  We study the back-reaction associated with Hawking evaporation of an acoustic
canonical analogue black hole in a Bose-Einstein condensate. We show that the
emission of Hawking radiation induces a local back-reaction on the condensate,
perturbing it in the near-horizon region, and a global back-reaction in the
density distribution of the atoms. We discuss how these results produce useful
insights into the process of black hole evaporation and its compatibility with
a unitary evolution.
