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Effects of correlation between merging steps on the global halo formation
Pan, Jun1; Wang, Yougang2; Chen, Xuelei2; Teodoro, Luis F. A.3
2008-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume389Issue:1Pages:461-468
AbstractThe 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.
KeywordMethods: Analytical Galaxies: Haloes Cosmology: Theory Large Scale Structure Of The Universe
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1365-2966.2008.13605.x
WOS KeywordDARK-MATTER HALOES ; EXCURSION SET MODEL ; MASS FUNCTION ; ELLIPSOIDAL COLLAPSE ; MOVING BARRIER ; SIMULATIONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000270677800046
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/1989
Collection南极天文中心
Affiliation1.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
Recommended Citation
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.
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