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We study the mid-infrared (MIR) properties of galaxies in 30 massive galaxyclusters at 0.02<z<0.40, using panoramic Spitzer/MIPS 24micron and NIR data.This is the largest sample of clusters to date with MIR data covering not onlythe cluster cores, but extending into the infall regions. We revisit theButcher-Oemler effect, measuring the fraction of massive infrared-luminousgalaxies (K<K*+1.5, L_IR>5x10^10L_sun) within r_200, finding a steady increasein the fraction with redshift from ~3% at z=0.02 to ~10% by z=0.30, and an rmscluster-to-cluster scatter about this trend of 0.03. The best-fit redshiftevolution model is of the form f_SF ~ (1+z)^5.7, which is stronger redshiftevolution than that of L*_IR in both clusters and the field. We find that,statistically, this excess is associated with galaxies found at largecluster-centric radii, implying that the MIR Butcher-Oemler effect can beexplained by a combination of both the global decline in star-formation in theuniverse since z~1 and enhanced star formation in the infall regions ofclusters at intermediate redshifts. This picture is supported by a simpleinfall model based on the Millennium Simulation semi-analytic galaxy catalogs,whereby star-formation in infalling galaxies is instantaneously quenched upontheir first passage through the cluster, in that the observed radial trends off_SF trace those inferred from the simulations. We also find that f_SF does notdepend on simple indicators of the dynamical state of clusters, including theoffset between the brightest cluster galaxy and the peak of the X-ray emission.This is consistent with the picture described above in that most newstar-formation in clusters occurs in the infall regions, and is thus notsensitive to the details of cluster-cluster mergers in the core regions.

LoCuSS: The mid-infrared Butcher-Oemler effect