An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field:Number Counts of Submillimeter Galaxies

Stach, Stuart M. and Smail, Ian and Swinbank, A. M. and Simpson, J. M. and Geach, J. E. and An, Fang Xia and Almaini, Omar and Arumugam, Vinodiran and Blain, A. W. and Chapman, S. C. and Chen, Chian-Chou and Conselice, C. J. and Cooke, E. A. and Coppin, K. E. K. and Dunlop, J. S. and Farrah, Duncan and Gullberg, B. and Hartley, W. and Ivison, R. J. and Maltby, D. T. and Michałowski, M. J. and Scott, Douglas and Simpson, Chris and Thomson, A. P. and Wardlow, J. L. and van der Werf, P. (2018) An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field:Number Counts of Submillimeter Galaxies. The Astrophysical Journal, 860 (2). ISSN 0004-637X

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Abstract

We report the first results of AS2UDS, an 870 μm continuum survey with the Atacama Large Millimeter/Submillimeter Array (ALMA) of a total area of ˜50 arcmin2 comprising a complete sample of 716 submillimeter sources drawn from the SCUBA-2 Cosmology Legacy Survey (S2CLS) map of the UKIDSS/UDS field. The S2CLS parent sample covers a 0.96 degree2 field at σ 850 = 0.90 ± 0.05 mJy beam-1. Our deep, high-resolution ALMA observations with σ 870 ˜ 0.25 mJy and a 0.″15-0.″30 FWHM synthesized beam, provide precise locations for 695 submillimeter galaxies (SMGs) responsible for the submillimeter emission corresponding to 606 sources in the low-resolution, single-dish map. We measure the number counts of SMGs brighter than S 870 ≥ 4 mJy, free from the effects of blending and show that the normalization of the counts falls by 28% ± 2% in comparison with the SCUBA-2 published counts, but that the shape remains unchanged. We determine that {44}-14+16% of the brighter single-dish sources with S 850 ≥ 9 mJy consist of a blend of two or more ALMA-detectable SMGs brighter than S 870 ˜ 1 mJy (corresponding to a galaxy with a total-infrared luminosity of L IR ≳ 1012 L ⊙), in comparison with 28% ± 2% for the single-dish sources at S 850 ≥ 5 mJy. Using the 46 single-dish submillimeter sources that contain two or more ALMA-detected SMGs with photometric redshifts, we show that there is a significant statistical excess of pairs of SMGs with similar redshifts (

Item Type:
Journal Article
Journal or Publication Title:
The Astrophysical Journal
Additional Information:
© 2018. The American Astronomical Society. All rights reserved. Author was employed at another UK HEI at the time of submission and was deposited at Durham University Repository, see link http://dro.dur.ac.uk/25522/
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
128208
Deposited By:
Deposited On:
19 Oct 2018 09:36
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Sep 2020 05:29