University of Leicester
Browse

Overdensity of Lyman-break galaxy candidates around hot-dust-obscured galaxies

Download (12.29 MB)
journal contribution
posted on 2025-04-03, 09:26 authored by Dejene Zewdie, Roberto J Assef, Trystan Lambert, Chiara Mazzucchelli, S Ilani Loubser, Manuel Aravena, Jorge González-López, Hyunsung D Jun, Chao-Wei Tsai, Daniel Stern, Guodong Li, Román Fernández Aranda, Tanio Díaz-Santos, Peter RM Eisenhardt, Andrey Vayner, Lee R Martin, Andrew BlainAndrew Blain, Jingwen Wu
Hot dust-obscured galaxies (hot DOGs) are a family of hyper-luminous, heavily obscured quasars. A number of studies based on the identification of companions at optical to far-infrared (FIR) wavelengths have shown that these objects reside in significantly overdense regions of the Universe. Here we present further characterisation of their environments by studying the surface density of Lyman break galaxy (LBG) candidates in the vicinity of three hot DOGs. For two of them, WISE J041010.60–091305.2 (W0410–0913) at z = 3.631 and WISE J083153.25+014010.8 (W0831+0140) at z = 3.912, we identify the candidate LBG companions using deep observations obtained with Baade/IMACS. For the third, WISE J224607.56–052634.9 (W2246–0526) at z = 4.601, we reanalyse previously published data obtained with Gemini-S/GMOS-S. We optimise the LBG photometric selection criteria at the redshift of each target using the COSMOS2020 catalog. When comparing the density of LBG candidates found in the vicinity of these hot DOGs with that in the COSMOS2020 catalog, we find overdensities of δ = 1.83 ± 0.08 (δ′ = 7.49 ± 0.68), δ = 4.67 ± 0.21 (δ′ = 29.17 ± 2.21), and δ = 2.36 ± 0.25 (δ′ = 11.60 ± 1.96) around W0410–0913, W0831+0140, and W2246–0526, respectively, without (with) contamination correction. Additionally, we find that the overdensities are centrally concentrated around each hot DOG. Our analysis also reveals that the overdensity of the fields surrounding W0410–0913 and W0831+0140 declines steeply beyond physical scales of ∼2 Mpc. If these overdensities evolve into clusters by z = 0, the present results suggest that the hot DOG may correspond to the early formation stages of the brightest cluster galaxy. We were unable to determine whether or not this is also the case for W2246–0526 due to the smaller field of view (FOV) of the GMOS-S observations. Our results imply that hot DOGs may be excellent tracers of protoclusters.

History

Author affiliation

College of Science & Engineering Physics & Astronomy

Version

  • VoR (Version of Record)

Published in

Astronomy & Astrophysics

Volume

694

Pagination

A121 - A121

Publisher

EDP Sciences

issn

0004-6361

eissn

1432-0746

Copyright date

2025

Available date

2025-04-03

Language

en

Deposited by

Professor Andrew Blain

Deposit date

2025-03-19

Usage metrics

    University of Leicester Publications

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC