11 papers
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…
HSTPROMO Internal Proper Motion Kinematics of Dwarf Spheroidal Galaxies: II. Velocity Anisotropy and Dark Matter Cusp Slope of Sculptor
Eduardo Vitral, Roeland P. van der Marel, Sangmo Tony Sohn +8
We analyze three epochs of HST imaging over 20 years for the Sculptor dwarf spheroidal galaxy, measuring precise proper motions for 119 stars and combining them with 1760 existing…
Signatures of dark subhalos in dwarf spheroidal galaxies: I. Fluctuations in surface density
Eduardo Vitral, Jorge Peñarrubia, Matthew G. Walker
Dark matter (DM) subhalos offer critical tests of cosmological models through their abundance and properties, yet most remain undetectable due to their lack of stars. We investigat…
: 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…
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…
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…