Dark Matter Halo Mergers in the Millennium Simulation - Dependence on Environment

Details Dark Matter Halo Mergers in the Millennium Simulation - Dependence on Environment Dark Matter Halo Mergers in the Millennium Simulation - Dependence on Environment

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21430808h&link_type=abstract

American Astronomical Society, AAS Meeting #214, #308.08; Bulletin of the American Astronomical Society, Vol. 41, p.737

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We present a study of the specific major merger rate as a function of group membership, local environment, and redshift in a very large, 500h-1 mpc, cosmological N-body simulation, the Millennium Simulation. The goal of this work is to provide environmental diagnostics of major merger populations in order to test simulations against observations and provide further constraints on major merger driven galaxy evolution scenarios. We find that the severe tidal stripping of subhalos results in a scarcity of mergers between subhalos and an extremely long major merger timescale between a subhalo and its host in the absence of other subhalos. In contrast, in hosts with multiple subhalos major merger timescales are several times shorter. We suggest that this enhancement is due to inelastic bound collisions between subhalos. In light of these results, we predict that major mergers in group environments are dominated by mergers involving the central galaxy, that the specific merger rate is suppressed in groups, and that the frequency of fainter companions is enhanced for mergers and their remnants. We also observe an `assembly’ type bias in the major merger rate and advance a dynamical explanation for this trend which calls on extending the effects of tides and interactions between bound subhalos beyond the virial radii of locally dynamically dominant halos.

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