Journal article
Dark-ages reionization and galaxy formation simulation-II. Spin and concentration parameters for dark matter haloes during the epoch of reionization
PW Angel, GB Poole, AD Ludlow, AR Duffy, PM Geil, SJ Mutch, A Mesinger, JSB Wyithe
Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2016
DOI: 10.1093/mnras/stw737
Abstract
We use high-resolution N-body simulations to study the concentration and spin parameters of dark matter haloes in the mass range 108 M⊙ h-1 < M < 1011 M⊙ h-1 and redshifts 5 < z 5 concentration-mass (c(M)) relation that is almost flat and well described by a simple power law for both NFW and Einasto fits. The intrinsic scatter around the mean relation is Δcvir ~ 1 (or 20 per cent) at z = 5. We also find that the analytic model proposed by Ludlow et al. reproduces the mass and redshift dependence of halo concentrations. Our best-fitting Einasto shape parameter, α, depends on peak height, ν, in a manner that is accurately described by α = 0.0070ν2 + 0.1839. The distribution of the spin parame..
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Awarded by Horizon 2020 Framework Programme
Funding Acknowledgements
This research was supported by the Victorian Life Sciences Computation Initiative (VLSCI), grant ref. UOM0005, on its Peak Computing Facility hosted at the University of Melbourne, an initiative of the Victorian Government, Australia. Part of this work was performed on the gSTAR national facility at Swinburne University of Technology. gSTAR is funded by Swinburne and the Australian Government's Education Investment Fund. This research programme is funded by the Australian Research Council through the ARC Laureate Fellowship FL110100072 awarded to JSBW. ADL is financed by a COFUND Junior Research Fellowship. We thank Volker Springel for making the GADGET2 and SUBFIND codes available. We also thank N. Gnedin for useful comments on our manuscript.