8.6k citations · 33.3k across the 206 of their papers we have counts for
14 papers · 1 filter
A new fitting-function to describe the time evolution of a galaxy's gravitational potential
Hans J. T. Buist, Amina Helmi
We present a new simple functional form to model the evolution of a spherical mass distribution in a cosmological context. Two parameters control the growth of the system and this…
The shape of dark matter subhalos in the Aquarius simulations
Carlos Vera-Ciro, Laura V. Sales, Amina Helmi +1
We analyze the Aquarius simulations to characterize the shape of dark matter halos with peak circular velocity in the range 8<Vmax<200 km/s, and perform a convergence study using t…
An analytic distribution function for a massless cored stellar system in a cuspy dark matter halo
Maarten A. Breddels, Amina Helmi
We demonstrate the existence of distribution functions that can be used to represent spherical massless cored stellar systems embedded in cuspy dark matter halos with constant mild…
Internal kinematics and dynamical models of dwarf spheroidal galaxies around the Milky Way
Giuseppina Battaglia, Amina Helmi, Maarten Breddels
We review our current understanding of the internal dynamical properties of the dwarf spheroidal galaxies surrounding the Milky Way. These are the most dark matter dominated galaxi…
Dark satellites and the morphology of dwarf galaxies
Amina Helmi, L. V. Sales, E. Starkenburg +4
One of the strongest predictions of the LambdaCDM cosmological model is the presence of dark satellites orbiting all types of galaxies. We focus here on the dynamical effects of su…
Not too big, not too small: the dark halos of the dwarf spheroidals in the Milky Way
Carlos A. Vera-Ciro, Amina Helmi, Else Starkenburg +1
We present a new analysis of the Aquarius simulations done in combination with a semi-analytic galaxy formation model. Our goal is to establish whether the subhalos present in LCDM…
Schwarzschild models of the Sculptor dSph galaxy
Maarten A. Breddels, Amina Helmi, R. C. E. van den Bosch +2
We have developed a spherically symmetric dynamical model of a dwarf spheroidal galaxy using the Schwarzschild method. This type of modelling yields constraints both on the total m…
Euclid Definition Study Report
R. Laureijs, J. Amiaux, S. Arduini +216
Euclid is a space-based survey mission from the European Space Agency designed to understand the origin of the Universe's accelerating expansion. It will use cosmological probes to…
The Shape of Dark Matter Haloes in the Aquarius Simulations: Evolution and Memory
Carlos A. Vera-Ciro, Laura V. Sales, Amina Helmi +5
We use the high resolution cosmological N-body simulations from the Aquarius project to investigate in detail the mechanisms that determine the shape of Milky Way-type dark matter…
Study of the Sextans dwarf spheroidal galaxy from the DART CaII triplet survey
G. Battaglia, E. Tolstoy, A. Helmi +4
We use VLT/FLAMES intermediate resolution (R~6500) spectra of individual red giant branch stars in the near-infrared CaII triplet (CaT) region to investigate the wide-area metallic…
Assembly History and Structure of Galactic Cold Dark Matter Halos
Jie Wang, J. F. Navarro, C. S. Frenk +6
We use the Aquarius simulation series to study the imprint of assembly history on the structure of Galaxy-mass cold dark matter halos. Our results confirm earlier work regarding th…
The Origin of Extended Disk Galaxies at z=2
Laura V. Sales, Julio F. Navarro, Joop Schaye +4
Galaxy formation models typically assume that the size and rotation speed of galaxy disks are largely dictated by the mass, concentration, and spin of their surrounding dark matter…
Properties of Dark Matter Revealed by Astrometric Measurements of the Milky Way and Local Galaxies
Edward Shaya, Robert Olling, Massimo Ricotti +19
The fact that dark matter (DM), thus far, has revealed itself only on scales of galaxies and larger, again thrusts onto astrophysics the opportunity and the responsibility to confr…
Galactic Dynamics and Local Dark Matter
Steven R. Majewski, James Bullock, Andreas Burkert +13
The concordance Lambda Cold Dark Matter (Lambda-CDM) model for the formation of structure in the Universe, while remarkably successful at describing observations of structure on la…