The MUSIC of Galaxy Clusters II: X-ray global properties and scaling relations
The MUSIC of Galaxy Clusters II: X-ray global properties and scaling relations
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星系团 II 的音乐：X 射线全局属性和标度关系
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Gottlober
中科院分区：
文献类型：
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作者：
V. Biffi;F. Sembolini;M. Petris;R. Valdarnini;G. Yepes;S. Gottlober
我们展示了从 Marenostrum MUltidark 星系团模拟 (MUSIC) 数据集中提取的大量星团样本的 X 射线特性和尺度关系。我们重点关注红移 z � 0.11 处 179 个星团的子样本，其中 3.2 × 10 14 h −1 M⊙ < Mvir < 2 × 10 15 h −1 M⊙，质量完整。我们使用 X 射线光子模拟器 PHOX 来获得合成的钱德拉观测结果，并导出簇内介质 (ICM) 的类似可观测的全局特性，如 X 射线温度 (TX) 和光度 (LX)。尽管很好地追踪了星团总质量，但发现 TX 稍微低估了真实的质量加权温度。我们还研究了 TX 对与团簇内在属性的标度关系的影响：总（M500 和气体 Mg,500 质量；Sunyaev-Zel'dovich (SZ) 热效应的积分康普顿参数 (YSZ)；YX = Mg,500 TX。我们确认 YX 是一个非常好的质量代理，M500 YX 和 YSZ YX 上的散点低于 5%。 X 射线、内在和 SZ 属性表明，模拟的 MUSIC 簇与自相似预测相当相似，特别是对于涉及 TX 的相关性。观察方法还可以与真实簇进行更直接的比较，我们发现偏差主要是由于 ICM 的物理描述造成的，影响了 TX，特别是 LX。
We present the X-ray properties and scaling relations of a large sample of clusters extracted from the Marenostrum MUltidark SImulations of galaxy Clusters (MUSIC) dataset. We focus on a sub-sample of 179 clusters at redshift z � 0.11, with 3.2 × 10 14 h −1 M⊙ < Mvir < 2 × 10 15 h −1 M⊙, complete in mass. We employed the X-ray photon simulator PHOX to obtain synthetic Chandra observations and derive observable-like global properties of the intracluster medium (ICM), as X-ray temperature (TX) and luminosity (LX). TX is found to slightly under-estimate the true mass-weighted temperature, although tracing fairly well the cluster total mass. We also study the effects of TX on scaling relations with cluster intrinsic properties: total (M500 and gas Mg,500 mass; integrated Compton parameter (YSZ) of the Sunyaev-Zel’dovich (SZ) thermal effect; YX = Mg,500 TX. We confirm that YX is a very good mass proxy, with a scatter on M500 YX and YSZ YX lower than 5%. The study of scaling relations among X-ray, intrinsic and SZ properties indicates that simulated MUSIC clusters reasonably resemble the self-similar prediction, especially for correlations involving TX. The observational approach also allows for a more direct comparison with real clusters, from which we find deviations mainly due to the physical description of the ICM, affecting TX and, particularly, LX.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.