Merger rates of dark matter haloes from merger trees in the extended Press-Schechter theory
| dc.creator | Hiotelis, Nicos | |
| dc.date | 2009-05-06 | |
| dc.date.accessioned | 2026-07-07T13:12:15Z | |
| dc.date.available | 2026-07-07T13:12:15Z | |
| dc.description | We construct merger trees based on the extended Press-Schechter theory (EPS) in order to study the merger rates of dark matter haloes over a range of present day mass ($10^{10}M_{\sun}\leq M_0 \leq10^{15}M_{\sun}$), progenitor mass $(5\times10^{-3}\leq ξ\leq1$) and redshift ($0\leq z\leq 3$). We used the first crossing distribution of a moving barrier of the form $B(S,z)=p(z)+q(z)S^γ$, proposed by Sheth & Tormen, to take into account the ellipsoidal nature of collapse. We find that the mean merger rate per halo $B_m/n$ depends on the halo mass $M$ as $M^{0.2}$ and on the redshift as $(\mathrm{d}δ_c(z)/\mathrm{d}z)^{1.1}$. Our results are in agreement with the predictions of N-body simulations and this shows the ability of merger-trees based on EPS theory to follow with a satisfactory agreement the results of N-body simulations and the evolution of structures in a hierarchical Universe. | |
| dc.description | 7 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/0905.0793 | |
| dc.identifier | http://arxiv.org/abs/0905.0793 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/229525 | |
| dc.subject | Cosmology and Nongalactic Astrophysics | |
| dc.title | Merger rates of dark matter haloes from merger trees in the extended Press-Schechter theory | |
| dc.type | text |