The Equilibrium Structure of Dark Matter Halos

Details The Equilibrium Structure of Dark Matter Halos The Equilibrium Structure of Dark Matter Halos

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.0502b&link_type=abstract

American Astronomical Society, DDA meeting #38, #5.02

Mathematics

Logic

Scientific paper

The far future provides an excellent laboratory for studying cosmological structures. The eventual dominance of the cosmological constant causes the universe to enter a phase of exponential deSitter expansion during which dark matter halos are allowed to relax without interruptions from mass accretion. Halos in equilibrium have a greatly simplified radial phase space profile characterized by a single zero-velocity surface that unambiguously defines the halo edge. Using of suite of N-body simulations evolved to scale factor a = 100 in ΛCDM and ΛWDM universes, I present the equilibrium structure of halos and investigate the importance of mass accretion in setting this structure. Using these simulations, I present a modified fit to the mass accretion of Wechsler et al. (2002) that better characterizes halo growth at all epochs. At the end of the simulations, we recover density profiles and phase space structures that are virtually unchanged between the CDM and WDM cosmologies. A systematic concentration shift can be characterized in terms of the halo formation epoch, ac. Once substructure effects are removed the phase space distributions are equally unchanged. From this, we conclude that the method of mass accretion is not the driving process in setting the equilibrium halo structure.

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