  We investigate the static and spherically symmetric solutions of Einstein's
equations for a scalar field with non-canonical kinetic term, assumed to
provide both the dark matter and dark energy components of the Universe. In
particular, we give a prescription to obtain solutions (dark halos) whose
rotation curve v_c(r) is in good agreement with observational data. We show
that there exist suitable scalar field Lagrangians that allow to describe the
cosmological background evolution and the static solutions with a single dark
fluid.
