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We report the results of a search for X-ray emission from quasar hostclusters at moderate redshift using the {\sl ROSAT} HRI. We detect no emissionfrom the host clusters of 3C~263 (z=0.646) and PKS~2352-34 (z=0.706) to3$\sigma$\ limits of 3.26 and 2.86 $\times$10$^{44}$\ ergs~s$^{-1}$respectively (H$_o$=50, q$_o$=1/2) for clusters with r$_{core}$=125~kpc andT=5~keV. These limits show that these quasar host clusters are notsubstantially more X-ray luminous than optically or X-ray selected clusters ofsimilar richnesses at z$\gtrsim$0.5. We also report the possible detection of aclump of X-ray emitting gas coincident with the brightest radio lobe of 3C~263.This may be evidence for the existence of a clumpy ICM in the host cluster of3C~263.

A ROSAT Search for X-Ray Emission from Quasar Host Clusters