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The segregation of baryons and dark matter during halo assembly
Liao, Shihong1; Gao, Liang1,2; Frenk, Carlos S.2; Guo, Qi1; Wang, Jie1
2017-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume470Issue:2Pages:2262-2269
AbstractThe standard galaxy formation theory assumes that baryons and dark matter are initially well mixed before becoming segregated due to radiative cooling. We use non-radiative hydrodynamical simulations to explicitly examine this assumption and find that baryons and dark matter can also be segregated due to different characteristics of gas and dark matter during the buildup of the halo. As a result, baryons in many haloes do not originate from the same Lagrangian region as the dark matter. When using the fraction of corresponding dark matter and gas particles in the initial conditions ( the 'paired fraction') as a proxy of the dark matter and gas segregation strength of a halo, on average about 25 per cent of the baryonic and dark matter of the final halo are segregated in the initial conditions. This is at odds with the assumption of the standard galaxy formation model. A consequence of this effect is that the baryons and dark matter of the same halo initially experience different tidal torques and thus their angular momentum vectors are often misaligned. The degree of the misalignment is largely preserved during later halo assembly and can be understood with the tidal torque theory. The result challenges the precision of some semi-analytical approaches that utilize dark matter halo merger trees to infer properties of gas associated with dark matter haloes.
SubtypeArticle
KeywordMethods: Numerical Galaxies: Haloes Galaxies: Structure
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNSFC grant(11133003 ; NSFC grant(11133003 ; Newton Advanced Fellowship ; Newton Advanced Fellowship ; ERC Advanced Grant COSMIWAY ; ERC Advanced Grant COSMIWAY ; 'Recruitment Program of Global Youth Experts' of China ; 'Recruitment Program of Global Youth Experts' of China ; NAOC grant(Y434011V01) ; NAOC grant(Y434011V01) ; 973 programme grant(2015CB857005) ; 973 programme grant(2015CB857005) ; 11425312 ; 11425312 ; 11573033 ; 11573033 ; 11622325 ; 11622325 ; 11373029 ; 11373029 ; 11390372) ; 11390372) ; NSFC grant(11133003 ; NSFC grant(11133003 ; Newton Advanced Fellowship ; Newton Advanced Fellowship ; ERC Advanced Grant COSMIWAY ; ERC Advanced Grant COSMIWAY ; 'Recruitment Program of Global Youth Experts' of China ; 'Recruitment Program of Global Youth Experts' of China ; NAOC grant(Y434011V01) ; NAOC grant(Y434011V01) ; 973 programme grant(2015CB857005) ; 973 programme grant(2015CB857005) ; 11425312 ; 11425312 ; 11573033 ; 11573033 ; 11622325 ; 11622325 ; 11373029 ; 11373029 ; 11390372) ; 11390372)
DOI10.1093/mnras/stx1391
WOS KeywordANGULAR-MOMENTUM DISTRIBUTION ; GALAXY FORMATION ; GALACTIC HALOS ; DISK GALAXIES ; GAS ; SIMULATION ; ORIGIN ; PROTOGALAXIES ; COSMOLOGY ; UNIVERSE
Indexed BySCI
Language英语
Funding OrganizationNSFC grant(11133003 ; NSFC grant(11133003 ; Newton Advanced Fellowship ; Newton Advanced Fellowship ; ERC Advanced Grant COSMIWAY ; ERC Advanced Grant COSMIWAY ; 'Recruitment Program of Global Youth Experts' of China ; 'Recruitment Program of Global Youth Experts' of China ; NAOC grant(Y434011V01) ; NAOC grant(Y434011V01) ; 973 programme grant(2015CB857005) ; 973 programme grant(2015CB857005) ; 11425312 ; 11425312 ; 11573033 ; 11573033 ; 11622325 ; 11622325 ; 11373029 ; 11373029 ; 11390372) ; 11390372) ; NSFC grant(11133003 ; NSFC grant(11133003 ; Newton Advanced Fellowship ; Newton Advanced Fellowship ; ERC Advanced Grant COSMIWAY ; ERC Advanced Grant COSMIWAY ; 'Recruitment Program of Global Youth Experts' of China ; 'Recruitment Program of Global Youth Experts' of China ; NAOC grant(Y434011V01) ; NAOC grant(Y434011V01) ; 973 programme grant(2015CB857005) ; 973 programme grant(2015CB857005) ; 11425312 ; 11425312 ; 11573033 ; 11573033 ; 11622325 ; 11622325 ; 11373029 ; 11373029 ; 11390372) ; 11390372)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000406839900073
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20058
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Key Lab Computat Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Durham, Sci Labs, Dept Phys, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England
Recommended Citation
GB/T 7714
Liao, Shihong,Gao, Liang,Frenk, Carlos S.,et al. The segregation of baryons and dark matter during halo assembly[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,470(2):2262-2269.
APA Liao, Shihong,Gao, Liang,Frenk, Carlos S.,Guo, Qi,&Wang, Jie.(2017).The segregation of baryons and dark matter during halo assembly.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,470(2),2262-2269.
MLA Liao, Shihong,et al."The segregation of baryons and dark matter during halo assembly".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470.2(2017):2262-2269.
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