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We have investigated the baryon-mass content in a subsample of 19 clusters ofgalaxies extracted from the X-ray flux-limited sample HIFLUGCS according totheir positions in the sky. For these clusters, we measured total masses andcharacteristic radii on the basis of a rich optical spectroscopic data set, thephysical properties of the intracluster medium (ICM) using XMM-Newton and ROSATX-ray data, and total (galaxy) stellar masses utilizing the SDSS DR7 multi-bandimaging. The observed (hot) gas-mass fractions are almost constant in this massrange. We confirm that the stellar mass fraction decreases as the total massincreases and shows (20+/-4)% scatter; in addition, we show that it decreasesas the central entropy increases. The latter behavior supports a twofoldinterpretation where heating from merging quenches the star-formation activityof galaxies in massive systems, and feedback from supernovae and/or radiogalaxies drives a significant amount of gas to the regions beyond r_{500} or,alternatively, a substantially large amount of intracluster light (ICL) isassociated with galaxies in nonrelaxed systems. Furthermore, less massiveclusters are confirmed to host less gas per unit total mass; however, theyexhibit higher mass fractions in metals, so that their ICM is more metal-rich.This again supports the interpretation that in the potential wells of low-masssystems the star-formation efficiency of galaxies was high or, alternatively,some gas is missing from the hot phase of the ICM. The former hypothesis ispreferred as the main driver of the mass-dependent metal enrichment since thetotal mass-to-optical luminosity ratio increases as the total mass increases.

Star-formation efficiency and metal enrichment of the intracluster medium in local massive clusters of galaxies