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We present the first study of large-scale bars in clusters at intermediateredshifts (z=0.4-0.8). We compare the properties of the bars and their hostgalaxies in the clusters with those of a field sample in the same redshiftrange. We use a sample of 945 moderately inclined disk galaxies drawn from theEDisCS project. The morphological classification of the galaxies and thedetection of bars are based on deep HST/ACS F814W images. The total optical barfraction in the redshift range z=0.4-0.8, averaged over the entire sample, is25%. This is lower than found locally, but in good agreement with studies ofbars in field environments at intermediate redshifts. For the cluster and fieldsubsamples, we measure bar fractions of 24% and 29%, respectively. In agreementwith local studies, we find that disk-dominated galaxies have a higher barfraction than bulge-dominated galaxies. We also find, based on a smallsubsample, that bars in clusters are on average longer than in the field andpreferentially found close to the cluster center, where the bar fraction issomewhat higher than at larger distances.

Bars in field and cluster galaxies at intermediate redshifts