Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-18
MNRAS, 312, 781 (2000)
Astronomy and Astrophysics
Astrophysics
10 pages, 8 figures, tar.gz file, MNRAS accepted for publication
Scientific paper
10.1046/j.1365-8711.2000.03164.x
The merging history of dark matter halos is computed with the Merging Cell Model proposed by Rodrigues & Thomas (1996). 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 halos, as well as the probability distribution of formation times, have been computed and compared to the available analytic predictions. The halo auto-correlation 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.
Guiderdoni Bruno
Lanzoni Barbara
Mamon Gary A.
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