VORTICAL MOTIONS OF BARYONIC GAS IN THE COSMIC WEB: GROWTH HISTORY AND SCALING RELATION

	VORTICAL MOTIONS OF BARYONIC GAS IN THE COSMIC WEB: GROWTH HISTORY AND SCALING RELATION
	Zhu, Weishan 1,2; Feng, Long-long1,3
刊名	ASTROPHYSICAL JOURNAL
	2015-10-01
卷号	811 期号:2
关键词	cosmology: theory intergalactic medium large-scale structure of universe methods: numerical
英文摘要	The vortical motions of the baryonic gas residing in large-scale structures are investigated by cosmological hydrodynamic simulations. Proceeding in the formation of the cosmic web, the vortical motions of baryonic matter are pumped up by baroclinity in two stages, i.e., the formation of sheets and filaments. The mean curl velocities are about <1, 1-10, 10-150, and 5-50 km s(-1) in voids, sheets, filaments, and knots at z = 0, respectively. The scaling of the vortical velocity of gas can be well described by the She-Leveque hierarchical turbulence model in the range of l < 0.65(1.50) h(-1) Mpc in a simulation with a box of size 25(100) h(-1) Mpc. The fractal Hausdorff dimension of vortical motions, d, revealed by velocity structure functions, is similar to 2.1-2.3(similar to 1.8-2.1). It is slightly larger than the fractal dimension of mass distribution in filaments, D-f similar to 1.9-2.2, and smaller than the fractal dimension of sheets, D-s similar to 2.4-2.7. The vortical kinetic energy of baryonic gas is mainly transported by filaments. Both scalings of mass distribution and vortical velocity increments show distinctive transitions at the turning scale of similar to 0.65(1.50) h(-1) Mpc, which may be closely related to the characteristic radius of density filaments.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	FULLY-DEVELOPED TURBULENCE ; LOG-POISSON STATISTICS ; INTERGALACTIC MEDIUM ; INTERMITTENCY ; EVOLUTION ; UNIVERSE
收录类别	SCI
语种	英语
WOS记录号	WOS:000363513800022
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/16030]
专题	紫金山天文台_南极天文中心
作者单位	1.Sun Yat Sen Univ, Inst Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China 2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210092, Jiangsu, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Weishan,Feng, Long-long. VORTICAL MOTIONS OF BARYONIC GAS IN THE COSMIC WEB: GROWTH HISTORY AND SCALING RELATION[J]. ASTROPHYSICAL JOURNAL,2015,811(2).
APA	Zhu, Weishan,&Feng, Long-long.(2015).VORTICAL MOTIONS OF BARYONIC GAS IN THE COSMIC WEB: GROWTH HISTORY AND SCALING RELATION.ASTROPHYSICAL JOURNAL,811(2).
MLA	Zhu, Weishan,et al."VORTICAL MOTIONS OF BARYONIC GAS IN THE COSMIC WEB: GROWTH HISTORY AND SCALING RELATION".ASTROPHYSICAL JOURNAL 811.2(2015).