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Chemo-dynamics of the stellar component of the Sculptor dwarf galaxy II: dynamical properties and dark matter halo density
José María Arroyo Polonio, Raffaele Pascale, Giuseppina Battaglia +4
Dwarf galaxies satellite of the Milky Way are excellent laboratories for testing dark matter (DM) models and baryonic feedback implementation in simulations. The Sculptor 'classica…
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…
Chemo-dynamics of the stellar component of the Sculptor dwarf galaxy I: observed properties
José María Arroyo-Polonio, Giuseppina Battaglia, Guillaume F. Thomas +3
Aims. Recently, both the presence of multiple stellar chemo-kinematic components and rotation in the Sculptor dwarf spheroidal galaxy have been put into question. Therefore, we re-…
The density of the Milky Way's corona at through ram pressure stripping of the Draco dSph galaxy
Asger Grønnow, Filippo Fraternali, Federico Marinacci +4
Satellite galaxies within the Milky Way's (MW) virial radius are typically devoid of cold gas due to ram pressure stripping by the MW's corona. The density of th…
Binary star population of the Sculptor dwarf galaxy
José María Arroyo-Polonio, Giuseppina Battaglia, Guillaume F. Thomas +3
Aims: We aim to compute the binary fraction of "classical" dwarf spheroidal galaxies (dSphs) that are satellites of the Milky Way (MW). This value can offer insights into the binar…
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…
Forward and Back: Kinematics of the Palomar 5 Tidal Tails
Pete B. Kuzma, Annette M. N. Ferguson, Anna Lisa Varri +5
The tidal tails of Palomar 5 (Pal 5) have been the focus of many spectroscopic studies in an attempt to identify individual stars lying along the stream and characterise their kine…
Zero-metallicity hypernova uncovered by an ultra metal-poor star in the Sculptor dwarf spheroidal galaxy
Ása Skúladóttir, Stefania Salvadori, Anish M. Amarsi +9
Although true metal-free "Population III" stars have so-far escaped discovery, their nature, and that of their supernovae, is revealed in the chemical products left behind in the n…
Homogeneity in the early chemical evolution of the Sextans dwarf Spheroidal galaxy
R. Lucchesi, C. Lardo, F. Primas +10
We present the high-resolution spectroscopic analysis of two new extremely metal-poor stars (EMPS) candidates in the dwarf spheroidal galaxy Sextans. These targets were pre-selecte…
Kinematic and metallicity properties od the Aquarius dwarf galaxy from FORS2 MXU spectroscopy
L. Hermosa Muñoz, S. Taibi, G. Battaglia +10
Dwarf galaxies found in isolation in the Local Group (LG) are unlikely to have interacted with the large LG spirals, and therefore environmental effects should not be the main driv…
The Pristine survey X: a large population of low-metallicity stars permeates the Galactic disk
Federico Sestito, Nicolas F. Martin, Else Starkenburg +26
The orbits of the least chemically enriched stars open a window on the formation of our Galaxy when it was still in its infancy. The common picture is that these low-metallicity st…
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…
The Pristine Survey -- VI. The first three years of medium-resolution follow-up spectroscopy of Pristine EMP star candidates
David S. Aguado, Kris Youakim, Jonay I. González Hernández +27
We present the results of a 3-year long, medium-resolution spectroscopic campaign aimed at identifying very metal-poor stars from candidates selected with the CaHK, metallicity-sen…
The HST/ACS star formation history of the Tucana dwarf spheroidal galaxy: clues from the horizontal branch
A. Savino, E. Tolstoy, M. Salaris +2
We report a new star formation history for the Tucana dwarf spheroidal galaxy, obtained from a new look at a deep HST/ACS colour-magnitude diagram. We combined information from the…
Stellar 3-D kinematics in the Draco dwarf spheroidal galaxy
Davide Massari, Amina Helmi, Alessio Mucciarelli +3
Aims. We present the first three-dimensional internal motions for individual stars in the Draco dwarf spheroidal galaxy. Methods. By combining first-epoch $Telesco…
VLT/FLAMES high-resolution chemical abundances in Sculptor: a textbook dwarf spheroidal galaxy
Vanessa Hill, Ása Skúladóttir, Eline Tolstoy +12
We present detailed chemical abundances for 99 red-giant branch stars in the centre of the Sculptor dwarf spheroidal galaxy, obtained from high-resolution VLT/FLAMES spectroscopy.…
Tracing the formation of the Milky Way through ultra metal-poor stars
Federico Sestito, Nicolas Longeard, Nicolas F. Martin +11
We use Gaia DR2 astrometric and photometric data, published radial velocities and MESA models to infer distances, orbits, surface gravities, and effective temperatures for all ultr…
Pristine Dwarf-Galaxy Survey I: A detailed photometric and spectroscopic study of the very metal-poor Draco II satellite
Nicolas Longeard, Nicolas Martin, Else Starkenburg +17
We present a detailed study of the faint Milky Way satellite Draco II (Dra II) from deep CFHT/MegaCam broadband and photometry and narrow-band metallicity-sensitive CaHK ob…
MORGOTH: incorporating horizontal branch modelling into star formation history determinations
A. Savino, T. J. L. de Boer, M. Salaris +1
We present a new method that incorporates the horizontal branch morphology into synthetic colour-magnitude diagram based star formation history determinations. This method, we call…
Stellar chemo-kinematics of the Cetus dwarf spheroidal galaxy
S. Taibi, G. Battaglia, N. Kacharov +6
In order to minimize environmental effects and gain an insight into the internal mechanisms that shape the properties of the early-type dwarf systems, we study one of the few isola…
Tracing the stellar component of low surface brightness Milky Way Dwarf Galaxies to their outskirts I: Sextans
L. Cicuendez, G. Battaglia, M. Irwin +12
We present results from deep and very spatially extended CTIO/DECam and photometry (reaching out to 2 mag below the oldest MSTO and covering 20 deg) aroun…
The Pristine survey III: Spectroscopic confirmation of an efficient search for extremely metal-poor stars
K. Youakim, E. Starkenburg, D. S. Aguado +13
The Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the Ca II H & K absorption lines, designed to efficiently search for extremely meta…
Zinc in the Sculptor dwarf spheroidal galaxy
Ása Skúladóttir, Eline Tolstoy, Stefania Salvadori +2
From ESO VLT/FLAMES/GIRAFFE spectra, abundance measurements of Zn have been made in 100 individual red giant branch (RGB) stars in the Sculptor dwarf spheroidal galaxy. Th…
The Pristine survey I: Mining the Galaxy for the most metal-poor stars
Else Starkenburg, Nicolas Martin, Kris Youakim +22
We present the Pristine survey, a new narrow-band photometric survey focused on the metallicity-sensitive Ca H & K lines and conducted in the northern hemisphere with the wide-fiel…