Superwind meets obstacles in starbursts galaxies: non-thermal radiation

The gas in starburst regions is heated up by the numerous supernova explosions and the winds of
young massive stars. This hot gas expands driven by thermal pressure and outbreaks into the galactic halo as
a powerful out
ow known as superwind. The interaction of this multi-phase wind with cooler clumps of matter
swept-up from the galactic disk or massive clouds in the halo leads to the production of shock waves where
particles can be accelerated up to relativistic energies. In this talk, we present estimates of the cosmic rays and
the high-energy radiation produced in such a situation, focusing particularly on bow shocks developed around
fragments of the disk, which are expected to be detectable X-ray sources.