The scatter and evolution of the global hot gas properties of simulated galaxy cluster populations
The scatter and evolution of the global hot gas properties of simulated galaxy cluster populations
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模拟星系团种群全球热气特性的散射与演化
DOI：
10.1093/mnras/stw3361
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发表时间：
2016
影响因子：
4.8
通讯作者：
T. Ponman
中科院分区：
文献类型：
--
作者：
A. Brun;I. McCarthy;J. Schaye;T. Ponman
我们使用宇宙流体动力学模拟的 cosmo-OWLS 套件来研究大型模拟星系群和星系团的全球热气体特性的散射和演化。我们的目的是比较不同物理模型的预测，并探索观察分析中普遍采用的假设（例如自相似进化）被违反的程度。我们研究（真实）晕质量与 X 射线温度、X 射线光度、气体质量、Sunyaev-Zel'dovich (SZ) 通量、SZ 通量的 X 射线模拟 ($Y_X$) 和静水质量之间的关系。对于包括活动星系核反馈的最现实模型，各种质量可观测关系的斜率与自相似关系的斜率有很大偏差，特别是在后期和低质量星团中。质量-温度关系的幅度显示出相对于所有模型的自相似预测（即慢于预测）的负演化，这是由较高红移下非热压力支持的增加所驱动的。 AGN 模型预测低晕质量下气体质量分数的强烈正演化。 SZ 通量和 $Y_X$ 在低质量下显示出自相似性的正演化，但在高质量下显示出负演化。有关关系的分散性可以很好地近似为对数正态分布，其宽度在一定程度上取决于光晕质量。随着红移的增加，散射显着减少。静水质量-晕质量关系是个例外，其中散射随着红移而增加。最后，我们讨论各种基于热气的质量代理的相对优点。
We use the cosmo-OWLS suite of cosmological hydrodynamical simulations to investigate the scatter and evolution of the global hot gas properties of large simulated populations of galaxy groups and clusters. Our aim is to compare the predictions of different physical models and to explore the extent to which commonly-adopted assumptions in observational analyses (e.g. self-similar evolution) are violated. We examine the relations between (true) halo mass and the X-ray temperature, X-ray luminosity, gas mass, Sunyaev-Zel'dovich (SZ) flux, the X-ray analogue of the SZ flux ($Y_X$) and the hydrostatic mass. For the most realistic models, which include AGN feedback, the slopes of the various mass-observable relations deviate substantially from the self-similar ones, particularly at late times and for low-mass clusters. The amplitude of the mass-temperature relation shows negative evolution with respect to the self-similar prediction (i.e. slower than the prediction) for all models, driven by an increase in non-thermal pressure support at higher redshifts. The AGN models predict strong positive evolution of the gas mass fractions at low halo masses. The SZ flux and $Y_X$ show positive evolution with respect to self-similarity at low mass but negative evolution at high mass. The scatter about the relations is well approximated by log-normal distributions, with widths that depend mildly on halo mass. The scatter decreases significantly with increasing redshift. The exception is the hydrostatic mass-halo mass relation, for which the scatter increases with redshift. Finally, we discuss the relative merits of various hot gas-based mass proxies.
DOI：
10.1111/j.1365-2966.2009.15034.x
发表时间：
2008-08
影响因子：
4.8
作者：
K. Dolag;S. Borgani;S. Borgani;S. Borgani;G. Murante;V. Springel
通讯作者：
K. Dolag;S. Borgani;S. Borgani;S. Borgani;G. Murante;V. Springel
MACSIS 模拟中大质量星系团的红移演化
影响因子：
4.8
作者：
Barnes D
通讯作者：
Barnes D