  In the present article we are interested in further investigations for the
barotropic compressible Navier-Stokes system endowed with a non-local
capillarity we studied in [7]. Thanks to an accurate study of the associated
linear system using a Lagrangian change of coordinates, we provide more precise
energy estimates in terms of hybrid Besov spaces naturally depending on a
threshold frequency (which is determined in function of the physical parameter)
distinguishing the low and the high regimes. It allows us in particular to
prove the convergence of the solutions from the non-local to the local Korteweg
system. Another mathematical interest of this article is the study of the
effect of the Lagrangian change on the non-local capillary term.
