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The velocity field of baryonic gas in the universe
Kim, B; He, P; Pando, J; Feng, LL; Fang, LZ
2005-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume625Issue:2Pages:599-612
AbstractThe dynamic evolution of the baryonic intergalactic medium (IGM) caused by the underlying dark matter gravity is governed by the Navier-Stokes equations in which many cooling and heating processes are involved. However, it has long been recognized that the growth mode dynamics of cosmic matter clustering can be sketched by a random force driven Burgers equation if cooling and heating are ignored. Just how well the dynamics of the IGM can be described as a Burgers fluid has not been fully investigated, probably because cooling and heating are essential for a detailed understanding of the IGM. Using IGM samples produced by a cosmological hydrodynamic simulation in which heating and cooling processes are properly accounted for, we show that the IGM velocity field in the nonlinear regime shows the features of a Burgers fluid, that is, when the Reynolds number is high, the velocity field consists of an ensemble of shocks. Consequently, (1) the IGM velocity v is generally smaller than that of dark matter; (2) for the smoothed field, the IGM velocity shows tight correlation with darkmatter given by nu similar or equal to s nu(dm), with s < 1, such that the lower the redshift, the smaller the s; (3) the velocity probability density functions (pdf's) are asymmetric between acceleration and deceleration events; (4) the pdf of velocity difference Delta nu = nu(x + r) - nu(x) satisfies the scaling relation for a Burgers fluid, i.e., P(Delta nu) = (1/r(y))F(Delta nu/r(y)). We find the scaling function and parameters for the IGM that are applicable to the entire scale range of the samples ( 0.26-8 h(-1) Mpc). These properties show that the similarity mapping between the IGM and darkmatter is violated on scales much larger than the Jeans length of the IGM.
KeywordCosmology : Theory Intergalactic Medium Large-scale Structure Of Universe
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordESSENTIALLY NONOSCILLATORY SCHEMES ; LY-ALPHA ABSORPTION ; COLD DARK-MATTER ; BURGERS TURBULENCE ; TRANSMITTED FLUX ; INTERGALACTIC MEDIUM ; GALAXY CLUSTERS ; POWER SPECTRUM ; LARGE SCALES ; MODEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000229436900003
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4092
Collection南极天文中心
Affiliation1.De Paul Univ, Dept Phys, Chicago, IL 60614 USA
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Kim, B,He, P,Pando, J,et al. The velocity field of baryonic gas in the universe[J]. ASTROPHYSICAL JOURNAL,2005,625(2):599-612.
APA Kim, B,He, P,Pando, J,Feng, LL,&Fang, LZ.(2005).The velocity field of baryonic gas in the universe.ASTROPHYSICAL JOURNAL,625(2),599-612.
MLA Kim, B,et al."The velocity field of baryonic gas in the universe".ASTROPHYSICAL JOURNAL 625.2(2005):599-612.
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