论文标题
COSMOS2015目录中星系空间分布的视线分析
The line-of-sight analysis of spatial distribution of galaxies in the COSMOS2015 catalogue
论文作者
论文摘要
高红移对象的新观察对于改善标准$λ$ CDM宇宙学模型和我们对宇宙的理解至关重要。现代观察性宇宙学的主要方向之一是对宇宙的大规模结构，尤其是在深层领域的分析。我们使用COSMOS2015目录的最新版本沿视线研究了宇宙的大规模结构，其中包含518,404个高质量的光度光度红移，该星系在Cosmos Field的光学系列中选择（$ 2 \ $ 2 \ times times times times times times times times times times times二$ deg $^2 $），可延长到redshift $ z \ sim sim sim ph 6 $ 6 $ 6 $ 6 $ 6 $ 6 $ 6 $ 6 $ 6 $ 6 $ 6 $ 6。我们分析了沿视线的星系数量的大规模波动，并估计了独立的红移bin的自相关波动（结构）的平均线性尺寸（结构），$Δz= 0.1 $以及标准偏差的均匀性估计（均匀性均值）。我们建议一种基于以前的工作的新方法进行视线分析，并制定方法开发的进一步前景。对于$λ$ CDM框架中同质性近似值的理论形式，检测到的结构与均匀性的平均标准偏差为$σ_\ text {mean}^{λ\ text {cdmm}} = 0.09 \ 0.09 \ pm 0.02 $，以及结构的平均特征大小，以及结构的平均特征。 r_ \ text {mean}^{λ\ text {cdm}} = 790 \ pm 150 $ mpc。 For the case of the empirical approximation of homogeneity, the average standard deviation of detected structures from homogeneity is $ σ_\text{mean}^\text{empiric} = 0.08 \pm 0.01 $, and the average characteristic size of structures is $ R_\text{mean}^\text{empiric} = 640 \pm 140 $ Mpc.
New observations of high-redshift objects are crucial for the improvement of the standard $Λ$CDM cosmological model and our understanding of the Universe. One of the main directions of modern observational cosmology is the analysis of the large-scale structure of Universe, in particular, in deep fields. We study the large-scale structure of the Universe along the line of sight using the latest version of the COSMOS2015 catalogue, which contains 518,404 high quality photometric redshifts of galaxies selected in the optical range of the COSMOS field ($2\times 2$ deg$^2$), with depth up to the redshift $z \sim 6$. We analyze large-scale fluctuations in the number of galaxies along the line of sight and provide an estimate of the average linear sizes of the self-correlating fluctuations (structures) in independent redshift bins of $ Δz = 0.1 $ along with the estimate of the standard deviation from homogeneity (the observed cosmic variance). We suggest a new method of the line-of-sight analysis based on previous works and formulate further prospects of method development. For the case of the theoretical form of approximation of homogeneity in the $Λ$CDM framework, the average standard deviation of detected structures from homogeneity is $ σ_\text{mean}^{Λ\text{CDM}} = 0.09 \pm 0.02 $, and the average characteristic size of structures is $ R_\text{mean}^{Λ\text{CDM}} = 790 \pm 150 $ Mpc. For the case of the empirical approximation of homogeneity, the average standard deviation of detected structures from homogeneity is $ σ_\text{mean}^\text{empiric} = 0.08 \pm 0.01 $, and the average characteristic size of structures is $ R_\text{mean}^\text{empiric} = 640 \pm 140 $ Mpc.
