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VORTICAL MOTIONS OF BARYONIC GAS IN THE COSMIC WEB: GROWTH HISTORY AND SCALING RELATION
Zhu, Weishan1,2; Feng, Long-long1,3
2015-10-01
Source PublicationASTROPHYSICAL JOURNAL
Volume811Issue:2
AbstractThe 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.
KeywordCosmology: Theory Intergalactic Medium Large-scale Structure Of Universe Methods: Numerical
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/811/2/94
WOS KeywordFULLY-DEVELOPED TURBULENCE ; LOG-POISSON STATISTICS ; INTERGALACTIC MEDIUM ; INTERMITTENCY ; EVOLUTION ; UNIVERSE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000363513800022
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16030
Collection南极天文中心
Affiliation1.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
Recommended Citation
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).
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