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arXiv 1106.3208astro-ph.CO
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一个简单的经验激发的未分辨热Sunyaev-Zeldovich效应的模板

A Simple Empirically Motivated Template for the Unresolved Thermal Sunyaev-Zeldovich Effect

George Efstathiou, Marina Migliaccio

摘要:

我们开发了一个模型的未解决的星系团所产生的热Sunyaev-Zeldovich(tSZ)效应的功率谱。该模型是基于一个“通用”的气体压力分布约束的X射线观测,并包括一个参数来描述偏离自相似的演变。该模型与最近普朗克观测到的红移z<1的X射线团簇的tSZ效应是一致的,并再现了从最近的地面观测推断的tSZ的低振幅。通过调整两个自由参数,我们能够重现的tSZ功率谱从最近的数值模拟的准确性,以及在理论的不确定性。我们的模型提供了一个简单的,经验动机的tSZ模板,可能是有用的新的实验,如普朗克分析。

英文摘要:

We develop a model for the power spectrum of unresolved clusters of galaxies arising from the thermal Sunyaev-Zeldovich (tSZ) effect. The model is based on a'universal' gas pressure profile constrained by X-ray observations and includes a parameter to describe departures from self-similar evolution. The model is consistent with recent Planck observations of the tSZ effect for X-ray clusters with redshifts z<1 and reproduces the low amplitude for the tSZ inferred from recent ground based observations. By adjusting two free parameters, we are able to reproduce the tSZ power spectra from recent numerical simulations to an accuracy that is well within theoretical uncertainties. Our model provides a simple, empirically motivated tSZ template that may be useful for the analysis of new experiments such as Planck.

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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