Ryley Hill
High-resolution SMA imaging of bright submillimetre sources from the SCUBA-2 Cosmology Legacy Survey
Hill, Ryley; Chapman, Scott C; Scott, Douglas; Petitpas, Glen; Smail, Ian; Chapin, Edward L; Gurwell, Mark A; Perry, Ryan; Blain, Andrew W; Bremer, Malcolm N; Chen, Chian-Chou; Dunlop, James S; Farrah, Duncan; Fazio, Giovanni G; Geach, James E; Howson, Paul; Ivison, RJ; Lacaille, Kevin; Michałowski, Michał J; Simpson, James M; Swinbank, AM; van der Werf, Paul P; Wilner, David J
Authors
Scott C Chapman
Douglas Scott
Glen Petitpas
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Edward L Chapin
Mark A Gurwell
Ryan Perry
Andrew W Blain
Malcolm N Bremer
Chian-Chou Chen
James S Dunlop
Duncan Farrah
Giovanni G Fazio
James E Geach
Paul Howson
RJ Ivison
Kevin Lacaille
Michał J Michałowski
James M Simpson
AM Swinbank
Paul P van der Werf
David J Wilner
Abstract
We have used the Submillimeter Array (SMA) at 860 µm to observe the brightest sources in the Submillimeter Common User Bolometer Array-2 (SCUBA-2) Cosmology Legacy Survey (S2CLS). The goal of this survey is to exploit the large field of the S2CLS along with the resolution and sensitivity of the SMA to construct a large sample of these rare sources and to study their statistical properties. We have targeted 70 of the brightest single-dish SCUBA-2 850 µm sources down to S850 ≈ 8 mJy, achieving an average synthesized beam of 2.4 arcsec and an average rms of σ860 = 1.5 mJy beam−1 in our primary beam-corrected maps. We searched our SMA maps for 4σ peaks, corresponding to S860 6 mJy sources, and detected 62, galaxies, including three pairs. We include in our study 35 archival observations, bringing our sample size to 105 bright single-dish submillimetre sources with interferometric followup. We compute the cumulative and differential number counts, finding them to overlap with previous single-dish survey number counts within the uncertainties, although our cumulative number count is systematically lower than the parent S2CLS cumulative number count by 14 ± 6 per cent between 11 and 15 mJy. We estimate the probability that a 10 mJy singledish submillimetre source resolves into two or more galaxies with similar flux densities to be less than 15 per cent. Assuming the remaining 85 per cent of the targets are ultraluminous starburst galaxies between z = 2 and 3, we find a likely volume density of 400 M yr−1 sources to be ∼ 3+0.7 −0.6 × 10−7 Mpc−3. We show that the descendants of these galaxies could be 4 × 1011 M local quiescent galaxies, and that about 10 per cent of their total stellar mass would have formed during these short bursts of star formation.
Citation
Hill, R., Chapman, S. C., Scott, D., Petitpas, G., Smail, I., Chapin, E. L., …Wilner, D. J. (2018). High-resolution SMA imaging of bright submillimetre sources from the SCUBA-2 Cosmology Legacy Survey. Monthly Notices of the Royal Astronomical Society, 477(2), 2042-2067. https://doi.org/10.1093/mnras/sty746
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 10, 2018 |
Online Publication Date | Mar 21, 2018 |
Publication Date | Mar 21, 2018 |
Deposit Date | May 31, 2018 |
Publicly Available Date | May 31, 2018 |
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 | 477 |
Issue | 2 |
Pages | 2042-2067 |
DOI | https://doi.org/10.1093/mnras/sty746 |
Public URL | https://durham-repository.worktribe.com/output/1329761 |
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© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/about_us/legal/notices)
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