Observing ram pressure at work in intermediate redshift clusters with
  MUSE: the case of Abell 2744and Abell 370
  Ram pressure stripping has been proven to be effective in shaping galaxy
properties in dense environments at low redshift. The availability of MUSE
observations of a sample of distant (z$\sim 0.3-0.5$) clusters has allowed to
search for galaxies subject to this phenomenon at significant lookback times.
In this paper we describe how we discovered and characterized 13 ram-pressure
stripped galaxies in the central regions of two intermediate redshift
(z$\sim$0.3-0.4) clusters, A2744 and A370, using the MUSE spectrograph.
Emission line properties as well as stellar features have been analyzed to
infer the presence of this gas--only stripping mechanism, that produces
spectacular ionized gas tails (H$_{\alpha}$ and even more astonishing
[OII](3727,3729) departing from the main galaxy body. The inner regions of
these two clusters reveal the predominance of such galaxies among blue
star-forming cluster members, suggesting that ram-pressure stripping was even
more effective at intermediate redshift than in today's Universe.
Interestingly, the resolved [OII]/H$_{\alpha}$ line ratio in the stripped tails
is exceptionally high compared to that in the disks of these galaxies, (which
is comparable to that in normal low-z galaxies), suggesting lower gas densities
and/or an interaction with the hot surrounding ICM.
