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- W2955661368 startingPage "3663" @default.
- W2955661368 abstract "ABSTRACT We study the impact of numerical parameters on the properties of cold dark matter haloes formed in collisionless cosmological simulations. We quantify convergence in the median spherically averaged circular velocity profiles for haloes of widely varying particle number, as well as in the statistics of their structural scaling relations and mass functions. In agreement with prior work focused on single haloes, our results suggest that cosmological simulations yield robust halo properties for a wide range of gravitational softening parameters, ϵ, provided: (1) ϵ is not larger than a ‘convergence radius’, rconv, which is dictated by two-body relaxation and determined by particle number, and (2) a sufficient number of time-steps are taken to accurately resolve particle orbits with short dynamical times. Provided these conditions are met, median circular velocity profiles converge to within ≈10 per cent for radii beyond which the local two-body relaxation time-scale exceeds the Hubble time by a factor $kappa equiv t_{rm relax}/t_{rm H}rm{,, buildrelgt over sim ,,}0.177$, with better convergence attained for higher κ. We provide analytic estimates of rconv that build on previous attempts in two ways: first, by highlighting its explicit (but weak) softening-dependence and, second, by providing a simpler criterion in which rconv is determined entirely by the mean inter-particle spacing, l, for example better than 10 per cent convergence in circular velocity for $rrm{,, buildrelgt over sim ,,}0.05, l$. We show how these analytic criteria can be used to assess convergence in structural scaling relations for dark matter haloes as a function of their mass or maximum circular speed." @default.
- W2955661368 created "2019-07-12" @default.
- W2955661368 creator A5020847721 @default.
- W2955661368 creator A5021273735 @default.
- W2955661368 creator A5055264885 @default.
- W2955661368 date "2019-07-04" @default.
- W2955661368 modified "2023-10-15" @default.
- W2955661368 title "Numerical convergence of simulations of galaxy formation: the abundance and internal structure of cold dark matter haloes" @default.
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