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To understand the processes that build up galaxies we investigate the stellarstructure and gas kinematics of spiral and irregular galaxies out to redshift1. We target 92 galaxies in four cluster (z = 0.3 & 0.5) fields to study theenvironmental influence. Their stellar masses derived from multiband VLT/FORSphotometry are distributed around but mostly below the characteristicSchechter-fit mass. From HST/ACS images we determine morphologies andstructural parameters like disk length, position angle and ellipticity.Combining the spectra of three slit positions per galaxy using the MXU mode ofVLT/FORS2 we construct the two-dimensional velocity field from gas emissionlines for 16 cluster members and 33 field galaxies. The kinematic positionangle and flatness are derived by a Fourier expansion of elliptical velocityprofiles. To trace possible interaction processes, we define three irregularityindicators based on an identical analysis of local galaxies from the SINGSproject. Our distant sample displays a higher fraction of disturbed velocityfields with varying percentages (10%, 30% and 70%) because they trace differentfeatures. While we find far fewer candidates for major mergers than the SINSsample at z~2, our data are sensitive enough to trace less violent processes.Most irregular signatures are related to star formation events and less massivedisks are affected more than Milky-Way type objects. We detect similarly highfractions of irregular objects both for the distant field and cluster galaxieswith similar distributions. We conclude that we may witness the building-up ofdisk galaxies still at redshifts z~0.5 via minor mergers and gas accretion,while some cluster members may additionally experience stripping, evaporationor harassment interactions.

Kinematic and Structural Evolution of Field and Cluster Spiral Galaxies