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arXiv 2202.11964astro-ph.CO
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物质聚类对尺度和环境的同时依赖性

Simultaneous Dependence of Matter Clustering on Scale and Environment

Yun Wang, Ping He

摘要:

在这项工作中,我们提出了新的统计工具,能够表征暗物质和气体集群的规模和密度环境的同时依赖性,这些是环境相关的小波功率谱(env-WPS),环境相关的偏置函数(env-bias),和环境相关的小波互相关函数(env-WCC)。这些统计数据被应用到\texttt{TNG100-1}模拟的$z=3.0$ - $0.0$红移处的暗物质和重子气体密度场,以及$z=0$的\texttt{Illustris-1}和\texttt{SIMBA}。对env-WPS的测量表明,暗物质和气体的聚集强度都随着密度的增加而增加,而高斯场的聚集强度没有密度依赖性。通过测量env-bias和env-WCC,我们发现它们随环境、尺度和红移而显著变化。一个值得注意的特征是,在$z=0.0$中,气体在$3 \ h\mathrm{Mpc}^{-1}$周围的$Δ\gtrsim 10$密度更高的环境中偏置更少,这是由于在较低的红移处AGN反馈强度降低导致的气体再吸积。我们还发现,在所有时代,气体与暗物质在最稠密和欠稠密的环境中的相关性都比其他环境更紧密。即使在$z=0$下,在$k \lesssim 10 \ h\mathrm{Mpc}^{-1}$尺度下,$Δ\gtrsim 200$和$Δ\lesssim 0.1$中的env-WCC也大于$0.9$。总之,我们的研究结果支持了局部密度环境对暗物质和气体分布之间的偏差有不可忽视的影响,直到大尺度。

英文摘要:

In this work, we propose new statistical tools that are capable of characterizing the simultaneous dependence of dark matter and gas clustering on the scale and the density environment, and these are the environment-dependent wavelet power spectrum (env-WPS), the environment-dependent bias function (env-bias), and the environment-dependent wavelet cross-correlation function (env-WCC). These statistics are applied to the dark matter and baryonic gas density fields of the \texttt{TNG100-1} simulation at redshifts of $z=3.0$-$0.0$, and to \texttt{Illustris-1} and \texttt{SIMBA} at $z=0$. The measurements of the env-WPSs suggest that the clustering strengths of both the dark matter and the gas increase with increasing density, while that of a Gaussian field shows no density dependence. By measuring the env-bias and env-WCC, we find that they vary significantly with the environment, scale, and redshift. A noteworthy feature is that at $z=0.0$, the gas is less biased in denser environments of $Δ\gtrsim 10$ around $3 \ h\mathrm{Mpc}^{-1}$, due to the gas reaccretion caused by the decreased AGN feedback strength at lower redshifts. We also find that the gas correlates more tightly with the dark matter in both the most dense and underdense environments than in other environments at all epochs. Even at $z=0$, the env-WCC is greater than $0.9$ in $Δ\gtrsim 200$ and $Δ\lesssim 0.1$ at scales of $k \lesssim 10 \ h\mathrm{Mpc}^{-1}$. In summary, our results support the local density environment having a non-negligible impact on the deviations between dark matter and gas distributions up to large scales.

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