The Milky Way system in Lambda cold dark matter cosmological simulations

	The Milky Way system in Lambda cold dark matter cosmological simulations
	Guo, Qi1,2 ; Cooper, Andrew P.2; Frenk, Carlos 2; Helly, John 2; Hellwing, Wojciech A.2,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-11-21
卷号	454 期号:1 页码:550-559
关键词	galaxies: dwarf galaxies: formation galaxies: haloes galaxies: kinematics and dynamics Local Group dark matter
英文摘要	We apply a semi-analytic galaxy formation model to two high-resolution cosmological N-body simulations to investigate analogues of the Milky Way system. We select these according to observed properties of the Milky Way rather than by halo mass as in most previous work. For disc-dominated central galaxies with stellar mass (5-7) x 10(10) M-circle dot, the median host halo mass is 1.4 x 10(12) M-circle dot, with 32-68 per cent percentile spread in the range [0.86, 3.1] x 10(12) M-circle dot, consistent with dynamical measurements of the Milky Way halo mass. For any given halo mass, the probability of hosting a Milky Way system is low, with a maximum of similar to 20 per cent in haloes of mass similar to 10(12) M-circle dot. The model reproduces the V-band luminosity function and radial profile of the bright (M-V < -9) Milky Way satellites (r < 280 kpc). Galaxy formation in low-mass haloes is found to be highly stochastic, resulting in an extremely large scatter in the relation between MV (or stellar mass) for satellites and the depth of the subhalo potential well in which they live, as measured by the maximum of the rotation curve, V-max. Following Sawala et al., we account for baryonic effects on the growth of dark halo potentials by rescaling V-max. This adjustment alleviates the 'too big to fail' problem - we find that, in 35 per cent of Milky Way-like systems, three or fewer of the top 12 satellites (in order of V-max) have V-max > 30 km s(-1). Our model predicts that around half of the dark matter subhaloes with V-max > 20 km s(-1) host satellites fainter than M-V = -9 and so may be missing from existing surveys.
收录类别	SCI
语种	英语
WOS记录号	WOS:000363657000038
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5550]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 10012, Peoples R China 2.Univ Durham, Inst Computat Cosmol, Durham DH1 3LE, England 3.Univ Warsaw, Interdisciplinary Ctr Math & Computat Modeling IC, PL-02106 Warsaw, Poland
推荐引用方式 GB/T 7714	Guo, Qi,Cooper, Andrew P.,Frenk, Carlos,et al. The Milky Way system in Lambda cold dark matter cosmological simulations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,454(1):550-559.
APA	Guo, Qi,Cooper, Andrew P.,Frenk, Carlos,Helly, John,&Hellwing, Wojciech A..(2015).The Milky Way system in Lambda cold dark matter cosmological simulations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,454(1),550-559.
MLA	Guo, Qi,et al."The Milky Way system in Lambda cold dark matter cosmological simulations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 454.1(2015):550-559.