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Title:
Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging
Authors:
Kodama, Tadayuki; Tanaka, Masayuki; Tamura, Takayuki; Yahagi, Hideki; Nagashima, Masahiro; Tanaka, Ichi; Arimoto, Nobuo; Futamase, Toshifumi; Iye, Masanori; Karasawa, Yoshikazu; Kashikawa, Nobunari; Kawasaki, Wataru; Kitayama, Tetsu; Matsuhara, Hideo; Nakata, Fumiaki; Ohashi, Takaya; Ohta, Kouji; Okamoto, Takashi; Okamura, Sadanori; Shimasaku, Kazuhiro; Suto, Yasushi; Tamura, Naoyuki; Umetsu, Keiichi; Yamada, Toru
Affiliation:
AA(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588), AB(Department of Astronomy, School of Science, The University of Tokyo, Tokyo 113-0033), AC(Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229-8510), AD(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588), AE(Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502), AF(Astronomical Institute, Tohoku University, Aoba-ku, Sendai 980-8578), AG(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588), AH(Astronomical Institute, Tohoku University, Aoba-ku, Sendai 980-8578), AI(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588), AJ(Astronomical Institute, Tohoku University, Aoba-ku, Sendai 980-8578), AK(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588), AL(Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 106, Taiwan), AM(Department of Physics, Toho University, Funabashi, Chiba 274-8510), AN(Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229-8510), AO(Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK), AP(Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397), AQ(Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502), AR(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588; Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK), AS(Department of Astronomy, School of Science, The University of Tokyo, Tokyo 113-0033; Research Center for the Early Universe, School of Science, The University of Tokyo, Tokyo 113-0033), AT(Department of Astronomy, School of Science, The University of Tokyo, Tokyo 113-0033; Research Center for the Early Universe, School of Science, The University of Tokyo, Tokyo 113-0033), AU(Department of Physics, School of Science, The University of Tokyo, Tokyo 113-0033; Research Center for the Early Universe, School of Science, The University of Tokyo, Tokyo 113-0033), AV(Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK), AW(Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 106, Taiwan), AX(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588)
Publication:
Publications of the Astronomical Society of Japan, Vol.57, No.2, pp. 309-323 (PASJ Homepage)
Publication Date:
04/2005
Origin:
PASJ
Keywords:
galaxies: clusters, galaxies: clusters: individual (CL 0939+4713, CL 0016+1609, RX J0152.7-1357), galaxies: evolution
Bibliographic Code:
2005PASJ...57..309K

Abstract

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 × 13 Mpc2 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.
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