Astronomy and Astrophysics – Astronomy
Scientific paper
May 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012mnras.422..719r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 422, Issue 1, pp. 719-730.
Astronomy and Astrophysics
Astronomy
Galaxies: Clusters: General, Galaxies: Clusters: Individual: Lcdcs-S001, Galaxies: High-Redshift
Scientific paper
We present photometric parameters of the galaxies in the direction of the galaxy cluster LCDCS-S001 and improved kinematic parameters from new spectroscopic observations. From GMOS multi-object spectroscopy, we have been able to confirm a new set of 10 cluster members, resulting in a total 22 objects from previous observations. With these data, a dispersion velocity of σ= 887 ± 249 km s-1, a virial radius R200= 0.98 ± 0.22 Mpc and a mass of M200= (5.4 ± 2.8) × 1014 M&sun; have been derived. From GMOS i' and r' images, we have extracted the individual sources and derived their magnitudes, relative positions and the bulge+disc brightness profile decomposition. We show that the cluster has an elongated morphology along the north-south direction, with ellipticity ɛ= 0.49 ± 0.14, well represented by a King model with a core radius RC= 283 ± 66 kpc, above the typical core radii of regular clusters. It shows at least one local overdensity, north-west from the cluster centre, very compact and with a very high central density. The i' luminosity function of LCDCS-S001 has an almost flat faint-end, α=-1.16 ± 0.18. As for the constituent galaxies, we have found that a large fraction of the cluster galaxies are late-type systems. Extensive simulations were made in order to verify the validity of our conclusions. We discuss the implication of these results for the evolutionary status of LCDCS-S001 and conclude that this cluster is still dynamically young.
Pastoriza Miriani Griselda
Rembold Sandro B.
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