This article has an erratum: [erratum]
Volume 555, July 2013
|Number of page(s)||13|
|Published online||19 June 2013|
Morphology with light profile fitting of confirmed cluster galaxies at z = 0.84
Departamento de AstronomíaUniversidad de Concepción,
2 GEPI, Paris Observatory, CNRS, University of Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France
3 Australian Astronomical Observatory, PO Box 296, Epping NSW 1710, Australia
4 ESO, Karl-Schwarzchild Strasse 2, 85748 Garching, Germany
5 Department of Physics, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
Received: 8 February 2013
Accepted: 2 May 2013
We perform a morphological study of 124 spectroscopically confirmed cluster galaxies in the redshift (z) = 0.84 galaxy cluster RX J0152.7-1357. Our classification scheme includes color information, visual morphology, and one- and two-component light profile fitting derived from Hubble Space Telescope riz imaging. We adopt a modified version of a detailed classification scheme previously used in studies of field galaxies and found to be correlated with kinematic features of those galaxies. We compare our cluster galaxy morphologies to those of field galaxies at similar redshift. We also compare galaxy morphologies in regions of the cluster with different dark-matter density as determined by weak-lensing maps. We find an early-type fraction for the cluster population as a whole of 47%, about 2.8 times higher than the field, and similar to the dynamically young cluster MS 1054 at similar redshift. We find the most drastic change in morphology distribution between the low and intermediate dark-matter density regions within the cluster, with the early-type fraction doubling and the peculiar fraction dropping by nearly half. The peculiar fraction drops more drastically than the spiral fraction going from the outskirts to the intermediate-density regions. This suggests that many galaxies falling into clusters at z ~ 0.8 may evolve directly from peculiar, merging, and compact systems into early-type galaxies, without having the chance to first evolve into a regular spiral galaxy.
Key words: galaxies: clusters: general / galaxies: clusters: individual: RX J0152.7-1357 / galaxies: evolution
© ESO, 2013
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