![]() In face-on cases, gas removed from the outer edges falls to higher orbits, appearing to ‘unwind’.Posters: Because of the large number of contributions, some oral presentations had to be transferred into Posters. We compare the morphology and kinematics with simulated ram-pressure stripping galaxies, taking into account the estimated inclination with respect to the intracluster medium (ICM) and find that in edge-on stripping, unwinding can occur due to differential ram pressure caused by the disc rotation, causing stripped material to slow and ‘pile up’. We find only younger stars in the unwound component, while older stars in the disc remain undisturbed. ![]() We first confirm the unwinding nature, finding that the spiral arm pitch angle increases radially in 10 stripped galaxies and also simulated face-on and edge-on stripped galaxies. Gravitational influence from neighbours is ruled out and we compare the sample with a control group of undisturbed spiral galaxies and simulated stripped galaxies. We study 11 ram-pressure stripped galaxies from GASP (GAs Stripping Phenomena in galaxies) in which, in addition to more commonly observed ‘jellyfish’ features, dislodged material also appears to retain the original structure of the spiral arms. ![]() We present the first study of the effect of ram pressure ‘unwinding’ the spiral arms of cluster galaxies.
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