Triplets of Quasars at high redshift I: Photometric data

Details Triplets of Quasars at high redshift I: Photometric data Triplets of Quasars at high redshift I: Photometric data

2008-01-26

arxiv.org/abs/0801.4091v1

Astronomy and Astrophysics

Astrophysics

The paper contains 12 figures and 3 tables

Scientific paper

10.1111/j.1365-2966.2008.13004.x

We have conducted an optical and infrared imaging in the neighbourhoods of 4 triplets of quasars. R, z', J and Ks images were obtained with MOSAIC II and ISPI at Cerro Tololo Interamerican Observatory. Accurate relative photometry and astrometry were obtained from these images for subsequent use in deriving photometric redshifts. We analyzed the homogeneity and depth of the photometric catalog by comparing with results coming from the literature. The good agreement shows that our magnitudes are reliable to study large scale structure reaching limiting magnitudes of R = 24.5, z' = 22.5, J = 20.5 and Ks = 19.0. With this catalog we can study the neighbourhoods of the triplets of quasars searching for galaxy overdensities such as groups and galaxy clusters.

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