All Outputs (50)

nIFTy galaxy cluster simulations – I. Dark matter and non-radiative models (2016)
Journal Article

We have simulated the formation of a galaxy cluster in a ? cold dark matter universe using 13 different codes modelling only gravity and non-radiative hydrodynamics (RAMSES, ART, AREPO, HYDRA and nine incarnations of GADGET). This range of codes incl... Read More about nIFTy galaxy cluster simulations – I. Dark matter and non-radiative models.

Major mergers going Notts: challenges for modern halo finders (2015)
Journal Article

Merging haloes with similar masses (i.e. major mergers) pose significant challenges for halo finders. We compare five halo-finding algorithms’ (ahf, hbt, rockstar, subfind, and velociraptor) recovery of halo properties for both isolated and cosmologi... Read More about Major mergers going Notts: challenges for modern halo finders.

nIFTy cosmology: comparison of galaxy formation models (2015)
Journal Article

We present a comparison of 14 galaxy formation models: 12 different semi-analytical models and 2 halo occupation distribution models for galaxy formation based upon the same cosmological simulation and merger tree information derived from it. The par... Read More about nIFTy cosmology: comparison of galaxy formation models.

Solving the puzzle of subhalo spins (2015)
Journal Article

Investigating the spin parameter distribution of subhalos in two high-resolution isolated halo simulations, recent work by Onions et al. suggested that typical subhalo spins are consistently lower than the spin distribution found for field halos. To... Read More about Solving the puzzle of subhalo spins.

Numerical simulation of two-dimensional Kelvin-Helmholtz instability using weakly compressible smoothed particle hydrodynamics (2015)
Journal Article

The growth of the Kelvin–Helmholtz instability generated at the interface between two ideal gases is studied by means of a Smoothed Particle Hydrodynamics (SPH) scheme suitable for multi-fluids. The SPH scheme is based on the continuity equation appr... Read More about Numerical simulation of two-dimensional Kelvin-Helmholtz instability using weakly compressible smoothed particle hydrodynamics.

Sussing merger trees: the impact of halo merger trees on galaxy properties in a semi-analytic model (2014)
Journal Article

A halo merger tree forms the essential backbone of a semi-analytic model for galaxy formation and evolution. Recent studies have pointed out that extracting merger trees from numerical simulations of structure formation is non-trivial; different tree... Read More about Sussing merger trees: the impact of halo merger trees on galaxy properties in a semi-analytic model.

Subhaloes gone Notts: subhaloes as tracers of the dark matter halo shape (2014)
Journal Article

We study the shapes of subhalo distributions from four dark-matter-only simulations of Milky Way-type haloes. Comparing the shapes derived from the subhalo distributions at high resolution to those of the underlying dark matter fields, we find the fo... Read More about Subhaloes gone Notts: subhaloes as tracers of the dark matter halo shape.

Sussing merger trees: the influence of the halo finder (2014)
Journal Article

Merger tree codes are routinely used to follow the growth and merger of dark matter haloes in simulations of cosmic structure formation. Whereas in Srisawat et. al. we compared the trees built using a wide variety of such codes, here we study the inf... Read More about Sussing merger trees: the influence of the halo finder.

Galaxy cluster mass reconstruction project – I. Methods and first results on galaxy-based techniques (2014)
Journal Article

This paper is the first in a series in which we perform an extensive comparison of various galaxy-based cluster mass estimation techniques that utilize the positions, velocities and colours of galaxies. Our primary aim is to test the performance of t... Read More about Galaxy cluster mass reconstruction project – I. Methods and first results on galaxy-based techniques.

Subhaloes gone Notts: the clustering properties of subhaloes (2014)
Journal Article

We present a study of the substructure finder dependence of subhalo clustering in the Aquarius Simulation. We run 11 different subhalo finders on the haloes of the Aquarius Simulation and study their differences in the density profile, mass fraction... Read More about Subhaloes gone Notts: the clustering properties of subhaloes.