8.6k citations · 33.3k across the 206 of their papers we have counts for
8 papers · 2 filters
Thick-disk evolution induced by the growth of an embedded thin disk
Álvaro Villalobos, Stelios Kazantzidis, Amina Helmi
We perform collisionless N-body simulations to investigate the evolution of the structural and kinematical properties of simulated thick disks induced by the growth of an embedded…
The Effect of Tidal Stripping on Composite Stellar Populations in Dwarf Spheroidal Galaxies
Laura V. Sales, Amina Helmi, Giuseppina Battaglia
We use N-body simulations to study the effects of tides on the kinematical structure of satellite galaxies orbiting a Milky Way-like potential. Our work is motivated by observation…
Galactic stellar haloes in the CDM model
A. P. Cooper, S. Cole, C. S. Frenk +9
We present six simulations of galactic stellar haloes formed by the tidal disruption of accreted dwarf galaxies in a fully cosmological setting. Our model is based on the Aquarius…
Orbital Eccentricity as a probe of Thick Disk Formation Scenarios
Laura V. Sales, Amina Helmi, Mario G. Abadi +7
We study the orbital properties of stars in four (published) simulations of thick disks formed by: i) accretion from disrupted satellites, ii) heating of a pre-existing thin disk b…
Chemical Composition of Extremely Metal-Poor Stars in the Sextans Dwarf Spheroidal Galaxy
W. Aoki, N. Arimoto, K. Sadakane +15
Chemical abundances of six extremely metal-poor ([Fe/H]<-2.5) stars in the Sextans dwarf spheroidal galaxy are determined based on high resolution spectroscopy (R=40,000) with the…
On the identification of substructure in phase-space using orbital frequencies
Facundo A. Gomez, Amina Helmi
We study the evolution of satellite debris to establish the most suitable space to identify past merger events. We confirm that the space of orbital frequencies is very promising i…
Mapping the Galactic Halo VIII: Quantifying substructure
Else Starkenburg, Amina Helmi, Heather L. Morrison +11
We have measured the amount of kinematic substructure in the Galactic halo using the final data set from the Spaghetti project, a pencil-beam high latitude sky survey. Our sample c…
Simulations of minor mergers. II. The phase-space structure of thick discs
Álvaro Villalobos, Amina Helmi
We analyse the phase-space structure of simulated thick discs that are the result of a significant merger between a disc galaxy and a satellite. Our main goal is to establish what…