A spectroscopic study of a z=1.6 galaxy overdensity with GMASS

Details A spectroscopic study of a z=1.6 galaxy overdensity with GMASS A spectroscopic study of a z=1.6 galaxy overdensity with GMASS

2008-04-25

arxiv.org/abs/0804.4126v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, proceedings of the first Subaru International Conference: "Panoramic Views of Galaxy Formation and Evolutio

Scientific paper

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.

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