Volume 536, December 2011
|Number of page(s)||17|
|Section||Cosmology (including clusters of galaxies)|
|Published online||05 December 2011|
The red-sequence of 72 WINGS local galaxy clusters
Astronomy DepartmentUniversity of Padova, Vicolo Osservatorio 2, 35122 Padova, Italy
2 INAF – Padova Astronomical Observatory, Vicolo Osservatorio 5, 35122 Padova, Italy
3 INAF – Trieste Astronomical Observatory, via Tiepolo 11, 34131 Trieste, Italy
4 Sterrenkundig Observatorium Vakgroep Fysica en Sterrenkunde Universeit Gent, Gent, Belgium
5 Centro de Estudios de Física del Cosmos de Aragón, Plaza de San Juan 1, 44001 Teruel, Spain
6 Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn 3122, VIC, Australia
7 Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101, USA
8 The Niels Bohr Institute, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
9 Departamento de Astrofisica, Universidad Complutense de Madrid, Spain
Received: 20 June 2011
Accepted: 16 September 2011
We study the color − magnitude red sequence and blue fraction of 72 X-ray selected galaxy clusters at z = 0.04−0.07 from the WINGS survey, searching for correlations between the characteristics of the red sequence (RS) and the environment. We consider the slope and scatter of the red sequence, the number ratio of red luminous-to-faint galaxies, the blue fraction, and the fractions of ellipticals, S0s, and spirals that compose the RS. None of these quantities correlate with the cluster velocity dispersion, X-ray luminosity, number of cluster substructures, BCG prevalence over next brightest galaxies, and the spatial concentration of ellipticals. The properties of the RS, instead, depend strongly on local galaxy density. Higher density regions have a smaller RS scatter, a higher luminous-to-faint ratio, a lower blue fraction, and a lower spiral fraction on the RS. Our results clearly illustrate the prominent effect of the local density in setting the epoch when galaxies become passive and join the red sequence, as opposed to the mass of the galaxy host structure.
Key words: galaxies: clusters: general / galaxies: evolution / galaxies: stellar content / galaxies: elliptical and lenticular, cD / galaxies: fundamental parameters
© ESO, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.