NAOC Open IR  > 星系宇宙学研究部
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
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号470期号:2页码:2262-2269
摘要The 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.
文章类型Article
关键词Methods: Numerical Galaxies: Haloes Galaxies: Structure
WOS标题词Science & Technology ; Physical Sciences
资助者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) ; 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
关键词[WOS]ANGULAR-MOMENTUM DISTRIBUTION ; GALAXY FORMATION ; GALACTIC HALOS ; DISK GALAXIES ; GAS ; SIMULATION ; ORIGIN ; PROTOGALAXIES ; COSMOLOGY ; UNIVERSE
收录类别SCI
语种英语
资助者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) ; 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研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000406839900073
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20058
专题星系宇宙学研究部
作者单位1.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
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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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