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

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

doi:10.3847/1538-4357/aac5e5

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

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. MaltbyM. J. Michałowski, Douglas Scott, Chris Simpson, A. P. Thomson, J. L. Wardlow, P. Van Der Werf

School of Physics and Astronomy

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Abstract / Description of output

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 % 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 _o), 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 (<1% probability of occurring by chance), suggesting that at least 30% of these blends arise from physically associated pairs of SMGs.

Original language	English
Article number	161
Journal	Astrophysical Journal
Volume	860
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aac5e5
Publication status	Published - 25 Jun 2018

Keywords / Materials (for Non-textual outputs)

galaxies: high-redshift
galaxies: starburst

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10.3847/1538-4357/aac5e5

Stach_2018_ApJ_860_161Final published version, 1.06 MB

https://arxiv.org/abs/1805.05362

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Stach, S. M., Smail, I., Swinbank, A. M., Simpson, J. M., Geach, J. E., An, F. X., Almaini, O., Arumugam, V., Blain, A. W., Chapman, S. C., Chen, C. C., Conselice, C. J., Cooke, E. A., Coppin, K. E. K., Dunlop, J. S., Farrah, D., Gullberg, B., Hartley, W., Ivison, R. J., ... 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), Article 161. https://doi.org/10.3847/1538-4357/aac5e5

@article{96d7b759d01b4a38932c84750cde2df5,

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

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 % 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 o), 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 (<1% probability of occurring by chance), suggesting that at least 30% of these blends arise from physically associated pairs of SMGs.",

keywords = "galaxies: high-redshift, galaxies: starburst",

author = "Stach, {Stuart M.} and Ian Smail and Swinbank, {A. M.} and Simpson, {J. M.} and Geach, {J. E.} and An, {Fang Xia} and Omar Almaini and Vinodiran Arumugam 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 Duncan Farrah and B. Gullberg and W. Hartley and Ivison, {R. J.} and Maltby, {D. T.} and Micha{\l}owski, {M. J.} and Douglas Scott and Chris Simpson and Thomson, {A. P.} and Wardlow, {J. L.} and Werf, {P. Van Der}",

year = "2018",

month = jun,

day = "25",

doi = "10.3847/1538-4357/aac5e5",

language = "English",

volume = "860",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

number = "2",

}

Stach, SM, Smail, I, Swinbank, AM, Simpson, JM, Geach, JE, An, FX, Almaini, O, Arumugam, V, Blain, AW, Chapman, SC, Chen, CC, Conselice, CJ, Cooke, EA, Coppin, KEK, Dunlop, JS, Farrah, D, Gullberg, B, Hartley, W, Ivison, RJ, Maltby, DT, Michałowski, MJ, Scott, D, Simpson, C, Thomson, AP, Wardlow, JL & Werf, PVD 2018, 'An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Number Counts of Submillimeter Galaxies', Astrophysical Journal, vol. 860, no. 2, 161. https://doi.org/10.3847/1538-4357/aac5e5

TY - JOUR

T1 - An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field

T2 - Number Counts of Submillimeter Galaxies

AU - Stach, Stuart M.

AU - Smail, Ian

AU - Swinbank, A. M.

AU - Simpson, J. M.

AU - Geach, J. E.

AU - An, Fang Xia

AU - Almaini, Omar

AU - Arumugam, Vinodiran

AU - Blain, A. W.

AU - Chapman, S. C.

AU - Chen, Chian Chou

AU - Conselice, C. J.

AU - Cooke, E. A.

AU - Coppin, K. E.K.

AU - Dunlop, J. S.

AU - Farrah, Duncan

AU - Gullberg, B.

AU - Hartley, W.

AU - Ivison, R. J.

AU - Maltby, D. T.

AU - Michałowski, M. J.

AU - Scott, Douglas

AU - Simpson, Chris

AU - Thomson, A. P.

AU - Wardlow, J. L.

AU - Werf, P. Van Der

PY - 2018/6/25

Y1 - 2018/6/25

N2 - 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 % 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 o), 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 (<1% probability of occurring by chance), suggesting that at least 30% of these blends arise from physically associated pairs of SMGs.

AB - 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 % 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 o), 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 (<1% probability of occurring by chance), suggesting that at least 30% of these blends arise from physically associated pairs of SMGs.

KW - galaxies: high-redshift

KW - galaxies: starburst

UR - http://www.scopus.com/inward/record.url?scp=85049195000&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aac5e5

DO - 10.3847/1538-4357/aac5e5

M3 - Article

AN - SCOPUS:85049195000

SN - 0004-637X

VL - 860

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 161

ER -

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

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