Superdense massive galaxies in the ESO Distant Cluster Survey (EDisCS)
Por:
Valentinuzzi T., Poggianti B.M., Saglia R.P., Aragón-Salamanca A., Simard L., Sánchez-Blázquez P., D'onofrio M., Cava A., Couch W.J., Fritz J., Moretti A., Vulcani B.
Publicada:
1 ene 2010
Resumen:
We find a significant number of massive and compact galaxies in clusters from the ESO Distant Clusters Survey (EDisCS) at 0.4 < z < 1. They have similar stellar masses, ages, sizes, and axial ratios to local z ~ 0.04 compact galaxies in WIde field Nearby Galaxy clusters Survey (WINGS) clusters, and to z = 1.4-2 massive and passive galaxies found in the general field. If non-brightest cluster galaxies of all densities, morphologies, and spectral types are considered, the median size of EDisCS galaxies is only a factor 1.18 smaller than in WINGS. We show that for morphologically selected samples, the morphological evolution taking place in a significant fraction of galaxies during the last Gyr may introduce an apparent, spurious evolution of size with redshift, which is actually due to intrinsic differences in the selected samples. We conclude that the median mass-size relation of cluster galaxies does not evolve significantly from z ~ 0.7 to z ~ 0.04. In contrast, the masses and sizes of BCGs and galaxies with M* > 4 × 1011M? have significantly increased by a factor of 2 and 4, respectively, confirming the results of a number of recent works on the subject. Our findings show that progenitor bias effects play an important role in the size-growth paradigm of massive and passive galaxies. © 2010. The American Astronomical Society. All rights reserved.
Filiaciones:
Valentinuzzi T.:
Astronomical Department, University of Padova, Italy
Poggianti B.M.:
INAF-Astronomical Observatory, Padova, Italy
Saglia R.P.:
Max-Planck Institut für Extraterrestrische Physik, Giessenbachstraße, D-85741 Garching, Germany
Aragón-Salamanca A.:
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
Simard L.:
Herzberg Institute of Astrophysics, National Research Council of Canada, Victoria, BC V9E 2E7, Canada
Sánchez-Blázquez P.:
Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain
Departamento de Astrofisica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
D'onofrio M.:
Astronomical Department, University of Padova, Italy
Cava A.:
Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain
Departamento de Astrofisica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
Couch W.J.:
Center for Astrophysics and Supercomputing, Swinburne University of Technology, Australia
Fritz J.:
INAF-Astronomical Observatory, Padova, Italy
Moretti A.:
INAF-Astronomical Observatory, Padova, Italy
Vulcani B.:
Astronomical Department, University of Padova, Italy
INAF-Astronomical Observatory, Padova, Italy
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