Abstract
We present the results of ROSAT PSPC and HRI observations of two distant clusters, MS0735+74 and MS0451−03, selected from a sample of serendipitous X‐ray sources. MS0735+74 at z=0216 is a cooling flow candidate because it has extended Hα emission in the central brightest galaxy. MS) 451−03, at z=0.55, is the most luminous cluster in the Extended Medium Sensitivity Survey with Lx≳1045 ergs −1. We have been able to place significant limits on Tx, core radii and the β parameter, and cooling flow contributions. Our preliminary results show that ‘‘cooling flows’’ can be identified by their extended Hα emission. Distant clusters probably do not have more intrinsic absorption than nearby clusters. More tentatively, luminous clusters at high redshift may be cooler and may have somewhat lower Mgas/Mtotal (at 1 Mpc scales) than the clusters of comparable luminosity at low redshift.
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