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Luminous Compact Blue Galaxies (LCBGs) are an extreme star-burstingpopulation of galaxies that were far more common at earlier epochs than today.Based on spectroscopic and photometric measurements of LCBGs in massive (M>10^15 M_sun), intermediate redshift (0.5 < z < 0.9) galaxy clusters, wepresent their rest-frame properties including star-formation rate, dynamicalmass, size, luminosity, and metallicity. The appearance of these small, compactgalaxies in clusters at intermediate redshift helps explain the observedredshift evolution in the size-luminosity relationship among cluster galaxies.In addition, we find the rest-frame properties of LCBGs appearing in galaxyclusters are indistinguishable from field LCBGs at the same redshift. Up to 35%of the LCBGs show significant discrepancies between optical and infraredindicators of star formation, suggesting that star formation occurs in obscuredregions. Nonetheless, the star formation for LCBGs shows a decrease toward thecenter of the galaxy clusters. Based on their position and velocity, weestimate that up to 10% of cluster LCBGs are likely to merge with anothercluster galaxy. Finally, the observed properties and distributions of the LCBGsin these clusters lead us to conclude that we are witnessing the quenching ofthe progenitors of dwarf elliptical galaxies that dominate the number densityof present-epoch galaxy clusters.

Spectroscopy of Luminous Compact Blue Galaxies in Distant Clusters II. Physical Properties of dE Progenitor Candidates