A large-scale galaxy structure at z = 2.02 associated with the radio galaxy MRC0156-252
Abstract
We present the spectroscopic confirmation of a structure of galaxies surrounding the radio galaxy MRC0156-252 at z = 2.02. The structure was initially discovered as an overdensity of both near-infrared selected z > 1.6 and mid-infrared selected z > 1.2 galaxy candidates. We used the VLT/FORS2 multi-object spectrograph to target ~80 high-redshift galaxy candidates, and obtain robust spectroscopic redshifts for more than half the targets. The majority of the confirmed sources are star-forming galaxies at z > 1.5. In addition to the radio galaxy, two of its close-by companions (< 6'') also show AGN signatures. Ten sources, including the radio galaxy, lie within |z - 2.020 | < 0.015 (i.e., velocity offsets < 1500 km/s) and within projected 2 Mpc comoving of the radio galaxy. Additional evidence suggests not only that the galaxy structure associated with MRC0156-252 is a forming galaxy cluster but also that this structure is most probably embedded in a larger scale structure.
Keywords
Cite
@article{arxiv.1309.6645,
title = {A large-scale galaxy structure at z = 2.02 associated with the radio galaxy MRC0156-252},
author = {Audrey Galametz and Daniel Stern and Laura Pentericci and Carlos De Breuck and Joel Vernet and Dominika Wylezalek and Rene Fassbender and Nina Hatch and Jaron Kurk and Roderik Overzier and Alessandro Rettura and Nick Seymour},
journal= {arXiv preprint arXiv:1309.6645},
year = {2015}
}
Comments
11 pages, 9 figures, 2 tables, accepted for publication in A&A