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arXiv 0708.0815astro-ph
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高红移星系团的Sunyaev-Zel'dovich效应和Chandra X射线测量的标度关系

Scaling Relations from Sunyaev-Zel'dovich Effect and Chandra X-ray measurements of high-redshift galaxy clusters

Massimiliano Bonamente, Marshall Joy, Samuel LaRoque, John Carlstrom, Daisuke Nagai, Dan Marrone

摘要:

本文给出了38个大质量星系团在红移0.14<z0.89时的Sunyaev-Zel'dovich效应(SZE)标度关系,这些星系团是由Cchandra X射线天文台和BIMA和OVRO干涉阵列的厘米波SZE成像系统观测到的。从X射线数据中排除中心100 kpc的等温β模型被用来模拟团内介质和测量全球集群属性。对于每个团簇,我们测量了X射线光谱温度,SZE气体质量,总质量和积分Compton-y参数在r_2500。我们的测量结果与基于团簇形成和演化的简单自相似模型的预期一致。我们比较了来自我们的SZE观测与没有钱德拉空间和光谱信息的集群属性,发现它们是在良好的协议。我们比较我们的结果与宇宙学数值模拟,发现模拟,包括辐射冷却,恒星形成和反馈匹配以及我们的SZE标度关系的斜率和归一化。

英文摘要:

We present Sunyaev-Zel'dovich Effect (SZE) scaling relations for 38 massive galaxy clusters at redshifts 0.14<z0.89, observed with both the Cchandra X-ray Observatory and the centimeter-wave SZE imaging system at the BIMA and OVRO interferometric arrays. An isothermal beta-model with central 100 kpc excluded from the X-ray data is used to model the intracluster medium and to measure global cluster properties. For each cluster, we measure the X-ray spectroscopic temperature, SZE gas mass, total mass and integrated Compton-y parameters within r_2500. Our measurements are in agreement with the expectations based on a simple self-similar model of cluster formation and evolution. We compare the cluster properties derived from our SZE observations with and without Chandra spatial and spectral information and find them to be in good agreement. We compare our results with cosmological numerical simulations, and find that simulations that include radiative cooling, star formation and feedback match well both the slope and normalization of our SZE scaling relations.

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