The Oxford-Dartmouth Thirty Degree Survey - II. Clustering of bright Lyman break galaxies: strong lu
The Oxford-Dartmouth Thirty Degree Survey - II. Clustering of bright Lyman break galaxies: strong lu
复制标题
牛津-达特茅斯三十度调查 - II。
DOI：
10.1111/j.1365-2966.2005.09161.x
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发表时间：
2005
影响因子：
4.8
通讯作者：
G. Wegner
中科院分区：
文献类型：
--
作者：
P. Allen;L. Moustakas;G. Dalton;E. Macdonald;C. Blake;L. Clewley;C. Heymans;G. Wegner
本文测量了从牛津-达特茅斯三十度巡天（ODT）中选出的明亮（L > L *）z ≥ 4莱曼破裂星系（LBG）的成团性质.我们描述了用于选择和评估我们的候选者并计算角相关函数的技术，我们发现该角相关函数最适合幂律，ω（θ）= A w θ -β，其中A w = 15.4（0以arcsec为单位），使用β = 0.8的约束斜率。利用与光度模型一致的红移分布，我们对这个关联函数进行了反投影，在Ω m = 0.3的平坦A宇宙学中，当iAB ≤ 24.5时，发现了一个共动r 0 = 11.4 + 1.7 - 1.9h-1100 Mpc.这对应于线性偏差值b = 8.1 +2.0 -2.6（假设σ 8 = 0.9）。B = 8.1 +2.0-2.6。这些数据表明，在z = 4时，r 0和B显著大于先前的研究。我们解释这作为证据，最亮的LBG有一个更大的偏差比较暗的，表明一个强大的光度依赖的LBG样品的测量偏差。比较这对最近的结果在文献中较暗（subL *）的限制幅度，并与简单的模型描述LBG和暗物质晕之间的关系，我们讨论了隐含的环境和性质的LBG的影响。看起来最亮的LBG（与大多数subL * 群体相比）具有聚集特性，并且拥有暗物质晕质量，这与它们是当今最大质量星系的祖先是一致的。
We present measurements of the clustering properties of bright (L > L * ) z ∼ 4 Lyman break galaxies (LBGs) selected from the Oxford-Dartmouth Thirty Degree Survey (ODT). We describe techniques used to select and evaluate our candidates and calculate the angular correlation function, which we find best fitted by a power law, ω(θ) = A w θ -β with A w = 15.4 (with 0 in arcsec), using a constrained slope of β = 0.8. Using a redshift distribution consistent with photometric models, we deproject this correlation function and find a comoving r 0 = 11.4 +1.7 -1.9 h -1 100 Mpc in a Ω m = 0.3 flat A cosmology for i AB ≤ 24.5. This corresponds to a linear bias value of b = 8.1 +2.0 -2.6 (assuming σ 8 = 0.9). These data show a significantly larger r 0 and b than previous studies at z ∼ 4. We interpret this as evidence that the brightest LBGs have a larger bias than fainter ones, indicating a strong luminosity dependence for the measured bias of an LBG sample. Comparing this against recent results in the literature at fainter (subL * ) limiting magnitudes, and with simple models describing the relationship between LBGs and dark matter haloes, we discuss the implications on the implied environments and nature of LBGs. It seems that the brightest LBGs (in contrast with the majority subL * population) have clustering properties, and host dark matter halo masses, which are consistent with them being progenitors of the most massive galaxies today.