Naoyuki Tamura, Keiichi Umetsu, Toru Yamada

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


We have started PISCES project; a panoramic imaging and spectroscopic survey of distant clusters on Subaru. It exploits the unique wide-field imaging capability of Suprime-Cam, which provides a 34′ × 27′ field of view corresponding to a physical area of 16 × 13Mpc2 at z ∼ 1. We plan to target 15 clusters at 0.4 ≲ z ≲ 1.3. We report on our first results concerning the inner structures and large-scale structures of two distant clusters at z = 0.55 and 0.83 together with the earlier results on a z = 0.41 cluster. The photometric redshift technique has been applied to multi-color data in order to remove most of the foreground/background galaxies so as to isolate the cluster member candidates. We have found large-scale filamentary structures around the clusters, extending out to > 5 Mpc from the cores, as well as complex inner structures. The galaxy distributions in the inner regions of the clusters look similar to the X-ray intensity maps, suggesting that most of the optical structures trace physically bound systems. We also compared the structures of the three clusters with those of model clusters in a numerical simulation (N-body + semi-analytic model) by parameterising the shapes of the iso-density contours of galaxies, and found a broad agreement. Our results that cluster-scale assembly takes place along filaments during hierarchical clustering need to be confirmed spectroscopically in the near future.

Original languageEnglish
Pages (from-to)309-323
Number of pages15
JournalPublication of the Astronomical Society of Japan
Issue number2
Publication statusPublished - 2005


  • Galaxies: clusters
  • Galaxies: evolution


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