Effects of correlation between merging steps on the global halo formation

	Effects of correlation between merging steps on the global halo formation
	Pan, Jun 1; Wang, Yougang 2; Chen, Xuelei 2; Teodoro, Luis F. A.3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2008-09-01
卷号	389 期号:1 页码:461-468
关键词	methods: analytical galaxies: haloes cosmology: theory large scale structure of the Universe
ISSN号	0035-8711
英文摘要	The excursion set theory of halo formation is modified by adopting the fractional Brownian motion, to account for possible correlation between merging steps. We worked out analytically the conditional mass function, halo merging rate and formation time distribution in the spherical collapse model. We also developed an approximation for the ellipsoidal collapse model and applied it to the calculation of the conditional mass function and the halo formation time distribution. For models in which the steps are positively correlated, the halo merger rate is enhanced when the accreted mass is less than similar to 25M*, while for the negatively correlated case this rate is reduced. Compared with the standard model in which the steps are uncorrelated, the models with positively correlated steps produce more aged population in small mass haloes and more younger population in large mass haloes, while for the models with negatively correlated steps the opposite is true. An examination of simulation results shows that a weakly positive correlation between successive merging steps appears to fit best. We have also found a systematic effect in the measured mass function due to the finite volume of simulations. In future work, this will be included in the halo model to accurately predict the three-point correlation function estimated from simulations.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DARK-MATTER HALOES ; EXCURSION SET MODEL ; MASS FUNCTION ; ELLIPSOIDAL COLLAPSE ; MOVING BARRIER ; SIMULATIONS
收录类别	SCI
语种	英语
WOS记录号	WOS:000270677800046
公开日期	2011-12-30
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1989]
专题	紫金山天文台_南极天文中心
作者单位	1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
推荐引用方式 GB/T 7714	Pan, Jun,Wang, Yougang,Chen, Xuelei,et al. Effects of correlation between merging steps on the global halo formation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,389(1):461-468.
APA	Pan, Jun,Wang, Yougang,Chen, Xuelei,&Teodoro, Luis F. A..(2008).Effects of correlation between merging steps on the global halo formation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,389(1),461-468.
MLA	Pan, Jun,et al."Effects of correlation between merging steps on the global halo formation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 389.1(2008):461-468.