180 citations · 830 across the 31 of their papers we have counts for
32 papers
Characterizing the disruption of Böotes III: a missing link in the Galactic halo?
Jaclyn Jensen, Daniel A. Boyea, Alan W. McConnachie +14
The Böotes III (Boo3) dwarf galaxy has long been suspected of being the progenitor of Styx, a ~50°-long stellar stream that was simultaneously discovered in the same region of sky.…
Structural Diversity Among the Milky Way's Dwarf Spheroidal Satellites
Matthew G. Walker, Raphaël Errani, Andrew B. Pace +3
We fit a flexible double power-law (`') model to the stellar density fields observed for the Milky Way's known dwarf spheroidal satellite galaxies. We show that where standard…
Galactic tides and the outer density profile of the Sculptor and Ursa Minor dwarf spheroidals
Daniel A. Boyea, Julio F. Navarro, Jaclyn Jensen +1
Most dwarf spheroidal (dSph) satellites of the Milky Way follow exponential surface density profiles that decline sharply in the outer regions. The Sculptor (Scl) and Ursa Minor (U…
Collisional Dynamics of Stars and Dark Matter in Ultra-Faint Galaxies
Raphaël Errani, Nicolas Esser, Jorge Peñarrubia +1
We use controlled N-body simulations to study the collisional exchange of energy between stars and dark matter in ultra-faint galaxies. We find that dynamical friction between star…
Tailored mass estimators for Milky Way dwarf Spheroidals
Sofia L. Splawska, Raphaël Errani, Jorge Peñarrubia +1
Assuming spherical symmetry and dynamical equilibrium within a given gravitational potential, a dwarf spheroidal (dSph) galaxy's globally averaged stellar velocity dispersion depen…
Cored galaxies in cuspy dark matter halos
Fernando Valenciano, Jorge Martin Camalich, Arianna Di Cintio +4
We investigate constraints on the inner stellar density profile from photometric data of dwarf spheroidal and ultra-faint dwarf galaxies. Our aim is to clarify under what condition…
: Tidal Disruption in Crater 2 and Formation of Diffuse Dwarf Galaxies in the Local Group
Guilherme Limberg, Alexander P. Ji, Ting S. Li +19
We present results of a spectroscopic campaign around the diffuse dwarf galaxy Crater 2 (Cra2) and its tidal tails as part of the Southern Stellar Stream Spectroscopic Survey ($S^5…
Gravothermal expansion of dwarf spheroidal galaxies heated by dark subhaloes
Jorge Peñarrubia, Raphaël Errani, Eduardo Vitral +1
We use analytical and -body methods to study the evolution of dwarf spheroidal galaxies (dSphs) embedded in dark matter (DM) haloes that host a sizeable subhalo population. Dark…
Stellar Mass Segregation in Dark Matter Halos
Raphaël Errani, Jorge Peñarrubia, Matthew G. Walker
We study the effect of stellar mass segregation driven by collisional relaxation within the potential well of a smooth dark matter halo. This effect is of particular relevance for…
GHOST commissioning science results -- IV: Chemodynamical analyses of Milky Way satellites Sagittarius II and Aquarius II
Daria Zaremba, Kim Venn, Christian R. Hayes +28
We present Gemini/GHOST high-resolution spectra of five stars observed in two low surface brightness Milky Way satellites, Sagittarius II (Sgr2) and Aquarius II (Aqu2). For Aqu2, t…
Impulsive mixing of stellar populations in dwarf spheroidal galaxies
Raphaël Errani, Matthew G. Walker, Simon Rozier +2
We study the response of mono-energetic stellar populations with initially isotropic kinematics to impulsive and adiabatic changes to an underlying dark matter potential. Half-ligh…
The Pristine survey. XXVI. Chemical abundances of subgiant stars of the extremelymetal-poor stream C-19
P. Bonifacio, E. Caffau, P. François +17
Context: The C-19 stellar stream is the most metal-poor stream known to date. While its width and velocity dispersion indicate a dwarf galaxy origin, its metallicity spread and abu…
Capture of field stars by dark substructures
Jorge Peñarrubia, Raphaël Errani, Matthew G. Walker +2
We use analytical and -body methods to study the capture of field stars by gravitating substructures moving across a galactic environment. The majority of stars captured by a su…
Collisionless relaxation from near equilibrium configurations: Linear theory and application to tidal stripping
Simon Rozier, Raphaël Errani
Placed slightly out of dynamical equilibrium, an isolated stellar system quickly returns towards a steady virialized state. We study this process of collisionless relaxation using…
Charting the Galactic acceleration field II. A global mass model of the Milky Way from the STREAMFINDER Atlas of Stellar Streams detected in Gaia DR3
Rodrigo Ibata, Khyati Malhan, Wassim Tenachi +17
We present an atlas and follow-up spectroscopic observations of 87 thin stream-like structures detected with the STREAMFINDER algorithm in Gaia DR3, of which 29 are new discoveries…
The discovery of the faintest known Milky Way satellite using UNIONS
Simon E. T. Smith, William Cerny, Christian R. Hayes +14
We present the discovery of Ursa Major III/UNIONS 1, the least luminous known satellite of the Milky Way, which is estimated to have an absolute V-band magnitude of $+2.2^{+0.4}_{-…
Micro galaxies in LCDM
Raphaël Errani, Rodrigo Ibata, Julio F. Navarro +2
A fundamental prediction of the Lambda Cold Dark Matter (LCDM) cosmology is the centrally divergent cuspy density profile of dark matter haloes. Density cusps render CDM haloes res…
Ursa Major III/UNIONS 1: the darkest galaxy ever discovered?
Raphaël Errani, Julio F. Navarro, Simon E. T. Smith +1
The recently discovered stellar system Ursa Major III/UNIONS 1 (UMa3/U1) is the faintest known Milky Way satellite to date. With a stellar mass of and a…
Dark matter halo cores and the tidal survival of Milky Way satellites
Raphaël Errani, Julio F. Navarro, Jorge Peñarrubia +2
The cuspy central density profiles of cold dark matter (CDM) haloes make them highly resilient to disruption by tides. Self-interactions between dark matter particles, or the cycli…
Revisiting a disky origin for the faint branch of the Sagittarius stellar stream
Pierre-Antoine Oria, Rodrigo Ibata, Pau Ramos +2
We investigate ways to produce the bifurcation observed in the stellar stream of the Sagittarius dwarf galaxy (Sgr). Our method consists in running -body simulations of Sgr fall…
The Pristine survey XVIII: C-19: Tidal debris of a dark matter-dominated globular cluster?
Raphaël Errani, Julio F. Navarro, Rodrigo Ibata +12
The recently discovered C-19 stellar stream is a collection of kinematically associated metal-poor stars in the halo of the Milky Way lacking an obvious progenitor. The stream span…
The Pristine survey -- XVII. The C-19 stream is dynamically hot and more extended than previously thought
Zhen Yuan, Nicolas F. Martin, Rodrigo A. Ibata +22
The C-19 stream is the most metal poor stellar system ever discovered, with a mean metallicity . Its low metallicity dispersion ( 0.18 at…
Galactic tides and the Crater II dwarf spheroidal: a challenge to LCDM?
Alexandra Borukhovetskaya, Julio F. Navarro, Raphael Errani +1
The unusually low velocity dispersion and large size of Crater II pose a challenge to our understanding of dwarf galaxies in the Lambda Cold Dark Matter (LCDM) cosmogony. The low v…
Structure and kinematics of tidally limited satellite galaxies in LCDM
Raphaël Errani, Julio F. Navarro, Rodrigo Ibata +1
We use N-body simulations to model the tidal evolution of dark matter-dominated dwarf spheroidal galaxies embedded in cuspy Navarro-Frenk-White subhalos. Tides gradually peel off s…