The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450-mu m-selected galaxies and their contribution to the cosmic infrared background
Journal article, 2013
The first deep blank-field 450 mu m map (1 sigma approximate to 1.3 mJy) from the Submillimetre Common-User Bolometer Array-2 SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin(2) of the Cosmological Evolution Survey field, in the footprint of the Hubble Space Telescope (HST) Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey. Using 60 submillimetre galaxies detected at >= 3.75s, we evaluate the number counts of 450-mu m-selected galaxies with flux densities S-450 > 5 mJy. The 8 arcsec JCMT beam and high sensitivity of SCUBA-2 now make it possible to directly resolve a larger fraction of the cosmic infrared background (CIB, peaking at. similar to 200 mu m) into the individual galaxies responsible for its emission than has previously been possible at this wavelength. At S450 > 5 mJy, we resolve (7.4 +/- 0.7) x 10(-2) MJy sr(-1) of the CIB at 450 mu m (equivalent to 16 +/- 7 per cent of the absolute brightness measured by the Cosmic Background Explorer at this wavelength) into point sources. A further similar to 40 per cent of the CIB can be recovered through a statistical stack of 24 mu m emitters in this field, indicating that the majority (approximate to 60 per cent) of the CIB at 450 mu m is emitted by galaxies with S450 > 2 mJy. The average redshift of 450 mu m emitters identified with an optical/near-infrared counterpart is estimated to be
= 1.3, implying that the galaxies in the sample are in the ultraluminous class (LIR approximate to 1.1 x 1012 L approximate to). If the galaxies contributing to the statistical stack lie at similar redshifts, then the majority of the CIB at 450 mu m is emitted by galaxies in the luminous infrared galaxy (LIRG) class with LIR > 3.6 x 1011 L-circle dot.
high-redshift galaxies
submillimetre galaxies
observational cosmology
Author
J.E. Geach
McGill University
E. L. Chapin
European Space Astronomy Centre (ESAC)
Joint Astronomy Centre
University of British Columbia (UBC)
K. E. K. Coppin
McGill University
J.S. Dunlop
University of Edinburgh
M. Halpern
University of British Columbia (UBC)
I. Smail
Durham University
P. van der Werf
Leiden University
S. Serjeant
Open University
D. Farrah
Virginia Polytechnic Institute and State University
I. Roseboom
University of Edinburgh
T. Targett
University of Edinburgh
V. Arumugam
University of Edinburgh
V. Asboth
Joint Astronomy Centre
A. Blain
University Of Leicester
A. Chrysostomou
University of Hertfordshire
Joint Astronomy Centre
C. Clarke
University of Sussex
R. J. Ivison
University of Edinburgh
Royal Observatory
S. L. Jones
University Of Leicester
A. Karim
Durham University
T. Mackenzie
University of British Columbia (UBC)
R. Meijerink
University of Groningen
Leiden University
M. J. Michalowski
University of Edinburgh
D. Scott
University of British Columbia (UBC)
J. M. Simpson
Durham University
A. M. Swinbank
Durham University
D. M. Alexander
Durham University
O. Almaini
University of Nottingham
I. Aretxaga
National Institute of Astrophysics, Optics and Electronics
P. Best
University of Edinburgh
S. C. Chapman
Dalhousie University
D. L. Clements
Imperial College London
C. Conselice
University of Nottingham
A. L. R. Danielson
Durham University
S. Eales
Cardiff University
A. C. Edge
Durham University
A. Gibb
University of British Columbia (UBC)
D. Hughes
National Institute of Astrophysics, Optics and Electronics
T. Jenness
Joint Astronomy Centre
Kirsten Kraiberg Knudsen
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
C. G. Lacey
Durham University
G. Marsden
University of British Columbia (UBC)
R. McMahon
University of Cambridge
S. J. Oliver
University of Sussex
M. J. Page
University College London (UCL)
J. A. Peacock
University of Edinburgh
D. Rigopoulou
University of Oxford
STFC Rutherford Appleton Laboratory
I. Robson
Royal Observatory
M. Spaans
University of Groningen
J. Stevens
University of Hertfordshire
T.M.A. Webb
McGill University
C. Willott
National Research Council Canada
C. D. Wilson
McMaster University
M. Zemcov
California Institute of Technology (Caltech)
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 432 1 53-61Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.1093/mnras/stt352