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We attempt to determine the dominant processes acting on star-forming diskgalaxies as a result of the cluster environment by studying the normalisedrates and radial distributions of star formation in galaxies withinlow-redshift clusters. We develop indicators of different processes based onthe radial concentrations of R-band and H alpha light within each of thegalaxies studied. The tests are applied to galaxies in each of 3 environments -cluster, supercluster (outside the cluster virial radius) and field. We developnew diagnostic diagrams combining star-formation rate and spatial distributioninformation to differentiate between stripping of outer disk gas, general gasdepletion, nuclear starbursts and galaxy-wide enhancement of star formation.Hubble type classifications of cluster galaxies are found to correlate onlyweakly with their concentration indices, whereas this correlation is strong fornon-cluster populations of disk galaxies. We identify a population ofearly-type disk galaxies in the cluster population with both enhanced andcentrally-concentrated star formation compared to their field counterparts. Theenhanced cluster galaxies frequently show evidence of disturbance. A small butnon-negligible population of cluster galaxies with truncation of star formationin their outer disks is also found.

Star-forming galaxies in low-redshift clusters: Effects of environment on the concentration of star formation