The SCUBA-2 Cosmology Legacy Survey: the submillimetre properties of Lyman-break galaxies at z=3-5
Journal article, 2015
We present detections at 850 mu m of the Lyman-break galaxy (LBG) population at z approximate to 3, 4, and 5 using data from the Submillimetre Common User Bolometer Array 2 Cosmology Legacy Survey in the United Kingdom Infrared Deep Sky Survey 'Ultra Deep Survey' field. We employ stacking to probe beneath the survey limit, measuring the average 850 mu m flux density of LBGs at z approximate to 3, 4, and 5 with typical ultraviolet luminosities of L-1700 approximate to 10(29) erg s(-1) Hz(-1). We measure 850 mu m flux densities of (0.25 +/- 0.03), (0.41 +/- 0.06), and (0.88 +/- 0.23) mJy, respectively, finding that they contribute at most 20 per cent to the cosmic far-infrared (IR) background at 850 mu m. Fitting an appropriate range of spectral energy distributions to the z similar to 3, 4, and 5 LBG stacked 24-850 mu m fluxes, we derive IR luminosities of L8-1000 (mu m) approximate to 3.2, 5.5, and 11.0 x 10(11) L-circle dot [and star formation rates (SFRs) of approximate to 50-200M(circle dot) yr(-1)], respectively. We find that the evolution in the IR luminosity density of LBGs is broadly consistent with model predictions for the expected contribution of luminous-to-ultraluminous IR galaxies at these epochs. We observe a positive correlation between stellar mass and IR luminosity and confirm that, for a fixed mass, the reddest LBGs (UV slope beta -> 0) are redder due to dust extinction, with SFR (IR)/SFR (UV) increasing by about an order of magnitude over -2 < beta < 0 with SFR (IR)/SFR (UV) similar to 20 for the reddest LBGs. Furthermore, the most massive LBGs tend to have higher obscured-to-unobscured ratios, hinting at a variation in the obscuration properties across the mass range.
Deep Field-South
Ultraviolet-Selected Galaxies
Stellar Masses
Similar-To 3
Luminosity Function
Number Counts
High-Redshift
Extragalactic Survey
Star-Forming Galaxies
Dust Emission
Author
K. E. K. Coppin
University of Hertfordshire
J.E. Geach
University of Hertfordshire
O. Almaini
University of Nottingham
V. Arumugam
University of Edinburgh
European Southern Observatory (ESO)
J.S. Dunlop
University of Edinburgh
W. G. Hartley
Swiss Federal Institute of Technology in Zürich (ETH)
R. J. Ivison
University of Edinburgh
European Southern Observatory (ESO)
C. J. Simpson
Liverpool John Moores University
D. J. B. Smith
University of Hertfordshire
A. M. Swinbank
Durham University
A.W. Blain
University Of Leicester
N. Bourne
University of Edinburgh
M. Bremer
University of Bristol
C. Conselice
University of Nottingham
C. M. Harrison
Durham University
A. Mortlock
University of Edinburgh
S. C. Chapman
Dalhousie University
L. J. M. Davies
University of Western Australia
D. Farrah
Virginia Polytechnic Institute and State University
A. Gibb
University of British Columbia (UBC)
T. Jenness
Cornell University
Joint Astronomy Centre
A. Karim
University of Bonn
Kirsten Kraiberg Knudsen
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
E. Ibar
University of Valparaíso
M. J. Michalowski
University of Edinburgh
J. A. Peacock
University of Edinburgh
D. Rigopoulou
STFC Rutherford Appleton Laboratory
University of Oxford
I. Robson
University of Edinburgh
Royal Observatory
D. Scott
University of British Columbia (UBC)
J. Stevens
University of Hertfordshire
P.P. van der Werf
Leiden University
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 446 2 1293-1304Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.1093/mnras/stu2185