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首页> 外文期刊>The Astrophysical journal >DEFINITIVE IDENTIFICATION OF THE TRANSITION BETWEEN SMALL- AND LARGE-SCALE CLUSTERING FOR LYMAN BREAK GALAXIES
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DEFINITIVE IDENTIFICATION OF THE TRANSITION BETWEEN SMALL- AND LARGE-SCALE CLUSTERING FOR LYMAN BREAK GALAXIES

机译：莱曼断裂星系的小集群和大集群之间转换的权威性识别

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摘要

We present an angular correlation function (ACF) of z = 4 LBGs with unprecedented statistical quality, based on measurements of 16,920 LBGs obtained in the 1 deg sky of the Subaru/XMM-Newton Deep Field. The ACF significantly departs from a power law, and shows an excess on small scales. In particular, the ACFs of LBGs with i′ < 27.5 show a clear break between the small- and large-scale regimes at an angular separation of approx= 7″, whose projected length corresponds to the virial radius of dark halos with a mass of 10~(11)-10~(12) solar mass, indicating multiple LBGs residing in a single dark halo. At both small (2″ < θ < 3″) and large (40″ < θ < 400″) scales, clustering amplitudes increase monotonically with luminosity for the magnitude range of i′ = 24.5-27.5; the small-scale clustering shows a stronger luminosity dependence than the large-scale clustering. The small-scale bias reaches b approx= 10-50, and the outskirts of small-scale excess extend to a larger angular separation for brighter LBGs. The ACF and number density of LBGs can be explained by the cold dark matter model.
机译：基于在斯巴鲁/ XMM-牛顿深场的1度天空中获得的16,920个LBG的测量结果，我们提出了z = 4个LBG的角相关函数（ACF），具有前所未有的统计质量。 ACF明显偏离幂律，并且在小范围内显示出过量。尤其是，i'<27.5的LBG的ACF在小间距和大尺寸范围之间明显分开，其角度间隔约为= 7英寸，其投影长度对应于质量为的暗晕的病毒半径。 10〜（11）-10〜（12）太阳质量，表明多个LBG驻留在单个暗光环中。在小（2” <θ<3”）和大（40” <θ<400”）尺度下，对于i'= 24.5-27.5的幅度范围，聚类幅度都随亮度单调增加。与大规模聚类相比，小聚类显示出更强的光度依赖性。小规模的偏差达到b大约= 10-50，小规模多余的郊区扩展到更大的角度间隔，以实现更明亮的LBG。 LBG的ACF和数量密度可以通过冷暗物质模型来解释。

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