Mark Vogelsberger

The Aquarius project: the subhaloes of galactic haloes

We have performed the largest ever particle simulation of a Milky Way sized dark matter halo, and present the most comprehensive convergence study for an individual dark matter halo carried out thus far. We have also simulated a sample of six ultrahighly resolved Milky Way sized haloes, allowing us to estimate the halo-to-halo scatter in substructure statistics. In our largest simulation, we resolve nearly 300 000 gravitationally bound subhaloes within the virialized region of the halo. Simulations of the same object differing in mass resolution by factors of up to 1800 accurately reproduce the largest subhaloes with the same mass, maximum circular velocity and position, and yield good convergence for the abundance and internal properties of dark matter substructures. We detect up to four generations of subhaloes within subhaloes, but contrary to recent claims, we find less substructure in subhaloes than in the main halo when regions of equal mean overdensity are compared. The overall substructure mass fraction is much lower in subhaloes than in the main halo. Extrapolating the main halos subhalo mass spectrum down to an Earth mass, we predict the mass fraction in substructure to be well below 3 per cent within 100 kpc, and to be below 0.1 per cent within the solar circle. The inner density profiles of subhaloes show no sign of converging to a fixed asymptotic slope and are well fitted by gently curving profiles of Einasto form. The mean concentrations of isolated haloes are accurately described by the fitting formula of Neto et al. down to maximum circular velocities of 1.5 km s(-1), an extrapolation over some five orders of magnitude in mass. However, at equal maximum circular velocity, subhaloes are more concentrated than field haloes, with a characteristic density that is typically similar to 2.6 times larger and increases with decreasing distance from halo centre.

Introducing the Illustris Project: simulating the coevolution of dark and visible matter in the Universe

We introduce the Illustris Project, a series of large-scale hydrodynamical simulations of galaxy formation. The highest resolution simulation, Illustris-1, covers a volume of

The diversity and similarity of simulated cold dark matter haloes

(106.5\,{\rm Mpc})^3

Properties of galaxies reproduced by a hydrodynamic simulation

, has a dark mass resolution of

A model for cosmological simulations of galaxy formation physics

{6.26 \times 10^{6}\,{\rm M}_\odot}

Introducing the Illustris project: the evolution of galaxy populations across cosmic time

, and an initial baryonic matter mass resolution of

The Illustris simulation: the evolving population of black holes across cosmic time

{1.26 \times 10^{6}\,{\rm M}_\odot}

Prospects for detecting supersymmetric dark matter in the Galactic halo.

. At

Phase‐space structure in the local dark matter distribution and its signature in direct detection experiments

z=0

Constraining self-interacting dark matter with the Milky Way’s dwarf spheroidals

gravitational forces are softened on scales of