arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.05982astro-ph.GAastro-ph.CO
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在IllustrisTNG模拟中亚晕的胞内计数:重子物理学的作用

Counts-in-Cells of subhaloes in the IllustrisTNG simulations: the role of baryonic physics

Christine C. Dantas

摘要:

我们提出了一个分析的计数在细胞(CiC)统计的subhaloes在公开可用的IllustrisTNG宇宙学模拟(TNG 100 -1,TNG 100 -3和TNG 300 -3),考虑其完整和黑暗的版本,在红移范围从$z = 0$到$z=5$,和不同的细胞大小。我们评估了两种CiC模型:引力准平衡分布(GQED)和负二项分布(NBD),两者都呈现出良好的拟合,在重子的存在下具有小的可检测的差异。与文献相比,最佳拟合参数的缩放和时间依赖性显示出类似的趋势。我们推导出了与GQED相关的细胞内物质密度概率分布函数(PDF),并将其与Uhlemann等人(2016)在$z=0$运行的IllustrisTNG 100-3-Dark中给出的PDF进行了比较。我们的结果表明,在重子耗散存在的情况下,GQED模型最简单的引力假设成立。有趣的是,平滑(密度在细胞)版本的GQED也足以描述的暗物质单点统计的subhaloes和收敛,subpercentage水平(参数的间隔),在高密度范围内的Uhlemann等人的PDF。

英文摘要:

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.

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