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Jellyfish are cluster galaxies that experience strong ram-pressure effectsthat strip their gas. Their H$\alpha$ images reveal ionized gas tails up to 100kpc, which could be hosting ongoing star formation. Here we report theultraviolet (UV) imaging observation of the jellyfish galaxy JO201 obtained ata spatial resolution $\sim$ 1.3 kpc. The intense burst of star formationhappening in the tentacles is the focus of the present study. JO201 is the"UV-brightest cluster galaxy" in Abell 85 ($z \sim$ 0.056) with knots andstreams of star formation in the ultraviolet. We identify star forming knotsboth in the stripped gas and in the galaxy disk and compare the UV featureswith the ones traced by H$\alpha$ emission. Overall, the two emissionsremarkably correlate, both in the main body and along the tentacles. Similarly,also the star formation rates of individual knots derived from theextinction-corrected FUV emission agree with those derived from the H$\alpha$emission and range from $\sim$ 0.01 -to- 2.07 $M_{\odot} \, yr^{-1}$. Theintegrated star formation rate from FUV flux is $\sim$ 15 $M_{\odot} \,yr^{-1}$. The unprecedented deep UV imaging study of the jellyfish galaxy JO201shows clear signs of extraplanar star-formation activity due to arecent/ongoing gas stripping event.

monthly notices of the royal astronomical society

Ultra-Violet Imaging Telescope view of ram-pressure stripping in action:  Star formation in the stripped gas of the GASP jellyfish galaxy JO201 in  Abell 85