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arXiv 2112.07656astro-ph.CO
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评估来自热Sunyaev-Zel '} dovich信号的噪声对CMB星系团巡天和星系团宇宙学的重要性

Assessing the Importance of Noise from Thermal Sunyaev-Zel{'}dovich Signals for CMB Cluster Surveys and Cluster Cosmology

Srinivasan Raghunathan

摘要:

我们探讨了噪声的意义,从热Sunyaev-Zel '} dovich(tSZ)信号的集群检测使用宇宙微波背景(CMB)的调查。噪声既来自邻近物体,也来自检测限以下的晕。广泛的调查被认为是:SPT-SZ,SPTpol和SPT-3G从南极望远镜; SO基线和SO目标配置西蒙斯天文台; CMB-S4的广域(S4-宽)和深(S4-超深)调查;和未来的CMB-HD实验。我们发现,来自tSZ信号的噪声对CMB-HD具有显著影响,并且在一定程度上对S4-Ultra deep具有显著影响。对于其他实验,由于tSZ图中的噪声由残余前景或实验噪声主导,因此该影响可忽略不计。在tSZ信号的噪声很重要的限制下,我们发现删除检测到的集群并重新运行集群查找器可以让我们找到一组新的质量较小且距离较远的集群。由于检测到的簇是tSZ功率的主要来源,因此移除它们通过以下方式降低$\ell=3000$处的功率:用于CMB-HD的$\times5$;用于S4-Ultra deep的$\times3.1$;用于S4-Wide和SPT-3G的$\times2.4$;用于SO-Goal和SPTpol的$\times1.5$;用于SO-基线的$\times1.35$;以及用于SPT-SZ的$\times1.08$。我们预测的预期数量的集群,并得出参数约束相结合的集群计数与主CMB和tSZ功率谱发现,未来的调查可以减少对暗能量状态方程参数的误差,以子百分比的水平,也可以使$\ge3σ$检测中微子质量的总和。模拟产品和结果可从https://github.com/sriniraghunathan/tSZ_cluster_forecasts下载。

英文摘要:

We explore the significance of noise from thermal Sunyaev-Zel{'}dovich (tSZ) signals for cluster detection using cosmic microwave background (CMB) surveys. The noise arises both from neighboring objects and also from haloes below the detection limit. A wide range of surveys are considered: SPT-SZ, SPTpol, and SPT-3G from the South Pole Telescope; SO-Baseline and SO-Goal configurations for Simons Observatory; CMB-S4's wide area (S4-Wide) and deep (S4-Ultra deep) surveys; and the futuristic CMB-HD experiment. We find that the noise from tSZ signals has a significant impact on CMB-HD and to some extent on S4-Ultra deep. For other experiments, the effect is negligible as the noise in the tSZ map is dominated by residual foregrounds or experimental noise. In the limit when the noise from tSZ signals is important, we find that removing the detected clusters and rerunning the cluster finder allows us to find a new set of less massive and distant clusters. Since the detected clusters are the dominant source of the tSZ power, removing them reduces the power at $\ell=3000$ by: $\times5$ for CMB-HD; $\times3.1$ of S4-Ultra deep; $\times2.4$ for S4-Wide and SPT-3G; $\times1.5$ for SO-Goal and SPTpol; $\times1.35$ for SO-Baseline; and $\times1.08$ for SPT-SZ. We forecast the expected number of clusters and also derive parameter constraints by combining cluster counts with primary CMB and tSZ power spectra finding that the future surveys can reduce the error on the dark energy equation of state parameter to sub-percent levels and can also enable $\ge3σ$ detection of the sum of neutrino masses. The simulation products and results can be downloaded from https://github.com/sriniraghunathan/tSZ_cluster_forecasts.

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