标题： 重子化 II：利用 X 射线和动力学苏尼亚耶夫-泽尔多维奇观测约束反馈 显示英文标题

标题： Baryonification II: Constraining feedback with X-ray and kinematic Sunyaev-Zel'dovich observations

摘要： 重子反馈改变了小尺度和中等尺度的物质分布，这对精确宇宙学构成了挑战。 新的、逐组分的重子化（BFC）方法提供了一个自洽的框架，用于对不同观测值建模反馈效应。 在本文中，我们使用这个框架来拟合来自阿塔卡马宇宙学望远镜（ACT）的动力学苏尼亚耶夫-泽尔多维奇（kSZ）观测数据，以及来自eROSITA的晕X射线气体分数，从而在宇宙学背景下研究重子反馈。 我们首先表明，ACT的kSZ数据与eROSITA的气体分数是一致的，两者都表明一个比大多数流体动力学模拟中假设的更强的反馈模型。 这一发现与较早的、在eROSITA之前的气体分数测量结果形成对比，这些结果指向较弱的反馈，与kSZ结果存在矛盾。 我们怀疑这些差异是由于eROSITA之前的样本存在选择偏差，或者两种数据集在晕质量估计上的差异所致。 进一步地，我们使用BFC模型预测物质功率谱的重子抑制。 基于我们对ACT和eROSITA数据的联合拟合，我们发现，在高于$k=0.3-0.6 \,h\,\mathrm{Mpc}^{-1}$的模式下，功率谱的抑制超过了百分之一，增长到在$k=1\,h\,\mathrm{Mpc}^{-1}$时为2-8%，在$k=5\,h\,\mathrm{Mpc}^{-1}$时为20-25%，这与强反馈的流体动力学模拟一致。 最后，我们将最佳拟合模型与X-COP样本中大质量星系团的观测气体密度和压力剖面进行比较，发现有很好的一致性。 这些结果表明，BFC在质量尺度和长度尺度以及不同的宇宙学观测值上提供了反馈的自洽图景，因此使其在多波长研究中联合约束宇宙学和重子效应方面具有前景。 显示英文摘要

摘要： Baryonic feedback alters the matter distribution on small and intermediate scales, posing a challenge for precision cosmology. The new, component-wise baryonification (BFC) approach provides a self-consistent framework to model feedback effects for different observables. In this paper we use this framework to fit kinematic Sunyaev-Zel'dovich (kSZ) observations from the Atacama Cosmology Telescope (ACT) alongside halo X-ray gas fractions from eROSITA, investigating baryonic feedback in a cosmological context. We first show that the kSZ data from ACT is consistent with the gas fractions from eROSITA, both suggesting a feedback model that is stronger than what is assumed in most hydrodynamical simulations. This finding is in contrast to older, pre-eROSITA gas fraction measurements that point towards weaker feedback in tension with the kSZ results. We suspect these discrepancies to be due to selection bias in the pre-eROSITA sample, or differences in halo mass estimation between the two data sets. In a further step, we use the BFC model to predict the baryonic suppression of the matter power spectrum. Based on our combined fit to data from ACT and eROSITA, we find a power spectrum suppression that exceeds the percent-level at modes above $k=0.3-0.6 \,h\,\mathrm{Mpc}^{-1}$, growing to 2-8 percent at $k=1\,h\,\mathrm{Mpc}^{-1}$, and to 20-25 percent at $k=5\,h\,\mathrm{Mpc}^{-1}$, consistent with strong-feedback hydrodynamical simulations. Finally, we compare our best-fitting model to the observed gas density and pressure profiles of massive galaxy clusters from the X-COP sample, finding excellent agreement. These results show that BFC provides a self-consistent picture of feedback across mass- and length scales as well as different cosmological observables, thus making it promising for applications to multiwavelength studies to jointly constrain cosmology and baryonic effects.