文章基本信息

标题：Characterization of Omega-WINGS galaxy clusters
其他标题：I. Stellar light and mass profiles
本地全文：下载
作者：S. Cariddi ; M. D’Onofrio ; G. Fasano 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：609
DOI：10.1051/0004-6361/201731605
语种：English
出版社：EDP Sciences
摘要：Context.Galaxy clusters are the largest virialized structures in the observable Universe. Knowledge of their properties provides many useful astrophysical and cosmological information.Aims.Our aim is to derive the luminosity and stellar mass profiles of the nearby galaxy clusters of the Omega-WINGS survey and to study the main scaling relations valid for such systems.Methods.We merged data from the WINGS and Omega-WINGS databases, sorted the sources according to the distance from the brightest cluster galaxy (BCG), and calculated the integrated luminosity profiles in theBandVbands, taking into account extinction, photometric and spatial completeness,Kcorrection, and background contribution. Then, by exploiting the spectroscopic sample we derived the stellar mass profiles of the clusters.Results.We obtained the luminosity profiles of 46 galaxy clusters, reachingr200in 30 cases, and the stellar mass profiles of 42 of our objects. We successfully fitted all the integrated luminosity growth profiles with one or two embedded Sérsic 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.Conclusions.We found that the nearby galaxy clusters are non-homologous structures such as 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.
关键词：engalaxies: clusters: generalgalaxies: fundamental parametersgalaxies: structuregalaxies: elliptical and lenticular, cDgalaxies: photometry