Bibcode
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.
Bibliographical reference
The Astrophysical Journal Letters, Volume 721, Issue 1, pp. L19-L23 (2010).
Advertised on:
9
2010
Citations
73
Refereed citations
68
Description
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 ×
1011 M sun 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.
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