论文标题
来自SDSS主样本的单元格中的星系偏差和$σ_8$
Galaxy Bias and $σ_8$ from Counts in Cells from the SDSS Main Sample
论文作者
论文摘要
计数中的计数（CIC）星系概率分布取决于暗物质聚类振幅$σ_8$和GALAXY偏见$ B $。我们基于基于潜在的暗物质分布的先前处方以及向红移空间的线性体积转换提供了CIC分布的理论。我们表明，与功率谱不同，CIC分布在大尺度上打破了$σ_8$和$ b $之间的变性，以至于偏置和红移扭曲仍然是线性的。因此，我们获得两个参数的同时拟合。我们首先验证千年模拟中的技术，然后将其应用于SDSS主星系样品。我们发现$σ_8= 0.94^{+。11} _ { - 。10} $和$ b = 1.36^{+。14} _ { - 。11} $，与先前来自Redshift Towrortions的互补结果以及Planck的互补结果一致。
The counts-in-cells (CIC) galaxy probability distribution depends on both the dark matter clustering amplitude $σ_8$ and the galaxy bias $b$. We present a theory for the CIC distribution based on a previous prescription of the underlying dark matter distribution and a linear volume transformation to redshift space. We show that, unlike the power spectrum, the CIC distribution breaks the degeneracy between $σ_8$ and $b$ on scales large enough that both bias and redshift distortions are still linear; thus we obtain a simultaneous fit for both parameters. We first validate the technique on the Millennium Simulation and then apply it to the SDSS Main Galaxy Sample. We find $σ_8 = 0.94^{+.11}_{-.10}$ and $b = 1.36^{+.14}_{-.11}$, consistent with previous complementary results from redshift distortions and from Planck.
