Cluster Lensing and the Impact of Cooling Flows

We propose to observe three wellstudied cluster gravitational lenses,which are amongst the most Xray luminous and massive systems known atintermediate redshifts. The observations will permit accuratedeterminations of the Xray gas mass, total mass, baryon and metallicitydistributions in the clusters. The data will reveal the impact of coolingflows on Xray mass measurements and elucidate the origins of thediscrepancies between Xray and strong lensing masses for clusters withoutcooling flows. The data will also provide a crucial step in establishingthe mass/temperature relation for luminous clusters. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]