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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2301.02186 (astro-ph)
[Submitted on 5 Jan 2023 ]

Title: Inferring the impact of feedback on the matter distribution using the Sunyaev Zel'dovich effect: Insights from CAMELS simulations and ACT+DES data

Title: 利用太阳亚夫-泽尔多维奇效应推断反馈对物质分布的影响:来自CAMELS模拟和ACT+DES数据的见解

Authors:Shivam Pandey, Kai Lehman, Eric J. Baxter, Yueying Ni, Daniel Anglés-Alcázar, Shy Genel, Francisco Villaescusa-Navarro, Ana Maria Delgado, Tiziana di Matteo
Abstract: Feedback from active galactic nuclei and stellar processes changes the matter distribution on small scales, leading to significant systematic uncertainty in weak lensing constraints on cosmology. We investigate how the observable properties of group-scale halos can constrain feedback's impact on the matter distribution using Cosmology and Astrophysics with MachinE Learning Simulations (CAMELS). Extending the results of previous work to smaller halo masses and higher wavenumber, $k$, we find that the baryon fraction in halos contains significant information about the impact of feedback on the matter power spectrum. We explore how the thermal Sunyaev Zel'dovich (tSZ) signal from group-scale halos contains similar information. Using recent Dark Energy Survey (DES) weak lensing and Atacama Cosmology Telescope (ACT) tSZ cross-correlation measurements and models trained on CAMELS, we obtain $10\%$ constraints on feedback effects on the power spectrum at $k \sim 5\, h/{\rm Mpc}$. We show that with future surveys, it will be possible to constrain baryonic effects on the power spectrum to $\mathcal{O}(<1\%)$ at $k = 1\, h/{\rm Mpc}$ and $\mathcal{O}(3\%)$ at $k = 5\, h/{\rm Mpc}$ using the methods that we introduce here. Finally, we investigate the impact of feedback on the matter bispectrum, finding that tSZ observables are highly informative in this case.
Abstract: 活动星系核和恒星过程的反馈改变了小尺度上的物质分布,导致弱引力透镜对宇宙学的约束存在显著的系统不确定性。 我们研究了星系团尺度晕的可观测特性如何通过宇宙学与天体物理学机器学习模拟(CAMELS)来限制反馈对物质分布的影响。 将之前工作的结果扩展到更小的晕质量以及更高的波数,$k$,我们发现晕中的重子比例包含了关于反馈对物质功率谱影响的重要信息。 我们探讨了来自星系团尺度晕的热太阳亚夫-泽尔多维奇(tSZ)信号是否包含类似的信息。 利用最近的暗能量调查(DES)弱引力透镜和阿塔卡马宇宙学望远镜(ACT)tSZ交叉相关测量数据以及基于CAMELS训练的模型,我们得到了$10\%$在$k \sim 5\, h/{\rm Mpc}$处对功率谱上反馈效应的约束。 我们表明,通过未来的调查,使用我们在此介绍的方法,可以在$\mathcal{O}(<1\%)$处和$k = 1\, h/{\rm Mpc}$处对功率谱上的重子效应进行约束,以及在$\mathcal{O}(3\%)$处和$k = 5\, h/{\rm Mpc}$处进行约束。 最后,我们研究了反馈对物质双谱的影响,发现在此情况下tSZ观测量是非常有信息量的。
Comments: 18 pages, 15 figures. Comments are welcome
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; Astrophysics of Galaxies (astro-ph.GA); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2301.02186 [astro-ph.CO]
  (or arXiv:2301.02186v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2301.02186
arXiv-issued DOI via DataCite
Related DOI: https://doi.org/10.1093/mnras/stad2268
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Submission history

From: Shivam Pandey [view email]
[v1] Thu, 5 Jan 2023 17:51:24 UTC (3,679 KB)
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