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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…
Cusp or core? Revisiting the globular cluster timing problem in Fornax
Noah Meadows, Julio F. Navarro, Isabel Santos-Santos +2
We use N-body simulations to revisit the globular cluster (GC) ``timing problem'' in the Fornax dwarf spheroidal (dSph). In agreement with earlier work, we find that, due to dynami…
The Canada-France Imaging Survey: Reconstructing the Milky Way Star Formation History from its White Dwarf Population
Nicholas J. Fantin, Patrick Côté, Alan W. McConnachie +15
As the remnants of stars with initial masses 8 M, white dwarfs contain valuable information on the formation histories of stellar populations. In this paper, w…
To beta or not to beta: can higher-order Jeans analysis break the mass-anisotropy degeneracy in simulated dwarfs?
Anna Genina, Justin I. Read, Carlos S. Frenk +6
We test a non-parametric higher-order Jeans analysis method, GravSphere, on 32 simulated dwarf galaxies comparable to classical Local Group dwarfs like Fornax. The galaxies are sel…
Baryonic clues to the puzzling diversity of dwarf galaxy rotation curves
Isabel M. E. Santos-Santos, Julio F. Navarro, Andrew Robertson +7
We use a compilation of disc galaxy rotation curves to assess the role of the luminous component ("baryons") in the rotation curve diversity problem. As in earlier work, we find th…
The Milky Way total mass profile as inferred from Gaia DR2
Marius Cautun, Alejandro Benitez-Llambay, Alis J. Deason +7
We determine the Milky Way (MW) mass profile inferred from fitting physically motivated models to the Gaia DR2 Galactic rotation curve and other data. Using various hydrodynamical…
The Pristine survey -- VII. A cleaner view of the Galactic outer halo using blue horizontal branch stars
Else Starkenburg, Kris Youakim, Nicolas Martin +11
We use the Pristine survey CaHK narrow-band photometry, combined with the SDSS ugr photometry, to provide a cleaner sample of blue horizontal branch stars in the Galactic halo out…
Pristine IX: CFHT ESPaDOnS Spectroscopic Analysis of 115 Bright Metal-Poor Candidate Stars
Kim Venn, Collin Kielty, Federico Sestito +18
A chemo-dynamical analysis of 115 metal-poor candidate stars selected from the narrow-band Pristine photometric survey is presented based on CFHT high-resolution ESPaDoNS spectrosc…
Dwarfs or giants? Stellar metallicities and distances in the Canada-France-Imaging-Survey from multi-band photometry
Guillaume F. Thomas, Nicholaas Annau, Alan McConnachie +19
We present a new fully data-driven algorithm that uses photometric data from the Canada-France-Imaging-Survey (CFIS; ), Pan-STARRS 1 (PS1; ), and Gaia () to discriminat…
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 Formation of Ultra-Diffuse Galaxies in Clusters
Laura V. Sales, Julio F. Navarro, Louis Penafiel +3
We use the IllustrisTNG cosmological hydrodynamical simulation to study the formation of ultra-diffuse galaxies (UDGs) in galaxy clusters. We supplement the simulations with a real…
The missing dwarf galaxies of the Local Group
Azadeh Fattahi, Julio F. Navarro, Carlos S. Frenk
We study the Local Group (LG) dwarf galaxy population predicted by the \apostle CDM cosmological hydrodynamics simulations. These indicate that: (i)~the total mass within Mp…
Single-lined Spectroscopic Binary Star Candidates from a Combination of the RAVE and Gaia DR2 surveys
Danijela Birko, Tomaž Zwitter, Eva K. Grebel +11
The combination of the final version of the RAVE spectroscopic survey data release 6 with radial velocities and astrometry from Gaia DR2 allows us to identify and create a catalog…
The Ophiuchus stream progenitor: a new type of globular cluster and its possible Sagittarius connection
James M. M. Lane, Julio F. Navarro, Azadeh Fattahi +2
The Ophiuchus stream is a short arc-like stellar feature of uncertain origin located kpc North of the Galactic centre. New proper motions from the second data relea…
Satellites of Satellites: The Case for Carina and Fornax
Stephen A. Pardy, Elena D'Onghia, Julio Navarro +6
We use the Auriga cosmological simulations of Milky Way (MW)-mass galaxies and their surroundings to study the satellite populations of dwarf galaxies in CDM. As expected from p…
The R-Process Alliance: Discovery of a low-alpha, r-Process-Enhanced Metal-Poor Star in the Galactic Halo
Charli M. Sakari, Ian U. Roederer, Vinicius M. Placco +24
A new moderately r-process-enhanced metal-poor star, RAVE J093730.5-062655, has been identified in the Milky Way halo as part of an ongoing survey by the R-Process Alliance. The te…
The Pristine Dwarf-Galaxy survey - II. In-depth observational study of the faint Milky Way satellite Sagittarius II
Nicolas Longeard, Nicolas Martin, Else Starkenburg +11
We present an extensive study of the Sagittarius II (Sgr II) stellar system using MegaCam g and i photometry, narrow-band, metallicity-sensitive Calcium H&K doublet photometry, aug…