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arXiv 0704.2535astro-ph
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Sunyaev-Zel'dovich廓线和标度关系:模拟效应和观测偏差

Sunyaev-Zel'dovich profiles and scaling relations: modelling effects and observational biases

A. Bonaldi, G. Tormen, K. Dolag, L. Moscardini

摘要:

利用高分辨率流体动力学再模拟方法研究了星系团的热Sunyaev-Zel'dovich(SZ)效应的性质。我们比较了使用不同的物理模型的簇内介质(ICM)的结果,并显示他们如何修改的SZ发射的集群配置文件和标度关系。我们还制作了逼真的模拟观测,以验证水动力模拟的结果是否可以证实。我们发现,SZ配置文件依赖于模拟的物理过程,而他们表现出强烈的依赖于集群质量。中心和总SZ发射强烈相关的集群X射线光度和温度。这些标度关系的对数斜率与自相似预测的差异小于0.2;对于包括辐射冷却的模拟,关系的归一化较低。观测测试表明,SZ集群配置文件不太可能能够探测ICM物理。总的SZ减少似乎是一个可观察到的更强大的比中央强度,我们建议使用前者调查的标度关系。

英文摘要:

We use high-resolution hydrodynamic re-simulations to investigate the properties of the thermal Sunyaev-Zel'dovich (SZ) effect from galaxy clusters. We compare results obtained using different physical models for the intracluster medium (ICM), and show how they modify the SZ emission in terms of cluster profiles and scaling relations. We also produce realistic mock observations to verify whether the results from hydrodynamic simulations can be confirmed. We find that SZ profiles depend marginally on the modelled physical processes, while they exhibit a strong dependence on cluster mass. The central and total SZ emission strongly correlate with the cluster X-ray luminosity and temperature. The logarithmic slopes of these scaling relations differ from the self-similar predictions by less than 0.2; the normalization of the relations is lower for simulations including radiative cooling. The observational test suggests that SZ cluster profiles are unlikely to be able to probe the ICM physics. The total SZ decrement appears to be an observable much more robust than the central intensity, and we suggest using the former to investigate scaling relations.

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。

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