UV and H? HST Observations of Six GASP Jellyfish Galaxies

Abstract Star-forming, H ? -emitting clumps are found embedded in the gaseous tails of galaxies undergoing intense ram pressure stripping galaxy clusters, so-called jellyfish galaxies. These offer a unique opportunity to study star formation under extreme conditions, absence an underlying disk and within hot intracluster medium. Yet, comprehensive, high-spatial-resolution these systems is missing. We obtained UVIS/Hubble Space Telescope (HST) data observe first statistical sample disks six from GASP survey; we used combination broadband (UV I) filters narrowband filter. HST observations needed sizes, stellar masses, ages their clustering hierarchy. will be clump scaling relations universality process, verify whether irrelevant, as hinted at by results This paper presents observations, reduction strategy, some general based on preliminary analysis. The high spatial resolution UVIS gives unprecedentedly sharp view complex structure inner regions substructures disks. clear signatures very close projection galactic disk. star-forming stripped extremely bright compact did not detect significant number where MUSE any. finally development plan for project.