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(Abridged) We trace the interaction processes of galaxies at intermediateredshift by measuring the irregularity of their ionized gas kinematics, andinvestigate these irregularities as a function of the environment (clusterversus field) and of morphological type (spiral versus irregular). Our sampleconsists of 92 distant galaxies. 16 cluster (z~0.3 and z~0.5) and 29 fieldgalaxies (mean z=0.44) of these have velocity fields with sufficient signal tobe analyzed. We find that the fraction of galaxies that have irregular gaskinematics is remarkably similar in galaxy clusters and in the field atintermediate redshifts. The distribution of the field and cluster galaxies in(ir)regularity parameters space is also similar. On the other hand galaxieswith small central concentration of light, that we see in the field sample, areabsent in the cluster sample. We find that field galaxies at intermediateredshifts have more irregular velocity fields as well as more clumpy and lesscentrally concentrated light distributions than their local counterparts.Comparison with a SINS sample of 11 z ~ 2 galaxies shows that these distantgalaxies have more irregular gas kinematics than our intermediate redshiftcluster and field sample. We do not find a dependence of the irregularities ingas kinematics on morphological type. We find that two different indicators ofstar formation correlate with irregularity in the gas kinematics. Moreirregular gas kinematics, also more clumpy and less centrally concentratedlight distributions of spiral field galaxies at intermediate redshifts incomparison to their local counterparts indicate that these galaxies areprobably still in the process of building their disks via mechanisms such asaccretion and mergers. On the other hand, they have less irregular gaskinematics compared to galaxies at z ~ 2.

Internal kinematics of spiral galaxies in distant clusters IV. Gas kinematics of spiral galaxies in intermediate redshift clusters and in the field