A Comparison of Simulated and Analytic Dark Matter Halo Major Merger Counts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Major mergers, as compared to accretion, can significantly disrupt the state of the resulting system. This can either be a source of noise (e.g. a mass temperature relation for galaxy clusters) or a source of signal (for instance a trigger for star formation). We focus on major merger counts, that is, mergers which have occurred within a certain recent time interval, as a function of mass and era, for dark matter halos from about 1013 h-1 Msun to 1015 h-1 Msun. At these scales, N-body (gravity only) simulations can be expect to be reliable. We use TREEPM N-body simulations to calculate these counts, and compare with predictions we derived using (extended) Press-Schechter theory.

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