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A. M. Koekemoer, C. P. O'Dea, S. A. Baum, J. Mack (STScI)
We present detailed HST/STIS and WFPC2 imaging of extensive Lyman-alpha and continuum emission complexes that are present around radio galaxy hosts in the centers of cooling-flow clusters. The origin and emission mechanisms of this gas is of great interest, as it is a tracer not only of cool gas in these clusters but can also give valuable information about recent star-formation that has been occurring. In some cases the emission also traces interactions between the radio source and surrounding gas, thereby allowing a direct investigation of the effect of the environment upon the evolution of the radio source, together with the overall role played by the radio source in the long-term energetics of the cooling-flow nebula.