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arXiv 1009.0754astro-ph.CO
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100 Mpc尺度上的宇宙学密度涨落及其ISW效应

Cosmological Density Fluctuations on 100Mpc Scales and their ISW Effect

Péter Pápai, István Szapudi

摘要:

我们测量的物质概率分布函数(PDF),通过计数的细胞中的体积有限的子样本的斯隆数字巡天明亮的红色星系目录的尺度从$30 h^{-1}$ Mpc到$150 h^{-1}$ Mpc和估计的线性集成萨克斯-沃尔夫效应产生的超空和超星系团的尾部的PDF。我们的特点的PDF的方差,$S_3$,和$S_4$,并研究在模拟系统的影响,由于有限的体积,调查的形状和红移失真。我们比较我们的测量与预测的$Λ$ CDM与线性偏差,发现一个很好的协议。我们使用的时刻近似的尾部的PDF与解析函数。上层结构的一个简单的高斯模型似乎与Granett等人的主张相一致,即$100 h^{-1}$ Mpc尺度上的密度波动在宇宙微波背景上产生了热点和冷点,其中$ΔT \approx 10μK$。

英文摘要:

We measure the matter probability distribution function (PDF) via counts in cells in a volume limited subsample of the Sloan Digital Sky Survey Luminous Red Galaxy Catalog on scales from $30 h^{-1}$Mpc to $150 h^{-1}$Mpc and estimate the linear Integrated Sachs--Wolfe effect produced by supervoids and superclusters in the tail of the PDF. We characterize the PDF by the variance, $S_3$, and $S_4$, and study in simulations the systematic effects due to finite volume, survey shape and redshift distortion. We compare our measurement to the prediction of $Λ$CDM with linear bias and find a good agreement. We use the moments to approximate the tail of the PDF with analytic functions. A simple Gaussian model for the superstructures appears to be consistent with the claim by Granett et al. that density fluctuations on $100 h^{-1}$Mpc scales produce hot and cold spots with $ΔT \approx 10μK$ on the cosmic microwave background.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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