Julio F. Navarro

TL;DR: In this paper, the authors used the data from ESA's Gaia mission (GDR2) to identify members of the Orphan Stream (OS) across the whole sky, which is traced above and below the celestial equator and in both Galactic hemispheres, thus increasing its visible length to ∼210° equivalent to ∼150 kpc in physical extent.

TL;DR: In this article, the authors examined the effect of tidal stripping on the relative velocities of isolated dwarfs in the Local Group and found that the resulting velocity dispersions are inconsistent with the predictions from Modified Newtonian Dynamics, which poses a possibly insurmountable challenge to that scenario.

TL;DR: In this paper, the authors examine recent suggestions that substructure in cold dark matter (CDM) halos may be in conflict with the presence of thin, dynamically fragile stellar disks.

TL;DR: In this article, the formation of dark matter (DM) cores in dwarf galaxies simulated with the EAGLE model of galaxy formation is examined. But the dependence of the inner DM content of dwarfs on ρth hinders robust predictions and the interpretation of observations.

TL;DR: In this article, the authors use the Millennium Simulation series to study how the dynamical state of dark matter haloes affects the relation between mass and concentration and find that a large fraction of massive systems are identified when they are substantially out of equilibrium and in a particular phase of their dynamical evolution: the more massive the halo, the more likely it is found at a transient stage of high concentration.