WISExSuperCOSMOS全天星系表的层析局部二维分析
Tomographic local 2D analyses of the WISExSuperCOSMOS all-sky galaxy catalogue
摘要：
最近在获得更大更深的星系目录方面取得的进展对于宇宙学研究，特别是对于强有力地测量宇宙中的大尺度密度波动具有根本的重要性。本工作使用Minkowski泛函（MF）探测星系密度场从WISExSuperCOSMOS（WSC）的全天表进行层析局部分析在5个红移壳层（厚度$δz = 0.05$）在整个范围内的$0.10 < z < 0.35$。在这里，第一次，MF应用到2D投影的星系数计数（GNC）字段的目的是寻找地区的WSC目录相比，$Λ$ CDM模拟实现的意想不到的功能。我们的方法揭示了每个红移壳层中GNC图的1 - 3个区域具有不寻常的行为（极端区域），即，$p$-值$<$ 1.4\ %。事实上，所得到的MF曲线显示的签名，表明不寻常的行为是与存在的密度过高或过低，但污染由于残留的前景没有被丢弃。此外，即使我们的分析表明数据和模拟之间有很好的一致性，我们也确定了1个高度极端的区域，似乎与星系的大集群分布有关。我们的研究结果证实了MF的有用性分析GNC地图光度星系数据集。
英文摘要：
The recent progress in obtaining larger and deeper galaxy catalogues is of fundamental importance for cosmological studies, especially to robustly measure the large scale density fluctuations in the Universe. The present work uses the Minkowski Functionals (MF) to probe the galaxy density field from the WISExSuperCOSMOS (WSC) all-sky catalogue by performing tomographic local analyses in five redshift shells (of thickness $δz = 0.05$) in the total range of $0.10 < z < 0.35$. Here, for the first time, the MF are applied to 2D projections of the galaxy number count (GNC) fields with the purpose of looking for regions in the WSC catalogue with unexpected features compared to $Λ$CDM mock realisations. Our methodology reveals 1 - 3 regions of the GNC maps in each redshift shell with an uncommon behaviour (extreme regions), i.e., $p$-value $<$ 1.4\%. Indeed, the resulting MF curves show signatures that suggest the uncommon behaviour to be associated with the presence of over- or under-densities there, but contamination due to residual foregrounds is not discarded. Additionally, even though our analyses indicate a good agreement among data and simulations, we identify 1 highly extreme region, seemingly associated to a large clustered distribution of galaxies. Our results confirm the usefulness of the MF to analyse GNC maps from photometric galaxy datasets.
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