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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >GOLDRUSH. III. A systematic search for protoclusters at z similar to 4 based on the 100 deg(2) area
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GOLDRUSH. III. A systematic search for protoclusters at z similar to 4 based on the 100 deg(2) area

机译：淘金热。 III。 系统地搜索z的Protoclusters，其基于＆gt类似于4; 100°（2）区

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摘要

We conduct a systematic search for galaxy protoclusters at z similar to 3.8 based on the latest internal data release (S16A) of the Hyper Suprime-Cam Subaru strategic program (HSC-SSP). In the Wide layer of the HSC-SSP, we investigate the large-scale projected sky distribution of g-dropout galaxies over an area of 121 deg(2), and identify 216 large-scale overdense regions (4 sigma overdensity significance) that are likely protocluster candidates. Of these, 37 are located within 8' (3.4 physical Mpc) of other protocluster candidates of higher overdensity, and are expected to merge into a single massive structure by z = 0. Therefore, we find 179 unique protocluster candidates in our survey. A cosmological simulation that includes projection effects predicts that more than 76% of these candidates will evolve into galaxy clusters with halo masses of at least 10(14) M-circle dot by z = 0. The unprecedented size of our protocluster candidate catalog allows us to perform, for the first time, an angular clustering analysis of the systematic sample of protocluster candidates. We find a correlation length of 35.0 h(-1) Mpc. The relation between correlation length and number density of z similar to 3.8 protocluster candidates is consistent with the prediction of the Lambda CDM model, and the correlation length is similar to that of rich clusters in the local universe. This result suggests that our protocluster candidates are tracing similar spatial structures to those expected from the progenitors of rich clusters, and enhances the confidence that our method for identifying protoclusters at high redshifts is robust. In years to come, our protocluster search will be extended to the entire HSC-SSP Wide sky coverage of similar to 1400 deg(2) to probe cluster formation over a wide redshift range of z similar to 2-6.
机译：我们根据超级Suprime-Cam Subaru战略计划（HSC-SSP）的最新内部数据释放（S16a），对Z的银河原则进行系统搜索。在HSC-SSP的宽层中，我们研究了121°（2）面积的G-Dropout Galaxies的大规模投影天空分布，并识别216个大规模过阵地区（＆ 4 sigma过度密度意义）可能是protocluster候选人。其中37内位于8'（3.4个物理MPC）内，其其他温度较高的候选的候选，并且预计将通过Z = 0融入单个大规模结构中。因此，我们在我们的调查中找到了179个独特的原始候选人。包括投影效果的宇宙学仿真预测，超过76％的这些候选者将从Z = 0中的晕泡肿块的卤素质量扩张成半阵簇。我们的Protocluster候选目录的前所未有的大小允许我们首次执行Protocluster候选系统样本的角聚类分析。我们发现35.0小时（-1）MPC的相关长度。相关长度和z的数量密度与3.8个原生风簇候选的关系与Lambda CDM模型的预测一致，相关长度与本地宇宙中的富簇相似。该结果表明，我们的Protocluster候选者正在将类似的空间结构追踪到富集群的祖细胞的预期的那些，并提高了我们在高射频中识别Protoclusters的方法的信心是强大的。多年来，我们的Protocluster搜索将扩展到整个HSC-SSP宽的天空覆盖范围，类似于1400°（2），以探测群体形成在Z的宽带范围内，类似于2-6。

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