Galaxy Clustering in the Mira-Titan Universe. I. Emulators for the Redshift Space Galaxy Correlation Function and Galaxy

DOI：

10.3847/1538-4357/acd92f

发表时间：

2023-02

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

J. Kwan;S. Saito;A. Leauthaud;K. Heitmann;Salman Habib;N. Frontiere;Hong Guo;Song Huang;A. Pope;Sergio Rodr'iguez-Torres

基于光晕占位分布模型，构建了投影和红移空间星系相关函数和星系-星系透镜测量的多余表面密度的精确仿真器。使用完整的Mira-Titan套件111个n -体模拟，我们的模拟器在8个宇宙学参数上变化，包括中微子质量和动态暗能量的影响。我们证明了我们的模拟器在0.5≤r≤50 h−1 Mpc范围内足够精确地分析重子振荡光谱调查DR12 CMASS星系样本。此外，我们证明了我们的模拟器能够从相同范围内的真实模拟目录中恢复无偏宇宙学约束。我们的模拟星表测试表明，将小尺度星系-星系透镜效应与红移空间聚类相结合是有效的，并且我们可以将增长率和σ 8分别限制为7%和4.5%，对于一个cmass样例，仅使用我们的模拟器覆盖的测量。加上在H 0之前的宇宙微波背景，这降低到2%的增长率测量值。

We construct accurate emulators for the projected and redshift space galaxy correlation functions and excess surface density as measured by galaxy–galaxy lensing, based on halo occupation distribution modeling. Using the complete Mira-Titan suite of 111 N-body simulations, our emulators vary over eight cosmological parameters and include the effects of neutrino mass and dynamical dark energy. We demonstrate that our emulators are sufficiently accurate for the analysis of the Baryon Oscillation Spectroscopic Survey DR12 CMASS galaxy sample over the range 0.5 ≤ r ≤ 50 h −1 Mpc. Furthermore, we show that our emulators are capable of recovering unbiased cosmological constraints from realistic mock catalogs over the same range. Our mock catalog tests show the efficacy of combining small-scale galaxy–galaxy lensing with redshift space clustering and that we can constrain the growth rate and σ 8 to 7% and 4.5%, respectively, for a CMASS-like sample using only the measurements covered by our emulator. With the inclusion of a cosmic microwave background prior on H 0, this reduces to a 2% measurement of the growth rate.

Galaxy Clustering in the Mira-Titan Universe. I. Emulators for the Redshift Space Galaxy Correlation Function and Galaxy–Galaxy Lensing

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