Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging
Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging
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DOI：
10.1093/pasj/57.2.309
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发表时间：
2005-02
影响因子：
2.3
通讯作者：
T. Kodama;the Pisces team
中科院分区：
文献类型：
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作者：
T. Kodama;the Pisces team
我们已经开始了PISCES项目;斯巴鲁上遥远星系团的全景成像和光谱调查。它利用了Suprime-Cam独特的宽视场成像能力，提供了34 × 27的视场，对应于z = 1时16 × 13 Mpc 2的物理区域。我们计划以0.4 z 1.3的15个集群为目标。我们报告我们的第一个结果，关于内部结构和大尺度结构的两个遥远的星系团在z = 0.55和0.83与早期的结果在z = 0.41集群。测光红移技术已被应用到多色数据，以消除大部分的前景/背景星系，从而隔离的集群成员候选人。我们已经发现了大规模的星系团周围的结构，从核心延伸到> 5 Mpc，以及复杂的内部结构。星系团内部区域的星系分布看起来与X射线强度图相似，这表明大多数光学结构都是物理束缚系统的痕迹。我们还比较了三个星系团的结构与模型星系团在数值模拟（N体+半解析模型）通过参数化的星系等密度轮廓的形状，并发现了广泛的协议。我们的研究结果，集团规模的组装发生沿着丝在分级聚类需要在不久的将来证实光谱。
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 ×13Mpc 2 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 > 5Mpc 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.