GASP XXXVIII: The LOFAR-MeerKAT-VLA view on the non-thermal side of a
  jellyfish galaxy
  Ram pressure stripping is a crucial evolutionary driver for cluster galaxies.
It is thought to be able to accelerate the evolution of their star formation,
trigger the activity of their central active galactic nucleus (AGN) and the
interplay between the galactic and environmental gas, and eventually dissipate
their gas reservoir. We explored the outcomes of ram pressure stripping by
studying the non-thermal radio emission of the jellyfish galaxy JW100 in the
cluster Abell 2626 ($z=0.055$) by combining LOFAR, MeerKAT, and VLA
observations from 0.144 to 5.5 GHz. We studied the integrated spectra of the
stellar disk, the stripped tail and the AGN, mapped the spectral index over the
galaxy, and constrained the magnetic field intensity to be between 11 and 18
$\mu$G in the disk and $<10$ $\mu$G in the tail. The stellar disk radio
emission is dominated by a radiatively old plasma, likely related to an older
phase of high star formation rate. This suggests that the star formation was
quickly quenched by a factor of 4 in a few $10^7$ yr. The radio emission in the
tail is consistent with the stripping scenario, where the radio plasma
originally accelerated in the disk is then displaced in the tail. The
morphology of the radio and X-ray emissions supports the scenario of accretion
of the magnetized environmental plasma onto the galaxy. The AGN non-thermal
spectrum indicates that the relativistic electron acceleration may have
occurred simultaneously with a central ionized gas outflow, thus suggesting a
physical connection between the two processes.
