Characterization of Omega-WINGS galaxy clusters. I. Stellar light and mass profiles

Galaxy clustersare the largest virialized structures in the observable Universe. The knowledge of their properties provides many useful astrophysical and cosmological information. Our aim is to derive the luminosityand stellar massprofiles of the nearby galaxy clustersof the Omega-WINGS survey and to study the main scaling relations valid for such systems. We have merged the data of the WINGS and Omega-WINGS databases, sorted the sources according to the distance from the brightest cluster galaxy(BCG) and calculated the integrated luminosityprofiles in the $B$ and $ V$ bands, taking into account extinction, photometric and spatial completeness, K-correctionand background contribution. Then, by exploiting the spectroscopic sample we derived the stellar massprofiles of the clusters. We got the luminosityprofiles of 46 galaxy clusters, reaching $r_{200}$ in 30 cases, and the stellar massprofiles of 42 of our objects. We successfully fitted all the integrated luminositygrowth profiles with one or two embedded S\'ersic components, deriving the main clusters parameters. Finally, we checked the main scaling relation among the clusters parameters in comparison with those obtained for a selected sample of early-type galaxies (ETGs) of the same clusters. We found that the nearby galaxy clustersare non-homologous structures like ETGs and exhibit a color-magnitude (CM) red-sequence relation very similar to that observed for galaxies in clusters. These properties are not expected in the current cluster formation scenarios. In particular the existence of a CM relation for clusters, shown here for the first time, suggests that the baryonic structures grow and evolve in a similar way at all scales.