Correlation between centre offsets and gas velocity dispersion of galaxy clusters in cosmological simulations

doi:10.1093/mnras/sty1222

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	Correlation between centre offsets and gas velocity dispersion of galaxy clusters in cosmological simulations
	Zhu, WS; Li, MH; Zhao, D; Zhao D(赵东)
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018
卷号	478 期号:4 页码:4974-4985
关键词	methods: numerical galaxies: haloes galaxies: structure dark matter
ISSN号	0035-8711
DOI	10.1093/mnras/sty1222
文献子类	Article
英文摘要	The gas is the dominant component of baryonic matter in most galaxy groups and clusters. The spatial offsets of the gas centre from the halo centre could be an indicator of the dynamical state of cluster. Knowledge of such offsets is important for estimating the uncertainties when using clusters as cosmological probes. In this paper, we study the centre offsets r(off) of the gas and that of all matter within halo systems in Lambda cold dark matter (Lambda CDM) cosmological hydrodynamic simulations. We focus on two kinds of centre offsets: One is the 3D potential minimum-barycentre (PB) offsets between the gravitational potential minimum of the entire halo and the barycentre of the intra-cluster medium (ICM), and the other is the 2D potential minimum-X-ray centroid (PX) offsets between the potential minimum of the halo and the iterative centroid of the projected synthetic X-ray emission of the halo. Haloes at higher redshifts tend to have larger values of rescaled offsets r(off)/r(200) and larger gas velocity dispersion sigma(gas)(nu)/sigma(200). For both types of offsets, we find that the correlation between the rescaled centre offsets r(off)/r(200) and the rescaled 3D gas velocity dispersion sgas sigma(gas)(nu)/sigma(200) can be approximately described by a quadratic function as r(off)/r(200) proportional to (sigma(gas)(nu)/sigma(200) -k(2))(2). ABayesian analysis with the Markov-chain Monte Carlo method is employed to estimate the model parameters. Dependence of the correlation on redshifts and the gas mass fraction is also investigated.
电子版国际标准刊号	1365-2966
WOS关键词	DARK-MATTER ; DYNAMICAL STATE ; MASS ; CONSTRAINTS ; PROFILES ; INSIGHTS ; PHYSICS ; SAMPLE
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000441288300048
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286214]
专题	高能物理研究所_核技术应用研究中心高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Zhu, WS,Li, MH,Zhao, D,et al. Correlation between centre offsets and gas velocity dispersion of galaxy clusters in cosmological simulations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,478(4):4974-4985.
APA	Zhu, WS,Li, MH,Zhao, D,&赵东.(2018).Correlation between centre offsets and gas velocity dispersion of galaxy clusters in cosmological simulations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,478(4),4974-4985.
MLA	Zhu, WS,et al."Correlation between centre offsets and gas velocity dispersion of galaxy clusters in cosmological simulations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 478.4(2018):4974-4985.