标题： 视线方向上星系空间分布的分析在COSMOS2015目录中 显示英文标题

标题： The line-of-sight analysis of spatial distribution of galaxies in the COSMOS2015 catalogue

摘要： 新观测高红移天体对于改进标准$\Lambda$CDM 宇宙学模型和我们对宇宙的理解至关重要。 现代观测宇宙学的主要方向之一是分析宇宙的大尺度结构，特别是深场区域。 我们使用 COSMOS2015 目录的最新版本，沿视线方向研究宇宙的大尺度结构，该目录包含在 COSMOS 区域的光学范围内选出的 518,404 个高质量光度红移的星系（$2\times 2$ deg$^2$），深度达到红移$z \sim 6$。 我们分析沿视线方向星系数量的大尺度涨落，并提供在独立红移区间$ \Delta z = 0.1 $中自相关涨落（结构）的平均线性尺寸估计值，以及从均匀性偏离的标准差（观测到的宇宙方差）的估计值。 我们提出了一种基于先前工作的视线分析新方法，并阐述了该方法进一步发展的前景。 对于理论形式的均匀性近似情况，在$\Lambda$CDM 框架中，从均匀性检测到的结构的平均标准偏差为$ \sigma_\text{mean}^{\Lambda \text{CDM}} = 0.09 \pm 0.02 $，结构的平均特征尺寸为$ R_\text{mean}^{\Lambda \text{CDM}} = 790 \pm 150 $Mpc。 对于经验性的均匀性近似情况，从均匀性检测到的结构的平均标准偏差为$ \sigma_\text{mean}^\text{empiric} = 0.08 \pm 0.01 $，结构的平均特征尺寸为$ R_\text{mean}^\text{empiric} = 640 \pm 140 $Mpc。 显示英文摘要

摘要： New observations of high-redshift objects are crucial for the improvement of the standard $\Lambda$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 $ \Delta z = 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 $\Lambda$CDM framework, the average standard deviation of detected structures from homogeneity is $ \sigma_\text{mean}^{\Lambda \text{CDM}} = 0.09 \pm 0.02 $, and the average characteristic size of structures is $ R_\text{mean}^{\Lambda \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 $ \sigma_\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.