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The pressure exerted by the ambient hot X-ray gas on cluster galaxies canlead to the presence of ram pressure stripped (RPS) galaxies, characterized byasymmetric shapes, and, in some cases, tails of blue stars and/or X-ray gas,with increased star formation. We searched for such galaxies in the cluster MS0451.6-0305 at z~0.5, based on Hubble Space Telescope (HST) imaging covering aregion of about 6x6 Mpc^2, an eight magnitude ground-based catalogue withphotometric redshifts, and a spectroscopic redshift catalogue. We defined ascluster members a spectroscopic redshift sample of 359 galaxies within 4sigma_vof the mean cluster velocity, and a photometric redshift sample covering the[0.48,0.61] range. We searched for RPS galaxies and tested the error on theirclassification with a Zooniverse collaboration, and computed the phase spacediagram for the spectroscopic sample. We ran the LePhare stellar populationsynthesis code to analyze and compare the properties of RPS and non-RPSgalaxies. We find 56 and 273 RPS candidates in the spectroscopic andphotometric redshift samples, respectively, distributed throughout the clusterand tending to avoid high density regions. The phase space diagram gives thepercentages of virialized, backsplash, and infall galaxies. RPS galaxycandidates typically show rather high star formation rates, young ages, andrelatively low masses. This study confirms that RPS galaxies host, on average,younger stellar populations and strongly form stars when compared with non-RPScounterparts. The fact that RPS candidates with spectroscopic and withphotometric redshifts have comparable properties shows that large samples ofsuch objects could be gathered based on multi-band photometry only, a promisingresult in view of future very large imaging surveys.

Ram pressure stripping in the z~0.5 galaxy cluster MS 0451.6-0305