Uchuu-SDSS星系光锥：成簇、RSD和BAO研究
The Uchuu-SDSS galaxy lightcones: a clustering, RSD and BAO study
摘要：
本文给出了Uchuu-SDSS星系的数据发布：一组由2.1万亿Uchuu粒子$N$ -体模拟构建的32个高保真星系光锥。我们采用次晕丰度匹配填充Uchuu-box晕目录与SDSS星系光度。这些立方盒星系目录产生的几个红移相结合，以创建一套光锥红移演变的星系属性。Uchuu-SDSS星系光锥的建造是为了重现SDSS主要星系调查的足迹和统计特性，以及恒星质量和恒星形成率。这有助于直接比较观测到的SDSS和模拟的Uchuu-SDSS数据。我们的光锥再现了大量的观测结果，如星系性质的分布，星系团，恒星质量函数，晕占领分布。利用模拟和实际数据，我们选择了明亮的红色星系的样本在$z_\mathrm{eff}=0.15$探索红移空间畸变和重子声振荡（BAO）利用一个完整的形状分析模型的两点相关函数。我们创建了一组5100星系光锥使用GLAM N体模拟计算协方差误差。我们报告了$\sim 30\%$的精度增加$fσ_8$，由于我们更好地估计的协方差矩阵。从我们的BAO推断的$α_{\parallel}$和$α_{\perp}$参数，我们获得了哈勃和角直径距离$D_\mathrm{H}(z=0.15) / r_d = 27.9^{+3.1}_{-2.7}$，$D_\mathrm{M}(z=0.15) / r_d = 5.1^{+0.4}_{-0.4}$的第一个SDSS测量。总体而言，我们的结论是普朗克LCDM宇宙学很好地解释了观测到的SDSS的大尺度结构统计。所有数据集都公开提供。
英文摘要：
We present the data release of the Uchuu-SDSS galaxies: a set of 32 high-fidelity galaxy lightcones constructed from the large Uchuu 2.1 trillion particle $N$-body simulation using Planck cosmology. We adopt subhalo abundance matching to populate the Uchuu-box halo catalogues with SDSS galaxy luminosities. These cubic box galaxy catalogues generated at several redshifts are combined to create the set of lightcones with redshift-evolving galaxy properties. The Uchuu-SDSS galaxy lightcones are built to reproduce the footprint and statistical properties of the SDSS main galaxy survey, along with stellar masses and star formation rates. This facilitates direct comparison of the observed SDSS and simulated Uchuu-SDSS data. Our lightcones reproduce a large number of observational results, such as the distribution of galaxy properties, the galaxy clustering, the stellar mass functions, and the halo occupation distributions. Using the simulated and real data we select samples of bright red galaxies at $z_\mathrm{eff}=0.15$ to explore Redshift Space Distortions and Baryon Acoustic Oscillations (BAO) utilizing a full-shape analytical model of the two-point correlation function. We create a set of 5100 galaxy lightcones using GLAM N-body simulations to compute covariance errors. We report a $\sim 30\%$ precision increase on $fσ_8$, due to our better estimate of the covariance matrix. From our BAO-inferred $α_{\parallel}$ and $α_{\perp}$ parameters, we obtain the first SDSS measurements of the Hubble and angular diameter distances $D_\mathrm{H}(z=0.15) / r_d = 27.9^{+3.1}_{-2.7}$, $D_\mathrm{M}(z=0.15) / r_d = 5.1^{+0.4}_{-0.4}$. Overall, we conclude that the Planck LCDM cosmology nicely explains the observed large-scale structure statistics of SDSS. All data sets are made publicly available.
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