Open AccessMerging history trees for dark matter haloes: tests of the Merging Cell Model in a CDM cosmology
Author(s) -
Lanzoni B.,
Mamon G. A.,
Guiderdoni B.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03164.x
Subject(s) - physics , dark matter , galaxy , astrophysics , cosmology , galaxy formation and evolution , dark matter halo , cold dark matter , halo , structure formation , redshift , autocorrelation , statistics , mathematics
The merging history of dark matter haloes is computed with the Merging Cell Model proposed by Rodrigues & Thomas. While originally discussed in the case of scale‐free power spectra, it is developed and tested here in the framework of the cold dark matter cosmology. The halo mass function, the mass distribution of progenitors and child haloes, as well as the probability distribution of formation times, have been computed and compared with the available analytic predictions. The halo autocorrelation function has also been obtained (a first for a semi‐analytic merging tree), and tested against analytic formulae. An overall good agreement is found between results of the model, and the predictions derived from the Press & Schechter theory and its extensions. More severe discrepancies appear when formulae that better describe N ‐body simulations are used for comparison. In many instances, the model can be a useful tool for following the hierarchical growth of structures. In particular, it is suitable for addressing the issue of the formation and evolution of galaxy clusters, as well as the population of Lyman‐break galaxies at high redshift, and their clustering properties.