热气体的超团簇：Websky模拟中的宇宙学敏感性
The superclustering of hot gas: cosmological sensitivity in the Websky simulations
AI总结：
本研究利用Websky模拟，通过定向约束堆叠的多极矩统计量，研究热Sunyaev-Zel'dovich效应在超团簇区域对宇宙学参数和气体物理的敏感性。
摘要：
星系巡天与宇宙微波背景次级效应（如热Sunyaev-Zel'dovich (tSZ)效应）的组合正越来越多地被用于联合约束宇宙学以及晕内和晕外气体的天体物理性质。标准互相关测量的是微波图与星系目录之间的无方向相关性。然而，通过包含环境约束并测量沿结构轴（如纤维或超团簇）的定向相关的汇总统计量，可以捕捉更多关于宇宙网结构的信息。本研究研究了约束定向堆叠的多极矩（一种定向且环境依赖的统计量）对宇宙学和天体物理参数变化的敏感性。我们使用Websky算法运行了九个不同的2.4 Gpc每边的模拟，在平坦$Λ$CDM中改变物质密度，并为每个模拟生成模拟tSZ图。我们还对基准宇宙学应用了六种不同的气体模型，模拟AGN反馈变化。我们在每个模拟中分析了超团簇区域中tSZ信号的定向堆叠，重点关注来自大质量（$M>5 imes10^{13}~M_\odot$）晕的约20横向Mpc内的信号。宇宙学变化对各向异性和各向同性测量的影响相似，而晕粘贴气体变化主要影响各向同性信号。我们的结果表明，将定向信息纳入SZ-星系互相关中是有价值的，可以增加宇宙学敏感性并帮助打破与气体物理的简并。
英文摘要：
Combinations of galaxy surveys and cosmic microwave background secondaries, such as the thermal Sunyaev-Zel'dovich (tSZ) effect, are increasingly being used to jointly constrain cosmology and astrophysical properties of the gas within and beyond halos. Standard cross-correlations measure a directionless correlation between the microwave maps and galaxy catalogs. However, more information about the cosmic web structure can be captured by summary statistics which include environmental constraints and measure oriented correlations along axes of structure, such as filaments or superclusters. This work studies the sensitivity of multipole moments of constrained oriented stacks, a directional and environmentally-dependent statistic, to variations in cosmological and astrophysical parameters. We run nine different 2.4 Gpc-per-side simulations with the Websky algorithm, varying the matter density within flat $Λ$CDM, and create mock tSZ maps with each. We also apply six different gas prescriptions, imitating AGN feedback variations, to the fiducial cosmology. We analyze oriented stacks of the tSZ signal in supercluster regions in each simulation, focusing on signal out to $\sim20$ transverse Mpc from massive ($M>5\times10^{13}~M_\odot$) halos. The cosmology variations affect anisotropic and isotropic measurements similarly, while the halo-pasted gas variations mostly affect the isotropic signal. Our results suggest it is worthwhile to incorporate directional information into SZ-galaxy cross-correlations to increase cosmological sensitivity and help break degeneracies with gas physics.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
