Author

E. Vitral

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Preprint Sep 2026

Signatures of dark subhaloes in dwarf spheroidal galaxies: II. Transient and localised kinematic features

We use controlled N-body simulations to investigate whether dark matter subhaloes leave detectable signatures in the internal kinematics of dwarf spheroidal galaxies. At each snapshot, we fit a velocity distribution function to stellar line-of-sight velocities and proper motions, construct normalised residual fields fo...

E. Vitral, Jorge Peñarrubia, R. P. van der Marel et al. · 0 citations

Preprint Sep 2026

Dynamical friction vs. subhalo heating in Cold Dark Matter haloes

The orbital evolution of massive stellar systems embedded in dark matter haloes is governed by competing processes. Dynamical friction removes orbital energy, whereas fluctuations in the gravitational field generated by dark matter subhaloes inject energy through stochastic heating. We investigate the balance between t...

Jorge Peñarrubia, P. di Cintio, E. Vitral et al. · 0 citations

Preprint Oct 2026

Central stellar depletion in the Draco dwarf from Subaru photometry

Dark matter subhaloes are a fundamental prediction of the standard cosmological model, but their low-mass population remains difficult to constrain observationally. Recent work has shown that interactions between subhaloes and dwarf spheroidal galaxies can induce large-scale, out-of-equilibrium fluctuations in their st...

E. Vitral, Kyosuke S. Sato, Jorge Peñarrubia et al. · 0 citations