Creating a galaxy lacking dark matter in a dark matter dominated
  universe
  We use hydrodynamical cosmological simulations to show that it is possible to
create, via tidal interactions, galaxies lacking dark matter in a dark matter
dominated universe. We select dwarf galaxies from the NIHAO project, obtained
in the standard Cold Dark Matter model and use them as initial conditions for
simulations of satellite-central interactions. After just one pericentric
passage on an orbit with a strong radial component, NIHAO dwarf galaxies can
lose up to 80 per~cent of their dark matter content, but, most interestingly,
their central ($\approx 8$~kpc) dark matter to stellar ratio changes from a
value of ${\sim}25$, as expected from numerical simulations and abundance
matching techniques, to roughly unity as reported for NGC1052-DF2 and
NGC1054-DF4. The stellar velocity dispersion drops from ${\sim}30$ ${\rm
km\,s^{-1}}$ before infall to values as low as $6\pm 2$~ ${\rm km\,s^{-1}}$.
These, and the half light radius around 3 kpc, are in good agreement with
observations from van Dokkum and collaborators. Our study shows that it is
possible to create a galaxy "without" dark matter starting from typical dwarf
galaxies formed in a dark matter dominated universe, provided they live in a
dense environment.
