THERMAL AND CHEMICAL EVOLUTION OF X-RAY-CLUSTERS OF GALAXIES

The thermal and chemical evolution of X-ray clusters of galaxies is ex plored, pursuing the chemical evolution and gas ejection of member gal axies. We take into account the gas-ejection processes from galaxies t o intracluster space by galactic winds powered by supernovae and ram-p ressure stripping. The main results are as follows: 1) The metal suppl y from elliptical galaxies dominates over that of spirals and there is a possibility that ram pressure stripping had occurred at the same or in an earlier epoch than galactic winds in ellipticals. 2) The iron a bundance of the intracluster medium (ICM) depends strongly on the init ial mass function, but weakly on the star-formation rate of elliptical s, and intermediately on the wind epoch in ellipticals and the cluster richness. 3) The contribution to the ICM from galaxies is much smalle r than that of primordial gas.