A BARYONIC EFFECT ON THE MERGER TIMESCALE OF GALAXY CLUSTERS

	A BARYONIC EFFECT ON THE MERGER TIMESCALE OF GALAXY CLUSTERS
	Zhang, Congyao 1; Yu, Qingjuan 1; Lu, Youjun2
刊名	ASTROPHYSICAL JOURNAL
	2016-04-01
卷号	820 期号:2
关键词	galaxies: clusters: general large-scale structure of universe methods: numerical
英文摘要	Accurate estimation of the merger timescales of galaxy clusters is important for understanding the cluster merger process and further understanding the formation and evolution of the large-scale structure of the universe. In this paper, we explore a baryonic effect on the merger timescale of galaxy clusters by using hydrodynamical simulations. We find that the baryons play an important role in accelerating the merger process. The merger timescale decreases upon increasing the gas fraction of galaxy clusters. For example, the merger timescale is shortened by a factor of up to 3 for merging clusters with gas fractions of 0.15, compared with the timescale obtained with 0 gas fractions. The baryonic effect is significant for a wide range of merger parameters and is particularly more significant for nearly head-on mergers and high merging velocities. The baryonic effect on the merger timescale of galaxy clusters is expected to have an impact on the structure formation in the universe, such as the cluster mass function and massive substructures in galaxy clusters, and a bias of "no-gas" may exist in the results obtained from the dark matter-only cosmological simulations.
收录类别	SCI
语种	英语
WOS记录号	WOS:000373741300004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5361]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Congyao,Yu, Qingjuan,Lu, Youjun. A BARYONIC EFFECT ON THE MERGER TIMESCALE OF GALAXY CLUSTERS[J]. ASTROPHYSICAL JOURNAL,2016,820(2).
APA	Zhang, Congyao,Yu, Qingjuan,&Lu, Youjun.(2016).A BARYONIC EFFECT ON THE MERGER TIMESCALE OF GALAXY CLUSTERS.ASTROPHYSICAL JOURNAL,820(2).
MLA	Zhang, Congyao,et al."A BARYONIC EFFECT ON THE MERGER TIMESCALE OF GALAXY CLUSTERS".ASTROPHYSICAL JOURNAL 820.2(2016).