We present an analysis of the counts-in-cells (CiC) statistics of subhaloes in the publicly available IllustrisTNG cosmological simulations (TNG100-1, TNG100-3, and TNG300-3), considering their full and dark-only versions, in redshifts ranging from z = 0 to z = 5, and different cell sizes. We evaluated two CiC models: the gravitational quasi-equilibrium distribution (GQED) and the negative binomial distribution (NBD), both presenting good fits, with small detectable differences in the presence of baryons. Scaling and time dependencies of the best-fitting parameters showed similar trends compared with the literature. We derived a matter density-in-cells probability distribution function (PDF), associated with the GQED, which was compared to the PDF proposed by Uhlemann et al., for the IllustrisTNG 100-3-Dark run at z = 0. Our results indicate that the simplest gravithermodynamical assumptions of the GQED model hold in the presence of baryonic dissipation. Interestingly, the smoothed (density-in-cells) version of the GQED is also adequate for describing the dark matter one-point statistics of subhaloes and converges, to subpercentage levels (for an interval of parameters), to the Uhlemann et al. PDF in the high density range.

中文翻译：

---

IllustrisTNG 模拟中亚晕的细胞计数：重子物理学的作用

我们分析了公开可用的 IllustrisTNG 宇宙学模拟（TNG100-1、TNG100-3 和 TNG300-3）中亚晕的细胞计数 (CiC) 统计数据，考虑到它们的完整版本和纯暗版本，红移范围从 z = 0 到 z = 5，以及不同的像元大小。我们评估了两个 CiC 模型：引力准平衡分布 (GQED) 和负二项分布 (NBD)，两者都表现出良好的拟合度，在重子的存在下可检测到的差异很小。与文献相比，最佳拟合参数的尺度和时间依赖性显示出相似的趋势。我们导出了与 GQED 相关的细胞内物质密度概率分布函数 (PDF)，该函数与 Uhlemann 等人提出的 PDF 进行了比较，用于 IllustrisTNG 100-3-Dark 在 z = 0 时的运行。我们的结果表明，GQED 模型的最简单的重力热力学假设在存在重子耗散的情况下成立。有趣的是，GQED 的平滑（单元内密度）版本也足以描述暗物质的暗物质单点统计亚晕和收敛到亚百分比水平（对于参数间隔），Uhlemann 等人。高密度范围内的 PDF。