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The GASP survey, based on MUSE data, is unveiling the properties of the gasin the so-called "jellyfish" galaxies: these are cluster galaxies withspectacular evidence of gas stripping by ram pressure. In a previous paper, weselected the seven GASP galaxies with the most extended tentacles of ionizedgas, and based on individual diagnostic diagrams concluded that at least fiveof them present clear evidence for an Active Galactic Nucleus. Here we presenta more detailed analysis of the emission lines properties in these galaxies.Our comparison of several emission line ratios with both AGN and shock modelsshow that photoionization by the AGN is the dominant ionization mechanism. Thisconclusion is strengthened by the analysis of $\rm H\beta$ luminosities, thepresence of nuclear iron coronal lines and extended ($>10$ kpc) emission lineregions ionized by the AGN in some of these galaxies. From emission lineprofiles, we find the presence of outflows in four galaxies, and derive massoutflow rates, timescales and kinetic energy of the outflows.

GASP XIX: AGN and their outflows at the center of jellyfish galaxies