Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging

Details Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging

2005-02-22

arxiv.org/abs/astro-ph/0502444v2

Astronomy and Astrophysics

Astrophysics

14 pages, 12 figures (of which 5 are provided in jpg format), uses pasj00.cls. PASJ in press. Proof corrected. Error in Fig.3

Scientific paper

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'x27' field of view corresponding to a physical area of 16x13Mpc^2 at z~1. We plan to target 15 clusters in total at 0.45Mpc 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 provide good evidence that cluster-scale assembly takes place along filaments during hierarchical clustering, while the structures found here need to be confirmed spectroscopically in the near future.

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