Statistics of the Sunyaev–Zel'dovich effect power spectrum
Statistics of the Sunyaev–Zel'dovich effect power spectrum
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Sunyaev-Zeldovich 效应功率谱统计
DOI：
10.1111/j.1365-2966.2009.15121.x
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发表时间：
2009
影响因子：
4.8
通讯作者：
S. Kay
中科院分区：
文献类型：
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作者：
M. Peel;R. Battye;S. Kay
使用大量的模拟的微波天空，结合宇宙微波背景（CMB）和Sunyaev-Zel'dovich（SZ）的效果，由于集群，我们调查的统计功率谱在微波频率之间的球形多极1000和10000。从这些虚拟的天空地图，我们发现，SZ效应的频谱具有比纯高斯实现所预期的大3倍的标准偏差，并且具有明显向更高值倾斜的分布，特别是当使用小地图尺寸时。由于星系团的聚集，与三光谱计算相比，标准差也增加了约10%。我们还考虑了包括剩余点源和气体物理中的不确定性的影响。这对宇宙背景成像仪（CBI）和伯克利-伊利诺伊-马里兰州协会（比马）实验在CMB功率谱中测量的过剩功率有影响。我们的研究结果表明，观察到的过量可以用比以前建议的σ 8值更低的值来解释，但是这种影响不足以匹配σ 8 = 0.825。气体物理学的不确定性也可能发挥重要作用。我们已经在网上提供了SZ效应的地图。
Using large numbers of simulations of the microwave sky, incorporating the cosmic microwave background (CMB) and the Sunyaev-Zel'dovich (SZ) effect due to clusters, we investigate the statistics of the power spectrum at microwave frequencies between spherical multipoles of 1000 and 10000. From these virtual sky maps, we find that the spectrum of the SZ effect has a larger standard deviation by a factor of 3 than would be expected from purely Gaussian realizations, and has a distribution that is significantly skewed towards higher values, especially when small map sizes are used. The standard deviation is also increased by around 10 per cent compared to the trispectrum calculation due to the clustering of galaxy clusters. We also consider the effects of including residual point sources and uncertainties in the gas physics. This has implications for the excess power measured in the CMB power spectrum by the Cosmic Background Imager (CBI) and Berkeley-Illinois-Maryland Association (BIMA) experiments. Our results indicate that the observed excess could be explained using a lower value of σ 8 than previously suggested, however the effect is not enough to match σ 8 = 0.825. The uncertainties in the gas physics could also play a substantial role. We have made our maps of the SZ effect available online.
M.Takeda 等人：“明野巨型空气簇射阵列实验中的能量测定”天体粒子物理学。
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