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An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: number counts of submillimeter galaxies

Stach, Stuart M.; Smail, Ian; Swinbank, A.M.; Simpson, J.M.; Geach, J.E.; An, Fang Xia; Almaini, Omar; Arumugam, Vinodiran; Blain, A.W.; Chapman, S.C.; Chen, Chian-Chou; Conselice, C.J.; Cooke, E.A.; Coppin, K.E.K.; Dunlop, J.S.; Farrah, Duncan; Gullberg, B.; Hartley, W.; Ivison, R.J.; Maltby, D.T.; Michałowski, M.J.; Scott, Douglas; Simpson, Chris; Thomson, A.P.; Wardlow, J.L.; Werf, P. van der

Authors

Stuart M. Stach

Ian Smail

A.M. Swinbank

J.M. Simpson

J.E. Geach

Fang Xia An

Omar Almaini

Vinodiran Arumugam

A.W. Blain

S.C. Chapman

Chian-Chou Chen

C.J. Conselice

E.A. Cooke

K.E.K. Coppin

J.S. Dunlop

Duncan Farrah

B. Gullberg

W. Hartley

R.J. Ivison

D.T. Maltby

M.J. Michałowski

Douglas Scott

Chris Simpson

A.P. Thomson

J.L. Wardlow

P. van der Werf



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 0farcs15–0farcs30 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 gsim 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 (

Journal Article Type Article
Publication Date Jun 25, 2018
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 860
Issue 2
APA6 Citation Stach, S. M., Smail, I., Swinbank, A., Simpson, J., Geach, J., An, F. X., …Werf, P. V. D. (2018). An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: number counts of submillimeter galaxies. Astrophysical Journal, 860(2), doi:10.3847/1538-4357/aac5e5
DOI https://doi.org/10.3847/1538-4357/aac5e5
Keywords galaxies: high-redshift ; galaxies: starburst
Publisher URL http://iopscience.iop.org/article/10.3847/1538-4357/aac5e5/meta
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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