The Uchuu simulations: Data Release 1 and dark matter halo concentrations
The Uchuu simulations: Data Release 1 and dark matter halo concentrations
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DOI：
10.1093/mnras/stab1755
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发表时间：
2021-08-03
影响因子：
4.8
通讯作者：
Vega-Martinez, Cristian A.
中科院分区：
文献类型：
--
作者：
Ishiyama, Tomoaki;Prada, Francisco;Vega-Martinez, Cristian A.
我们介绍了大型高分辨率宇宙N体模拟的Uchuu套件。最大的模拟名为Uchuu，由2.1万亿(12800(3))个暗物质粒子组成，位于边长为2.0h(-1)的GPC盒中，粒子质量为3.27×10(8)h(-1)M圆点。最高分辨率的模拟，Shin-Uchuu，由2620亿(6400(3))个粒子组成，在一个边长为140h(-1)MPC的盒子中，粒子质量为8.97×10(5)h(-1)M圆点。结合这些模拟，我们可以跟踪暗物质光晕和次光晕的演变，跨越那些拥有矮小星系的大质量星系团，其体积是前所未有的。在第一篇文章中，我们介绍了基本统计、暗物质功率谱以及晕和次晕质量函数，它们展示了乌楚族的宽动态范围和极好的统计特性。通过对功率谱演化的分析，我们得出的结论是，我们的模拟从重子声振荡到很小的尺度都是准确的。我们还提供了质量浓度模型的参数，该模型描述了晕浓度的演化，并对红移为0的质量跨度近8个数量级的晕的模拟数据重现到5%以内。
We introduce the Uchuu suite of large high-resolution cosmological N-body simulations. The largest simulation, named Uchuu, consists of 2.1 trillion (12 800(3)) dark matter particles in a box of side-length 2.0 h(-1) Gpc, with particle mass of 3.27 x 10(8) h(-1) M-circle dot. The highest resolution simulation, Shin-Uchuu, consists of 262 billion (6400(3)) particles in a box of side-length 140 h(-1) Mpc, with particle mass of 8.97 x 10(5) h(-1) M-circle dot. Combining these simulations, we can follow the evolution of dark matter haloes and subhaloes spanning those hosting dwarf galaxies to massive galaxy clusters across an unprecedented volume. In this first paper, we present basic statistics, dark matter power spectra, and the halo and subhalo mass functions, which demonstrate the wide dynamic range and superb statistics of the Uchuu suite. From an analysis of the evolution of the power spectra, we conclude that our simulations remain accurate from the baryon acoustic oscillation scale down to the very small. We also provide parameters of a mass-concentration model, which describes the evolution of halo concentration and reproduces our simulation data to within 5 per cent for haloes with masses spanning nearly eight orders of magnitude at redshift 0