论文标题
Illustristng模拟中的subhaloes计数：Baryonic物理学的作用
Counts-in-Cells of subhaloes in the IllustrisTNG simulations: the role of baryonic physics
论文作者
论文摘要
我们介绍了在公开可用的Illustristng宇宙学模拟（TNG100-1，TNG100-3和TNG300-3）中对计数（CIC）统计的分析，考虑到它们的完整且仅黑暗的版本，在$ z = 0 $ z = 0 $ z = 5 $和不同的小区和不同的小区中。我们评估了两个CIC模型：重力准平衡分布（GQED）和负二项式分布（NBD），两者都具有良好的拟合度，在Baryons存在下具有很小的可检测差异。与文献相比，最佳拟合参数的缩放和时间依赖性显示出相似的趋势。我们得出了与GQED相关的物质密度概率分布函数（PDF），该功能与Uhlemann等人中给出的PDF进行了比较。 （2016年），对于Illustristng 100-3-Dark以$ z = 0 $运行。我们的结果表明，在存在Baryonic耗散的情况下，GQED模型的最简单的重量模型假设。有趣的是，GQED的平滑（密度中）版本也足以描述subhaloes和comlemes的暗物质一分点统计，并将其汇聚到次级级别（对于参数的间隔）到Uhlemann等人。 PDF在高密度范围内。
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-fit 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 given in Uhlemann et al. (2016), 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.
