论文标题
高红移Lyman-Alpha发射器的模拟调查的空隙概率函数
Void Probability Function of Simulated Surveys of high-redshift Lyman-Alpha Emitters
论文作者
论文摘要
我们在宽阔的红移范围内($ z = 3.1,\ 4.5,\ 5.7,\ 6.6 $)中计算了Lyman- $α$发射器(LAES)模拟中的空隙概率函数(VPF)。 VPF测量零点相关函数(即放置没有星系),并且自然连接到高阶相关函数,同时计算易于计算。我们探索VPF上的泊松和系统误差,指定其准确性作为平均源密度的函数和探测的音量,并提供适当的尺寸尺度以测量VPF。在小半径下,VPF的精度受到星系密度的限制,而在大半径下,VPF受到探测的独立体积的数量的限制。我们还提供了理解和量化VPF中错误的准则。在发现折刀统计数据低估了不确定性之后,我们通过使用目录的独立子卷来近似VPF中的误差。我们使用VPF通过使用计数中的计数来测量和检查相关函数之间的层次缩放来探测高阶相关函数的强度。已经显示出负二项式模型(NBM)可以最好地描述低降射星系观测的两个点相关函数与VPF之间的缩放率。我们通过直接从VPF得出的音量平均两点相关函数来进一步测试NBM的拟合,反之亦然。我们发现NBM最能描述$ z = 3.1、4.5、5.7 $模拟的Laes,在$ z = 6.6 $目录中与模型的1 $σ$偏差。这表明LAE显示了与正常低红移星系相似的高阶聚类术语。
We calculate the void probability function (VPF) in simulations of Lyman-$α$ emitters (LAEs) across a wide redshift range ($z=3.1,\ 4.5,\ 5.7,\ 6.6$). The VPF measures the zero-point correlation function (i.e. places devoid of galaxies) and naturally connects to higher order correlation functions while being computationally simple to calculate. We explore the Poissonian and systematic errors on the VPF, specify its accuracy as a function of average source density and the volume probed, and provide the appropriate size scales to measure the VPF. At small radii the accuracy of the VPF is limited by galaxy density, while at large radii the VPF is limited by the number of independent volumes probed. We also offer guidelines for understanding and quantifying the error in the VPF. We approximate the error in the VPF by using independent sub-volumes of the catalogs, after finding that jackknife statistics underestimate the uncertainty. We use the VPF to probe the strength of higher order correlation functions by measuring and examining the hierarchical scaling between the correlation functions using count-in-cells. The negative binomial model (NBM) has been shown to best describe the scaling between the two point correlation function and VPF for low-redshift galaxy observations. We further test the fit of the NBM by directly deriving the volume averaged two-point correlation function from the VPF and vice versa. We find the NBM best describes the $z=3.1, 4.5, 5.7$ simulated LAEs, with a 1$σ$ deviation from the model in the $z=6.6$ catalog. This suggests that LAEs show higher order clustering terms similar to those of normal low redshift galaxies.