标题： Sunyaev-Zeldovich效应的流体力学模拟：地图与低阶统计 显示英文标题

标题： Sunyaev-Zeldovich effect from hydrodynamical simulations: maps and low order statistics

摘要： 我们使用移动网格流体动力学模拟制作了太阳泽尔多维奇效应的地图。我们展示了几个宇宙学模型的这些地图，并探讨了它们的最低矩。我们发现第一个矩，平均康普顿 $y$ 参数，通常在集群丰度归一化模型中位于 $1-2\times 10^{-6}$ 之间，较小的值对应于高密度模型，并且按 $\sigma_8^{3-4}$ 比例变化。10'尺度上的均方根波动在雷利-金斯区域具有 $ \Delta T/T \sim 1-3 \times 10^{-6}$ 的振幅。功率谱的振幅强烈依赖于功率谱归一化并且按 $\sigma_8^{6-9}$ 比例变化。在更小的尺度（$l>1000$）上，光谱由低于 $10^{13}M_{\sun}$ 的晕主导，因此对星系晕气体的热历史敏感。 在更大尺度（$l<1000$）上，功率谱对非引力能量注入的敏感性较低，但变得非常嘈杂，功率谱中因地图中的稀有亮源引起的场与场之间的巨大变化，这些亮源在尺度上主导了大尺度结构的相关性。 与弱透镜或投影星系分布的交叉功率谱具有重要意义，且交叉相关系数在广泛的尺度范围内约为0.5。 与Press-Schechter预测的比较在所有统计量上都显示出非常好的一致性，表明非暴乱结构对SZ的贡献没有显著影响。 单点分布函数显示出明显的非高斯偏离，并且在小尺度上可以很好地近似为对数正态分布。 显示英文摘要

摘要： We use moving mesh hydrodynamical simulations to make maps of Sunyaev-Zeldovich effect. We present these maps for several cosmological models and explore their lowest moments. We find that the first moment, the mean Compton $y$ parameter, is typically between $1-2\times 10^{-6}$ for cluster abundance normalized models, the lower value corresponding to the high density models, and scales as $\sigma_8^{3-4}$. Rms fluctuations at 10' scale have an amplitude $ \Delta T/T \sim 1-3 \times 10^{-6}$ in the Rayleigh-Jeans regime. The amplitude of the power spectrum strongly depends on the power spectrum normalization and scales as $\sigma_8^{6-9}$. On smaller scales ($l>1000$) the spectrum is dominated by halos below $10^{13}M_{\sun}$ and so is sensitive to the thermal history of galactic halo gas. On larger scales ($l<1000$) the power spectrum is less sensitive to nongravitational energy injection, but becomes very noisy, with large field to field variations in the power spectrum caused by rare bright sources in the maps, which dominate in the spectrum over the large scale structure correlations. Cross-correlation power spectrum with weak lensing or projected galaxy distribution is significant and the cross-correlation coefficient is around 0.5 over a wide range of scales. Comparison with Press-Schechter predictions gives very good agreement for all the statistics, indicating that there is no significant contribution to SZ from non-virialized structures. The one point distribution function shows clear deviations from gaussianity and can be well-approximated as log-normal on small scales.