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In order to assess whether the environment has a significant effect on galaxysizes, we compare the mass--size relations of cluster and field galaxies in the$0.4 < z < 0.8$ redshift range from the ESO Distant Cluster Survey (EDisCS)using HST images. We analyse two mass-selected samples, one defined usingphotometric redshifts ($10.2 \le \log M_\ast/M_{\odot} \le 12.0$), and asmaller more robust subsample using spectroscopic redshifts ($10.6 \le \logM_\ast/M_{\odot} \le 11.8$). We find no significant difference in the sizedistributions of cluster and field galaxies of a given morphology. Similarly,we find no significant difference in the size distributions of cluster andfield galaxies of similar rest-frame $B-V$ colours. We rule out average sizedifferences larger than $10$--$20$\% in both cases. Consistent conclusions arefound with the spectroscopic and photometric samples. These results haveimportant consequences for the physical process(es) responsible for the sizeevolution of galaxies, and in particular the effect of the environment. Theremarkable growth in galaxy size observed from $z\sim2.5$ has been reported todepend on the environment at higher redshifts ($z>1$), with early-type/passivegalaxies in higher density environments growing earlier. Such dependencedisappears at lower redshifts. Therefore, if the reported difference athigher-$z$ is real, the growth of field galaxies has caught up with that ofcluster galaxies by $z\sim1$. Any putative mechanism responsible for galaxygrowth has to account for the existence of environmental differences at highredshift and their absence (or weakening) at lower redshifts.

Galaxy sizes as a function of environment at intermediate redshift from the ESO Distant Cluster Survey