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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >GOLDRUSH. II. Clustering of galaxies at z ～ 4–6 revealed with the half-million dropouts over the 100?deg2 area corresponding to 1?Gpc3
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GOLDRUSH. II. Clustering of galaxies at z ～ 4–6 revealed with the half-million dropouts over the 100?deg2 area corresponding to 1?Gpc3

机译：淘金热。二。在z〜4–6处星系的聚类表明，在100？deg2区域上对应于1？Gpc3的区域有50万个漏失。

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We present clustering properties from 579492 Lyman-break galaxies (LBGs) at z?～?4–6 over the 100?deg2 sky (corresponding to a 1.4?Gpc3 volume) identified in early data of the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We derive angular correlation functions (ACFs) for the HSC LBGs with unprecedentedly high statistical accuracies at z?～?4–6, and compare them with the halo occupation distribution (HOD) models. We clearly identify significant ACF excesses in 10″??θ??90″, the transition scale between one- and two-halo terms, suggestive of the existence of the non-linear halo bias effect. Combining the HOD models and previous clustering measurements of faint LBGs at z?～?4–7, we investigate the dark matter halo mass (Mh) of the z?～?4–7 LBGs and its correlation with various physical properties including the star formation rate (SFR), the stellar-to-halo mass ratio (SHMR), and the dark matter accretion rate (?|$skew4dot{M}_{,m h}$|?) over a wide mass range of Mh/M⊙ ?=?4?×?1010–4?×?1012. We find that the SHMR increases from z?～?4 to 7 by a factor of ～4 at Mh ? 1?×?1011?M⊙ , while the SHMR shows no strong evolution in the similar redshift range at Mh ? 1?×?1012?M⊙ . Interestingly, we identify a tight relation of SFR|$/skew4dot{M}_{,m h}$|–Mh showing no significant evolution beyond 0.15?dex in this wide mass range over z?～?4–7. This weak evolution suggests that the SFR|$/skew4dot{M}_{,m h}$|–Mh relation is a fundamental relation in high-redshift galaxy formation whose star formation activities are regulated by the dark matter mass assembly. Assuming this fundamental relation, we calculate the cosmic star formation rate densities (SFRDs) over z?=?0–10 (a.k.a. the Madau–Lilly plot). The cosmic SFRD evolution based on the fundamental relation agrees with the one obtained by observations, suggesting that the cosmic SFRD increase from z?～?10 to 4???2 (decrease from z?～?4–2 to 0) is mainly driven by the increase of the halo abundance (the decrease of the accretion rate).
机译：我们介绍了在100 deg2的天空（对应于1.4？Gpc3的体积）上从579492个莱曼断裂星系（LBG）在z？〜？4-6处的聚类性质，该数据在斯巴鲁（Hyper Suprime-Cam）（HSC）早期数据中确定战略计划调查。我们推导了具有在z？〜？4-6处具有前所未有的高统计精度的HSC LBG的角度相关函数（ACF），并将其与光晕占用分布（HOD）模型进行了比较。我们清楚地识别出10“？<？θ？<？90”（一到两个光晕项之间的过渡尺度）中显着的ACF过量，这表明存在非线性光晕偏置效应。结合HOD模型和先前在z？〜？4-7处的微弱LBG的聚类测量，我们研究了z？〜？4-7 LBG的暗物质晕质量（Mh）及其与各种物理性质（包括恒星）的相关性形成速率（SFR），恒星与光晕质量比（SHMR）和暗物质积聚速率（？| $ skew4 dot {M} _ {， rm h} $ |？） Mh /M⊙的质量范围≤4≤4×1010-4≤4×1012。我们发现，在Mh？处，SHMR从z？〜？4增大到7的原因是〜4。 1？×？1011？M⊙，而SHMR在Mh？的相似红移范围内没有强烈的变化。 1××1012×M⊙。有趣的是，我们发现SFR | $ / skew4 dot {M} _ {， rm h} $ | -Mh的紧密关系在z？〜？4的宽质量范围内没有显示出超过0.15？dex的显着变化。 –7。这种微弱的演化表明SFR | $ / skew4 dot {M} _ {， rm h} $ | -Mh关系是高红移星系形成的基本关系，其星形成活动受暗物质调节大规模装配。假设这个基本关系，我们计算z？=？0-10（又称Madau-Lilly图）上的宇宙星形成率密度（SFRD）。基于基本关系的宇宙SFRD演化与通过观测得出的结果一致，表明宇宙SFRD从z？〜？10增加到4 ??? 2（从z？〜？4-2减少到0）主要是受到光环丰度增加（积聚率降低）的驱动。

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