论文标题
宇宙网络的多个示踪剂之间的相关性
Correlations between multiple tracers of the cosmic web
论文作者
论文摘要
宇宙的大规模结构是互连的簇，细丝和物质片的宇宙网络。该博士学位包括两个补充项目，使用三个不同的示踪剂之间的相关性研究了宇宙网络：宇宙微波背景（CMB），超新星（SNE）和大型类星体组（LQGS）。在第一个项目中，我们重新分析了Yershov，Orlov和Raikov报道的CMB温度与SNE红移之间的明显相关性。他们提供了证据表明，在SNE位置的WMAP/Planck CMB像素 - 温度往往随着红移的增加而增加。他们认为这可能是由综合的萨克斯 - 沃尔夫效应和/或残留的前景污染引起的。我们的分析支持相关性的表面存在，但将其归因于由七个深度调查场与CMB热点的偶然对齐造成的综合选择偏差。这七个字段仅包含SNE样本的9.2％。我们估计它们偶然地落在CMB热点上的可能性约为11分之一。在第二个项目中，我们首次研究了Redshift范围1.0 <= Z <= 1.8的LQG的明显相干对准。我们发现，LQG的位置角度（PA）是相关的，特异性对齐和正交的，在典型的角（共同）分离〜30度（〜1.6 GPC）时，最大显着性约为2.4 Sigma。我们的LQG样品与类星体极化比对区域之间的空间巧合首先报道了Hutsemekers，LQG PAS与Pelgrims和Hutsemekers报告的LQG PAS与无线电极化角度之间的相似性暗示了一个有趣的结果。
The large-scale structure of the Universe is a cosmic web of interconnected clusters, filaments, and sheets of matter. This PhD comprises two complementary projects investigating the cosmic web using correlations between three different tracers: the cosmic microwave background (CMB), supernovae (SNe), and large quasar groups (LQGs). In the first project we re-analyse the apparent correlation between CMB temperature and SNe redshift reported by Yershov, Orlov and Raikov. They presented evidence that the WMAP/Planck CMB pixel-temperatures at SNe locations tend to increase with increasing redshift. They suggest this could be caused by the Integrated Sachs-Wolfe effect and/or by residual foreground contamination. Our analysis supports the prima facie existence of the correlation but attributes it instead to a composite selection bias caused by the chance alignment of seven deep survey fields with CMB hotspots. These seven fields contain just 9.2% of the SNe sample. We estimate the likelihood of their falling on CMB hotspots by chance is approximately 1 in 11. In the second project we investigate for the first time the apparent coherent alignment of LQGs in the redshift range 1.0 <= z <= 1.8. We find that the position angles (PAs) of LQGs are correlated, specifically aligned and orthogonal, with a maximum significance of ~2.4 sigma at typical angular (comoving) separations of ~30 degrees (~1.6 Gpc). Spatial coincidence between our LQG sample and regions of quasar polarization alignment first reported by Hutsemekers, and the similarity between LQG PAs and radio polarization angles reported by Pelgrims and Hutsemekers, suggest an interesting result.
