通过WMAP-NVSS相关性对综合Sachs-Wolfe效应证据的再评价
A reassessment of the evidence of the Integrated Sachs-Wolfe effect through the WMAP-NVSS correlation
摘要：
我们重新评估了NRAO VLA巡天（NVSS）射电源的空间分布与威尔金森微波各向异性探测器（WMAP）的宇宙微波背景（CMB）各向异性的互相关估计。这种重新分析的动机是，大多数以前的研究采用了红移分布的NVSS源与最近的数据不一致。我们发现，由观测到的角关联函数w（θ）设置的NVSS源的偏置加权红移分布b（z）xN（z）的约束，强烈地减轻了N（z）的选择的影响。如果满足这样的限制，即使是高度不一致的红移分布产生NVSS-WMAP交叉关联函数彼此一致的统计误差。最近数据所支持的模型意味着偏差因子b（z）随着z的增加而减少，而不是像大多数以前的分析所假设的那样保持不变。因此，函数b（z）xN（z）在z<1时具有更大的权重，即在标准Lambda CDM宇宙学中对ISW产生最大贡献的红移范围内。总的来说，NVSS比通常认为的更适合于ISW研究，即使在没有观测确定红移分布的情况下。NVSS-WMAP交叉关联函数与标准Lambda CDM宇宙学的预测完全一致。
英文摘要：
We reassess the estimate of the cross-correlation of the spatial distribution of the NRAO VLA Sky Survey (NVSS) radio sources with that of Cosmic Microwave Background (CMB) anisotropies from the Wilkinson Microwave Anisotropy Probe (WMAP). This re-analysis is motivated by the fact that most previous studies adopted a redshift distribution of NVSS sources inconsistent with recent data. We find that the constraints on the bias-weighted redshift distribution, b(z)xN(z), of NVSS sources, set by the observed angular correlation function, w(theta), strongly mitigate the effect of the choice of N(z). If such constraints are met, even highly discrepant redshift distributions yield NVSS-WMAP cross-correlation functions consistent with each other within statistical errors. The models favoured by recent data imply a bias factor, b(z), decreasing with increasing z, rather than constant, as assumed by most previous analyses. As a consequence, the function b(z)xN(z) has more weight at z<1, i.e. in the redshift range yielding the maximum contribution to the ISW in a standard LambdaCDM cosmology. On the whole, the NVSS turns out to be better suited for ISW studies than generally believed, even in the absence of an observational determination of the redshift distribution. The NVSS-WMAP cross-correlation function is found to be fully consistent with the prediction of the standard LambdaCDM cosmology.
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