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Based on optical and X-ray data for a sample of 34 relaxed rich clusters ofgalaxies with redshifts of 0.1-0.9, we studied relative spatial distributionsof the two major baryon contents, the cluster galaxies and the hot plasmas.Using multi-band photometric data taken with the UH88 telescope, we determinedthe integrated (two dimensional) radial light profiles of member galaxies ineach cluster using two independent approaches, i.e., the background subtractionand the color-magnitude filtering. The ICM mass profile of each cluster in oursample, also integrated in two dimensions, was derived from aspatially-resolved spectral analysis using XMM-Newton and Chandra data. Then,the radially-integrated light profile of each cluster was divided by its ICMmass profile, to obtain a profile of "galaxy light vs. ICM mass ratio". Theratio profiles over the central 0.65 R500 regions were found to steepen fromthe higher- to lower- redshift subsamples, meaning that the galaxies becomemore concentrated in the ICM sphere towards lower redshifts. The evolution isalso seen in galaxy number vs. ICM mass ratio profiles. A range of systematicuncertainties in the galaxy light measurements, as well as manyradius-/redshift- dependent biases to the galaxy vs. ICM profiles have beenassessed, but none of them is significant against the observed evolution.Besides, the galaxy light vs. total mass ratio profiles also exhibit gradualconcentration towards lower redshift. We interpret in the context that thegalaxies, the ICM, and the dark matter components followed a similar spatialdistribution in the early phase (z>0.5), while the galaxies have fallen towardsthe center relative to the others at a later phase.

Probing of the Interactions Between the Hot Plasmas and Galaxies in Clusters from z=0.1 to 0.9