A spectroscopic study of a z=1.6 galaxy overdensity with GMASS
Abstract
The Galaxy Mass Assembly ultra-deep Spectroscopic Survey samples a part of the CDFS to unprecedented depth. The resulting distribution of 150 z>1.4 redshifts reveals a significant peak at z=1.6, part of a larger overdensity found at this redshift. The 42 spectroscopic members of this structure, called Cl 0332-2742, form an overdensity in redshift of a factor 11+/-3 and have a velocity dispersion of 450 km/s. We derive a total mass for Cl 0332-2742 of ~7x10^14 Msol. The colours of its early-type galaxies are consistent with a theoretical red sequence of galaxies with stars formed at z=3.0. In addition, there are more massive, passive and older, but less star forming galaxies in CL 0332-2742 than in the field. We conclude that this structure is a cluster under assembly at z=1.6.
Keywords
Cite
@article{arxiv.0804.4126,
title = {A spectroscopic study of a z=1.6 galaxy overdensity with GMASS},
author = {Jaron Kurk and Andrea Cimatti and Gianni Zamorani and Claire Halliday and Marco Mignoli and Lucia Pozzetti and Emanuele Daddi and Piero Rosati and Marc Dickinson and Micol Bolzonella and Paolo Cassata and Alvio Renzini and Alberto Franceschini and Giulia Rodighiero and Stefano Berta},
journal= {arXiv preprint arXiv:0804.4126},
year = {2008}
}
Comments
4 pages, 1 figure, proceedings of the first Subaru International Conference: "Panoramic Views of Galaxy Formation and Evolution", in Hayama, Japan, December 2007