Strong Spatial Clustering of Ultraviolet-selected Galaxies with Magnitude Ks < 20.5 and Redshift z ~ 2
Strong Spatial Clustering of Ultraviolet-selected Galaxies with Magnitude Ks < 20.5 and Redshift z ~ 2
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DOI：
10.1086/428664
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发表时间：
2005-01
期刊：
影响因子：
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通讯作者：
K. Adelberger;D. Erb;C. Steidel;N. Reddy;M. Pettini;A. Shapley
中科院分区：
文献类型：
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作者：
K. Adelberger;D. Erb;C. Steidel;N. Reddy;M. Pettini;A. Shapley
我们得到了deep 8。5 × 8。在4个高红移巡天场的5张近红外（IR）图像中，测量了300个光学选择的光谱红移为1.8≤z≤2.6的星系的Ks等，并比较了Ks为20.5的星系的空间星团强度。我们以95%的可信度发现，越亮的星系聚集得越强烈。明亮和暗淡样本的最佳相关长度分别为10±3和4±0.8 h-1共同移动的Mpc (1 σ)，尽管在我们的一个调查领域中明亮qso的异常密度可能意味着结果不能代表整个宇宙。忽略这种可能性，Ks < 20.5的光学选择样品的相关长度与报道的比较明亮的近红外选择样品的相关长度非常一致。光学选择和近红外选择样品之间的相关长度差异已被提出作为两种技术发现高红移星系正交种群的证据。我们的研究结果支持一种更微妙的观点。
We obtained deep 8.′5 × 8.′5 near-infrared (IR) images within four high-redshift survey fields, measured the Ks magnitudes of 300 optically selected galaxies with spectroscopic redshift 1.8 ≲ z ≲ 2.6, and compared the spatial clustering strength of galaxies with Ks 20.5. We found at greater than 95% confidence that the brighter galaxies cluster more strongly. The best-fit correlation lengths for the bright and faint samples are 10 ± 3 and 4 ± 0.8 h-1 comoving Mpc, respectively (1 σ), although the unusual density of bright QSOs in one of our survey fields may imply that the result is not representative of the universe as a whole. Neglecting this possibility, the correlation length for the optically selected sample with Ks < 20.5 agrees well with that reported for comparably bright near-IR-selected samples. The differences in correlation length between optically selected and near-IR-selected samples have been presented as evidence that the two techniques find orthogonal populations of high-redshift galaxies. Our results favor a more nuanced view.