8.6k citations · 33.3k across the 206 of their papers we have counts for
17 papers · 2 filters
Phase-space structure in the local dark matter distribution and its signature in direct detection experiments
Mark Vogelsberger, Amina Helmi, Volker Springel +6
We study predictions for dark matter phase-space structure near the Sun based on high-resolution simulations of six galaxy halos taken from the Aquarius Project. The local DM densi…
The Arcturus Moving Group: Its Place in the Galaxy
Mary E. K. Williams, Ken C. Freeman, Amina Helmi +1
The Arcturus moving group is a well-populated example of phase space substructure within the thick disk of our Galaxy. Traditionally regarded as the remains of a dissolved open clu…
The Diversity and Similarity of Simulated Cold Dark Matter Halos
Julio F. Navarro, Aaron Ludlow, Volker Springel +6
We study the mass, velocity dispersion, and anisotropy profiles of CDM halos using a suite of N-body simulations of unprecedented numerical resolution (the {\it Aquarius Project…
On the common mass scale of the Milky Way satellites
Yang-Shyang Li, Amina Helmi, Gabriella De Lucia +1
We use a hybrid approach that combines high-resolution simulations of the formation of a Milky Way-like halo with a semi-analytic model of galaxy formation to study the mass conten…
Estimation of the Tilt of the Stellar Velocity Ellipsoid from RAVE and Implications for Mass Models
A. Siebert, O. Bienaymé, J. Binney +16
We present a measure of the inclination of the velocity ellipsoid at 1 kpc below the Galactic plane using a sample of red clump giants from the RAVE DR2 release. We find that the v…
Diffuse interstellar bands in RAVE Survey spectra
U. Munari, L. Tomasella, M. Fiorucci +19
We have used spectra of hot stars from the RAVE Survey in order to investigate the visibility and properties of five diffuse interstellar bands previously reported in the literatur…
Group infall of substructures on to a Milky Way-like dark halo
Yang-Shyang Li, Amina Helmi
We report the discovery that substructures/subhaloes of a galaxy-size halo tend to fall in together in groups in cosmological simulations, something that may explain the oddity of…
The Galaxy and its stellar halo - insights from a hybrid cosmological approach
Gabriella De Lucia, Amina Helmi
We use a series of high-resolution N-body simulations of a `Milky-Way' halo, coupled to semi-analytic techniques, to study the formation of our own Galaxy and of its stellar halo.…
The Radial Velocity Experiment (RAVE): second data release
T. Zwitter, A. Siebert, U. Munari +51
We present the second data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities (RVs) and stellar atmosphere parameters…
On the genealogy of the Orphan Stream
L. V. Sales, A. Helmi, E. Starkenburg +6
We use N-body simulations to explore the origin and a plausible orbit for the Orphan Stream, one of the faintest substructures discovered so far in the outer halo of our Galaxy. We…
The Galaxy and its stellar halo: insights on their formation from a hybrid cosmological approach
Gabriella De Lucia, Amina Helmi
We use a series of high-resolution simulations of a `Milky-Way' halo coupled to semi-analytic methods to study the formation of our own Galaxy and of its stellar halo. The physical…
Fashionably Late? Building up the Milky Way's Inner Halo
H. L. Morrison, A. Helmi, J. Sun +9
Using a sample of 248 metal-poor stars (RR Lyraes, red giants and RHB stars) which is remarkable for the accuracy of its 6-D kinematical data, we find a new component for the local…
The stellar halo of the Galaxy
Amina Helmi
Stellar halos may hold some of the best preserved fossils of the formation history of galaxies. They are a natural product of the merging processes that probably take place during…
Simulations of minor mergers. I. General properties of thick disks
Álvaro Villalobos, Amina Helmi
We present simulations of the formation of thick disks via the accretion of two-component satellites onto a pre-existing thin disk. Our goal is to establish the detailed characteri…
The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
G. Battaglia, A. Helmi, E. Tolstoy +3
We present VLT/FLAMES spectroscopic observations (R~6500) in the CaII triplet region for 470 probable kinematic members of the Sculptor (Scl) dwarf spheroidal galaxy. The accurate…
Galactic kinematics with RAVE data: I. The distribution of stars towards the Galactic poles
L. Veltz, O. Bienaymé, K. C. Freeman +16
We analyze the distribution of G and K type stars towards the Galactic poles using RAVE and ELODIE radial velocities, 2MASS photometric star counts, and UCAC2 proper motions. The c…
The Unorthodox Orbits of Substructure Halos
Aaron D. Ludlow, Julio F. Navarro, Volker Springel +3
(Abridged) We use cosmological N-body simulations to study the properties of substructure halos in galaxy-sized dark matter halos. We extend prior work on the subject by considerin…