Kevin M Lacaille
Two sub-millimetre bright protoclusters bounding the epoch of peak star-formation activity
Lacaille, Kevin M; Chapman, Scott C; Smail, Ian; Steidel, CC; Blain, AW; Geach, J; Golob, A; Gurwell, M; Ivison, RJ; Reddy, N; Sawicki, M
Authors
Scott C Chapman
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
CC Steidel
AW Blain
J Geach
A Golob
M Gurwell
RJ Ivison
N Reddy
M Sawicki
Abstract
We present James Clerk Maxwell Telescope Submillimetre Common-User Bolometer Array 2 (SCUBA-2) 850 & 450 μm observations (σ850 ∼ 0.5 mJy, σ450 ∼ 5 mJy) of the HS1549+19 and HS1700+64 survey fields containing two of the largest known galaxy over-densities at z = 2.85 and 2.30, respectively. We detect 56 sub-millimetre galaxies (SMGs) with SNR >4 over ∼50 arcmin2 at 850 μm with flux densities of 3 – 17 mJy. The number counts indicate over-densities in the 3-arcmin diameter core region (∼1.5 Mpc at z = 2.5) of 6+4−2× (HS1549) and 4+6−2× (HS1700) compared to blank field surveys. Within these core regions, we spectroscopically confirm that approximately one third of the SMGs lie at the protocluster redshifts for both HS1549 and HS1700. We use statistical identifications of other SMGs in the wider fields to constrain an additional four candidate protocluster members in each system. We combine multi wavelength estimates of the star-formation rates (SFRs) from Lyman-break dropout- and narrowband-selected galaxies, and the SCUBA-2 SMGs, to estimate total SFRs of 12,500 ± 2800 M⊙ yr−1 (4900 ± 1200 M⊙ yr−1) in HS1549 (HS1700), and SFR densities (SFRDs) within the central 1.5-Mpc diameter of each protocluster to be 3000 ± 900 M⊙ yr−1 Mpc−3 (1300 ± 400 M⊙ yr−1 Mpc−3) in the HS1549 (HS1700) protocluster, ∼104 × larger than the global SFRDs found at their respective epochs, due to the concentration of star-forming galaxies in the small volume of the dense cluster cores. Our results suggest centrally concentrated starbursts within protoclusters may be a relatively common scenario for the build up of mass in rich clusters assembling at z ≳ 2.
Citation
Lacaille, K. M., Chapman, S. C., Smail, I., Steidel, C., Blain, A., Geach, J., …Sawicki, M. (2019). Two sub-millimetre bright protoclusters bounding the epoch of peak star-formation activity. Monthly Notices of the Royal Astronomical Society, 488(2), 1790-1812. https://doi.org/10.1093/mnras/stz1742
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 12, 2019 |
Online Publication Date | Jun 26, 2019 |
Publication Date | Sep 30, 2019 |
Deposit Date | Jul 18, 2019 |
Publicly Available Date | Jul 18, 2019 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 488 |
Issue | 2 |
Pages | 1790-1812 |
DOI | https://doi.org/10.1093/mnras/stz1742 |
Files
Accepted Journal Article
(9.4 Mb)
PDF
Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Published Journal Article
(17.6 Mb)
PDF
You might also like
VLA Legacy Survey of Molecular Gas in Massive Star-forming Galaxies at High Redshift
(2023)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search