Sizes of Voids as a Test for Dark Matter Models
Sizes of Voids as a Test for Dark Matter Models
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空洞大小作为暗物质模型的测试
DOI：
10.1086/187685
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. Haynes
中科院分区：
文献类型：
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作者：
S. Ghigna;S. Borgani;S. Bonometto;L. Guzzo;A. Klypin;J. Primack;R. Giovanelli;M. Haynes
我们使用空洞概率统计来研究由英仙座-双鱼座巡天的有限体积子样本所描述的红移空间星系分布。我们将结果与通过再现真实数据集的观测偏差从高分辨率n体模拟中提取的人工样本所实现的相同分析进行了比较。在50 Mpc/h的箱中，对冷+热dm模型（CHDM）和无偏和偏（b=1.5） CDM模型进行了模拟。我们认为星系位于演化的密度场的峰值。我们将过度合并的结构分割成单个星系，以便重现正确的光度函数（在假设所得星系群的M/ L值之后）和两点相关函数。我们的主要结果是，由60%冷、30%热、10%重子组成的标准CHDM模型得到的空洞概率函数（VPF）以高置信度超过了观测的VPF。CDM模型产生较小的VPF，与偏置参数无关。我们在模拟中验证了该结果对观测者位置变化的鲁棒性，并在演化密度场中验证了星系识别。
We use the void probability statistics to study the redshift-space galaxy distribution as described by a volume-limited subsample of the Perseus-Pisces survey. We compare the results with the same analysis realized on artificial samples, extracted from high-resolution N-body simulations by reproducing the observational biases of the real data set. Simulations are run for the Cold+HotDM model (CHDM) and for unbiased and biased (b=1.5) CDM models in a 50 Mpc/h box. We identify galaxies as residing in peaks of the evolved density field. We fragment overmerged structures into individual galaxies so as to reproduce both the correct luminosity function (after assuming M/ L values for the resulting galaxy groups) and the two-point correlation function. Our main result is that a void-probability function (VPF) from the standard CHDM model with fractions 60% cold, 30% hot, 10% barions, exceeds the observational VPF with a high confidence level. CDM models produce smaller VPF independent of the biasing parameter. We verify the robustness of this result against changing the observer position in the simulations and the galaxy identification in the evolved density field.