We have observed the environments of a population of 33 heavily dust obscured, ultraluminous, high-redshift galaxies, selected using WISE and NVSS at z >1.3 with the Infra-Red Array Camera on the Spitzer Space Telescope over 5.12 ×5.12 fields. Colour selections are used to quantify any potential overdensities of companion galaxies in these fields. We find no significant excess of galaxies with the standard colour selection for IRAC colours of [3.6] − [4.5] > −0.1 consistent with galaxies at z >1.3 across the whole fields with respect to wide-area Spitzer comparison fields, but there is a > 2σ statistical excess within 0.25 of the central radio-WISE galaxy. Using a colour selection of [3.6] − [4.5] > 0.4, 0.5 magnitudes redder than the standard method of selecting galaxies at z >1.3, we find a significant overdensity, in which 76% (33%) of the 33 fields have a surface density greater than the 3σ (5σ) level. There is a statistical excess of these redder galaxies within 0.5 , rising to a central peak ∼ 2-4 times the average density. This implies that these galaxies are statistically linked to the radio-WISE selected galaxy, indicating similar structures to those traced by red galaxies around radio-loud AGN.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.