237 citations · 1.7k across the 21 of their papers we have counts for
21 papers
A 3D view of dwarf galaxies with Gaia and VLT/FLAMES II. The Sextans dwarf spheroidal
Eline Tolstoy, Giuseppina Battaglia, José María Arroyo-Polonio +7
The Sextans dwarf spheroidal galaxy has been challenging to study in a comprehensive way as it is highly extended on the sky, with an uncertain but large tidal radius of between 80…
A 3D view of dwarf galaxies with Gaia and VLT/FLAMES I. The Sculptor dwarf spheroidal
Eline Tolstoy, Ása Skúladóttir, Giuseppina Battaglia +12
We present a new homogeneous survey of VLT/FLAMES LR8 line-of-sight radial velocities (vlos) for 1604 resolved red giant branch stars in the Sculptor dwarf spheroidal galaxy. In ad…
Near-infrared colors of minor planets recovered from VISTA - VHS survey (MOVIS)
M. Popescu, J. Licandro, D. Morate +6
The Sloan Digital Sky Survey (SDSS) and Wide-field Infrared Survey Explorer (WISE) provide information about the surface composition of about 100,000 minor planets. The resulting v…
Carbon and nitrogen abundances of individual stars in the Sculptor dwarf spheroidal galaxy
C. Lardo, G. Battaglia, E. Pancino +7
We present [C/Fe] and [N/Fe] abundance ratios and CH(λ4300) and S(λ3883) index measurements for 94 red giant branch (RGB) stars in the Sculptor dwarf spheroidal galaxy from VLT/VIM…
The AGB population in IC 1613 using JHK photometry
L. F. Sibbons, S. G. Ryan, M. Irwin +1
A member of the Local Group, IC 1613 is a gas rich irregular dwarf galaxy that appears to have formed stars continuously over the last 10 Gyr and is relatively independent of exter…
A Deep, Wide-Field Study of Holmberg II with Suprime-Cam: Evidence for Ram Pressure Stripping
Edouard J. Bernard, Annette M. N. Ferguson, Michael K. Barker +3
We present a deep, wide-field optical study of the M81 group dwarf galaxy Holmberg II (HoII) based on Subaru/Suprime-Cam imaging. Individual stars are resolved down to I~25.2, i.e.…
The AGB population of NGC 6822: distribution and the C/M ratio from JHK photometry
L. F. Sibbons, S. G. Ryan, M. -R. L. Cioni M. Irwin +1
NGC 6822 is an irregular dwarf galaxy and part of the Local Group. Its close proximity and apparent isolation provide a unique opportunity to study galactic evolution without any o…
VLT/FLAMES spectroscopy of Red Giant Branch stars in the Carina dwarf spheroidal galaxy
B. Lemasle, V. Hill, E. Tolstoy +6
The ages of individual Red Giant Branch stars (RGB) can range from 1 Gyr old to the age of the Universe, and it is believed that the abundances of most chemical elements in their p…
The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies with GEAR
Yves Revaz, Pascale Jablonka
We present a fully parallel chemo-dynamical Tree/SPH code, GEAR, which allows to perform high resolution simulations with detailed chemical diagnostics. Starting from the public ve…
A high resolution VLT/FLAMES study of individual stars in the centre of the Fornax dwarf spheroidal galaxy
B. Letarte, V. Hill, E. Tolstoy +13
For the first time we show the detailed late-stage chemical evolution history of small nearby dwarf spheroidal galaxy in the Local Group. We present the results of a high resolutio…
A Keck/DEIMOS spectroscopic survey of the faint M31 satellites And IX, And XI, And XII, and And XIII
M. L. M. Collins, S. C. Chapman, M. J. Irwin +8
We present the first spectroscopic analysis of the faint M31 satellite galaxies, AndXI and AndXIII, and a reanalysis of existing spectroscopic data for two further faint companions…
The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies
Y. Revaz, P. Jablonka, T. Sawala +8
We present a large sample of fully self-consistent hydrodynamical Nbody/Tree-SPH simulations of isolated dwarf spheroidal galaxies (dSphs). It has enabled us to identify the key ph…
Blue straggler stars in dwarf spheroidal galaxies II: Sculptor and Fornax
M. Mapelli, E. Ripamonti, G. Battaglia +4
The existence of blue straggler stars (BSSs) in dwarf spheroidal galaxies (dSphs) is still an open question. In fact, many BSS candidates have been observed in the Local Group dSph…
Life at the Periphery of the Local Group: the kinematics of the Tucana Dwarf Galaxy
F. Fraternali, E. Tolstoy, M. Irwin +1
Dwarf spheroidal galaxies in the Local Group are usually located close to the Milky Way or M31. Currently, there are two clear exceptions to this rule, and the Tucana dwarf galaxy…
The mass content of the Sculptor dwarf spheroidal galaxy
G. Battaglia, A. Helmi, E. Tolstoy +1
We present a new determination of the mass content of the Sculptor dwarf spheroidal galaxy, based on a novel approach which takes into account the two distinct stellar populations…
A new view of the dwarf spheroidal satellites of the Milky Way from VLT/FLAMES: Where are the very metal poor stars?
Amina Helmi, M. J. Irwin, E. Tolstoy +13
As part of the Dwarf galaxies Abundances and Radial-velocities Team (DART) program, we have measured the metallicities of a large sample of stars in four nearby dwarf spheroidal ga…
An Optical Velocity for the Phoenix Dwarf Galaxy
Mike Irwin, Eline Tolstoy
We present the results of a VLT observing program carried out in service mode using FORS1 on ANTU in Long Slit mode to determine the optical velocities of nearby low surface bright…
Using the Ca II Triplet to Trace Abundance Variations in Individual Red Giant Branch stars in Three Nearby Galaxies
Eline Tolstoy, Michael J. Irwin, Andrew A. Cole +3
Spectroscopic abundance determinations for stars spanning a Hubble time in age are necessary in order to unambiguously determine the evolutionary histories of galaxies. Using FORS1…
The evolution of Omega(HI) and the epoch of formation of damped Lyman-alpha absorbers
Celine Peroux, Richard G. McMahon, Lisa J. Storrie-Lombardi +1
We present a study of the evolution of the column density distribution, f(N,z), and total neutral hydrogen mass in high-column density quasar absorbers using candidates from a rece…
The Optical Velocity of the Antlia Dwarf Galaxy
Eline Tolstoy, Michael Irwin
We present the results of a VLT observing program carried out in service mode using FORS1 on ANTU in Long Slit mode to determine the optical velocities of nearby low surface bright…
APM z>4 QSO Survey: Spectra and Intervening Absorption Systems
L. J. Storrie-Lombardi, R. G. McMahon, M. J. Irwin +1
The APM multicolor survey for bright z > 4 objects, covering 2500 deg^2 of sky to m(R)~19, resulted in the discovery of thirty-one quasars with z > 4. High signal-to-noise optical…