A Comparison of Simulated and Analytic Major Merger Counts

Abstract

We use large volume, high resolution, N-body simulations of 3 different $\Lambda$CDM models, with different clustering strengths, to generate dark matter halo merging histories. Over the reliable range of halo masses, roughly galaxy groups to rich clusters of galaxies, we quantify the number density of major mergers for two different time intervals and compare with analytic predictions based on the extended Press-Schechter (1974) theory.

24 pages, 18 figures. Comments welcome. Final version to appear MNRAS, helpful suggestions from referee and others incorporated

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• On The Assembly History of Dark Matter Haloes
• The Chandra Multiwavelength Project: Optical Followup of Serendipitous Chandra Sources
• Simulating Subhalos at High Redshift: Merger Rates, Counts, and Types
• Dark matter halo abundances, clustering and assembly histories at high redshift
• The Formation Histories of Galaxy Clusters
• Future Evolution of Bound Superclusters in an Accelerating Universe
• PINOCCHIO and the hierarchical build-up of dark matter haloes
• Effects of the size of cosmological N-Body simulations on physical quantities -- I: Mass Function
• Testing the Modified Press-Schechter Model against N-Body Simulations
• The Cosmic Evolution of Halo Pairs: I. Global Trends
• The SZ Effect as a Probe of Non-Gravitational Entropy in Groups and Clusters of Galaxies
• Extended Press-Schechter theory and the density profiles of dark matter haloes
• Halo mass function in scale invariant models
• The Interplay of Cluster and Galaxy Evolution
• Effects of the size of cosmological N-body simulations on physical quantities II-. Halo formation and destruction rate