In:
Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 57, No. 2 ( 2005-04-25), p. 309-323
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 $34^{\prime} \times 27^{\prime}$ field of view corresponding to a physical area of $16 \times 13 \,\mathrm{Mpc}^2$ at $z \sim 1$. We plan to target 15 clusters at $0.4 \lesssim z \lesssim 1.3$. 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 $\gt 5 \,\mathrm{Mpc}$ 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.
Type of Medium:
Online Resource
ISSN:
0004-6264
,
2053-051X
DOI:
10.1093/pasj/57.2.309
Language:
English
Publisher:
Oxford University Press (OUP)
Publication Date:
2005
detail.hit.zdb_id:
2206640-8
detail.hit.zdb_id:
2083084-1
SSG:
16,12
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