Galaxy Properties in Clusters: Dependence on the Environment and the Cluster Identification Techniques - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




Galaxy Properties in Clusters: Dependence on the Environment and the Cluster Identification Techniques - Astrophysics > Cosmology and Nongalactic Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We investigate the dependence of several galaxy properties on the environmentand cluster identification techniques. We select clusters of galaxies from twocatalogues based on the SDSS: the ROSAT-SDSS Galaxy Cluster Survey, and theMaxBCG Catalogue. Based on a volume limited sample of galaxies drawn from thespectroscopic DR5 SDSS, we constructed sub-samples of clusters of galaxies withmore than ten members. Scaling relations as well as segregation of galaxyproperties as a function of the normalized clustocentric radii are analyzed.The properties of galaxies in clusters are compared with those of fieldgalaxies. Galaxies in X-ray and MaxBCG selected clusters show similarsize-luminosity relations. At equal luminosity, late type galaxies in the fieldhave sizes smaller than cluster galaxies of the same morphological type. TheFaber-Jackson relation for early-type galaxies in clusters is also the same forX-ray selected and MaxBCG clusters. We found clear differences between thedynamical properties of galaxies in clusters, the brightest cluster galaxies$BCG s$ and field galaxies. Using several criteria to classify galaxies intomorphological types, we reproduce the well know morphological segregation. Thecorrelation is up to $r-r {200} \sim 1$. For the whole range of clustocentricdistances, X-ray selected clusters present a higher fraction of early typegalaxies than MaxBCG clusters. We also found that bright galaxiespreferentially inhabit the cluster centers. Median sizes of galaxies, such asthe radius that enclose 50% of petrosian flux $r {50}$, present a behaviourthat also depends on the cluster selection criteria. The resultsare discussedin terms of the different processes that affect the evolution of galaxies indifferent environments.



Autor: V. Coenda, H. Muriel

Fuente: https://arxiv.org/



DESCARGAR PDF




Documentos relacionados