Triplets of Quasars at high redshift I: Photometric data

TL;DR

This study presents optical and infrared imaging data of four quasar triplets, creating a reliable photometric catalog to investigate their environments for galaxy overdensities like groups and clusters.

Contribution

It provides a new, high-quality photometric dataset around high-redshift quasar triplets for large-scale structure analysis.

Findings

Photometric catalog reaches limiting magnitudes suitable for large-scale structure studies.

Photometry is consistent with literature, confirming data reliability.

Enables search for galaxy overdensities near quasar triplets.

Abstract

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.