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The mass distribution in and around the Local Group
Ewoud Wempe, Simon D. M. White, Amina Helmi +2
Our Galaxy, Andromeda and their companion dwarf galaxies form the Local Group. Most of the mass in and around it is believed to be dark matter rather than gas or stars, so its dist…
On the chaos induced by the Galactic bar on the orbits of nearby halo stars
Hanneke C. Woudenberg, Amina Helmi
Many of the Milky Way's accreted substructures have been discovered and studied in the space of energy , and angular momentum components and . In a static axisym…
Chemical characterisation of small substructures in the local stellar halo
Emma Dodd, Tadafumi Matsuno, Amina Helmi +5
The local stellar halo of the Milky Way is known to contain the debris from accreted dwarf galaxies and globular clusters, in the form of stellar streams and over-densities in the…
The effect of environment on the mass assembly history of the Milky Way and M31
Ewoud Wempe, Amina Helmi, Simon D. M. White +2
We study the mass growth histories of the halos of Milky Way and M31 analogues formed in constrained cosmological simulations of the Local Group. These simulations constitute a fai…
First measurement of the triaxiality of the inner dark matter halo of the Milky Way
Hanneke C. Woudenberg, Amina Helmi
Stellar streams are particularly sensitive probes of the mass distribution of galaxies. In this work, we focus on the Helmi Streams, the remnants of an accreted dwarf galaxy orbiti…
The chemical evolution of the dwarf Spheroidal galaxy Sextans
R. Theler, P. Jablonka, R. Lucchesi +11
We present the analysis of the FLAMES dataset targeting the central 25 arcmin region of the Sextans dSph. This dataset is the third major part of the high resolution spectroscopic…