Influence of baryons on the spatial distribution of matter: higher order correlation functions

	Influence of baryons on the spatial distribution of matter: higher order correlation functions
	Zhu, Xiao-Jun 1; Pan, Jun 1,2
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2012-12-01
卷号	12 期号:12 页码:1603-1612
关键词	cosmology: dark matter large-scale structure of universe methods: statistical
英文摘要	Physical processes involving baryons could leave a non-negligible imprint on the distribution of cosmic matter. A series of simulated data sets at high resolution with identical initial conditions are employed for count-in-cell analysis, including one N-body pure dark matter run, one with only adiabatic gas and one with dissipative processes. Variances and higher order cumulants S-n of dark matter and gas are estimated. It is found that physical processes with baryons mainly affect distributions of dark matter at scales less than 1 h(-1) Mpc. In comparison with the pure dark matter run, adiabatic processes alone strengthen the variance of dark matter by similar to 10% at a scale of 0.1 h(-1) Mpc, while the S-n parameters of dark matter only mildly deviate by a few percent. The dissipative gas run does not differ much from the adiabatic run in terms of variance for dark matter, but renders significantly different S-n parameters describing the dark matter, bringing about a more than 10% enhancement to S-3 at 0.1 h(-1) Mpc and z = 0 and being even larger at a higher redshift. Distribution patterns of gas in two hydrodynamical simulations are quite different. Variance of gas at z = 0 decreases by similar to 30% in the adiabatic simulation but by similar to 60% in the non-adiabatic simulation at 0.1 h(-1) Mpc. The attenuation is weaker at larger scales but is still obvious at similar to 10 h(-1) Mpc. S-n parameters of gas are biased upward at scales < similar to 4 h(-1) Mpc, and dissipative processes show an similar to 84% promotion at z = 0 to S-3 at 0.1 h(-1) Mpc in contrast with the similar to 7% change in the adiabatic run. The segregation in clustering between gas and dark matter could have dramatic implications on modeling distributions of galaxies and relevant cosmological applications demanding fine details of matter distribution in a strongly nonlinear regime.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	COSMOLOGICAL PERTURBATION-THEORY ; ZELDOVICH POWER SPECTRUM ; LARGE-SCALE STRUCTURE ; HALO MASS FUNCTION ; INITIAL CONDITIONS ; GALAXY FORMATION ; PHYSICS ; SIMULATIONS ; UNIVERSE ; CODE
收录类别	SCI
语种	英语
WOS记录号	WOS:000313011000002
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8112]
专题	紫金山天文台_南极天文中心
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Xiao-Jun,Pan, Jun. Influence of baryons on the spatial distribution of matter: higher order correlation functions[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(12):1603-1612.
APA	Zhu, Xiao-Jun,&Pan, Jun.(2012).Influence of baryons on the spatial distribution of matter: higher order correlation functions.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(12),1603-1612.
MLA	Zhu, Xiao-Jun,et al."Influence of baryons on the spatial distribution of matter: higher order correlation functions".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.12(2012):1603-1612.