The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence'

M.~P. Koprowski; J.~S. Dunlop; M.~J. Michalowski; I. Roseboom; J.~E. Geach; M. Cirasuolo; I. Aretxaga; R.~A.~A. Bowler; M. Banerji; N. Bourne; K.~E.~K. Coppin; S. Chapman; D.~H. Hughes; T. Jenness; R.~J. McLure; M. Symeonidis; P.~v.~d. Werf

doi:10.1093/mnras/stw564

The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence'

M.~P. Koprowski, J.~S. Dunlop, M.~J. Michalowski, I. Roseboom, J.~E. Geach, M. Cirasuolo, I. Aretxaga, R.~A.~A. Bowler, M. Banerji, N. Bourne, K.~E.~K. Coppin, S. Chapman, D.~H. Hughes, T. Jenness, R.~J. McLure, M. Symeonidis, P.~v.~d. Werf

Centre for Astrophysics Research (CAR)

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Abstract

We investigate the properties of the galaxies selected from the deepest 850-μm survey undertaken to date with (Submillimetre Common-User Bolometer Array 2) SCUBA-2 on the James Clerk Maxwell Telescope as part of the SCUBA-2 Cosmology Legacy Survey. A total of 106 sources (>5σ) were uncovered at 850 μm from an area of ≃150 arcmin2 in the centre of the COSMOS/UltraVISTA/Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field, imaged to a typical depth of σ850 ≃ 0.25 mJy. We utilize the available multifrequency data to identify galaxy counterparts for 80 of these sources (75 per cent), and to establish the complete redshift distribution for this sample, yielding z¯=2.38±0.09z¯=2.38±0.09. We have also been able to determine the stellar masses of the majority of the galaxy identifications, enabling us to explore their location on the star formation rate:stellar mass (SFR:M*) plane. Crucially, our new deep 850-μm-selected sample reaches flux densities equivalent to SFR ≃ 100 M⊙ yr−1, enabling us to confirm that sub-mm galaxies form the high-mass end of the ‘main sequence’ (MS) of star-forming galaxies at z > 1.5 (with a mean specific SFR of sSFR = 2.25 ± 0.19 Gyr−1 at z ≃ 2.5). Our results are consistent with no significant flattening of the MS towards high masses at these redshifts. However, our results add to the growing evidence that average sSFR rises only slowly at high redshift, resulting in log10sSFR being an apparently simple linear function of the age of the Universe.

Original language	English
Pages (from-to)	4321-4344
Number of pages	24
Journal	Monthly Notices of the Royal Astronomical Society
Volume	458
Issue number	4
Early online date	10 Mar 2016
DOIs	https://doi.org/10.1093/mnras/stw564
Publication status	Published - 1 Jun 2016

Keywords

galaxies: evolution, galaxies: high-redshift, galaxies: starburst, cosmology: observations, submillimetre: galaxies

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10.1093/mnras/stw564

MNRAS-2016-Koprowski-4321-44Final published version, 2.39 MB

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Koprowski, M. P., Dunlop, J. S., Michalowski, M. J., Roseboom, I., Geach, J. E., Cirasuolo, M., Aretxaga, I., Bowler, R. A. A., Banerji, M., Bourne, N., Coppin, K. E. K., Chapman, S., Hughes, D. H., Jenness, T., McLure, R. J., Symeonidis, M., & Werf, P. . . (2016). The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence'. Monthly Notices of the Royal Astronomical Society, 458(4), 4321-4344. https://doi.org/10.1093/mnras/stw564

@article{0e9b565d6932468cabaa2774c0c0081c,

title = "The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence'",

abstract = "We investigate the properties of the galaxies selected from the deepest 850-μm survey undertaken to date with (Submillimetre Common-User Bolometer Array 2) SCUBA-2 on the James Clerk Maxwell Telescope as part of the SCUBA-2 Cosmology Legacy Survey. A total of 106 sources (>5σ) were uncovered at 850 μm from an area of ≃150 arcmin2 in the centre of the COSMOS/UltraVISTA/Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field, imaged to a typical depth of σ850 ≃ 0.25 mJy. We utilize the available multifrequency data to identify galaxy counterparts for 80 of these sources (75 per cent), and to establish the complete redshift distribution for this sample, yielding z¯=2.38±0.09z¯=2.38±0.09. We have also been able to determine the stellar masses of the majority of the galaxy identifications, enabling us to explore their location on the star formation rate:stellar mass (SFR:M*) plane. Crucially, our new deep 850-μm-selected sample reaches flux densities equivalent to SFR ≃ 100 M⊙ yr−1, enabling us to confirm that sub-mm galaxies form the high-mass end of the {\textquoteleft}main sequence{\textquoteright} (MS) of star-forming galaxies at z > 1.5 (with a mean specific SFR of sSFR = 2.25 ± 0.19 Gyr−1 at z ≃ 2.5). Our results are consistent with no significant flattening of the MS towards high masses at these redshifts. However, our results add to the growing evidence that average sSFR rises only slowly at high redshift, resulting in log10sSFR being an apparently simple linear function of the age of the Universe.",

keywords = "galaxies: evolution, galaxies: high-redshift, galaxies: starburst, cosmology: observations, submillimetre: galaxies",

author = "M.~P. Koprowski and J.~S. Dunlop and M.~J. Michalowski and I. Roseboom and J.~E. Geach and M. Cirasuolo and I. Aretxaga and R.~A.~A. Bowler and M. Banerji and N. Bourne and K.~E.~K. Coppin and S. Chapman and D.~H. Hughes and T. Jenness and R.~J. McLure and M. Symeonidis and P.~v.~d. Werf",

note = "The final, definitive version of this paper has been published in Monthly Notices of the Royal Astronomical Society, Vol. 458 ( 4 ): 4321-4344, March 2016, DOI: 10.1093/mnras/stw564, first published on line March 10, 2016, by Oxford University Press on behalf of MNRAS. ",

year = "2016",

month = jun,

day = "1",

doi = "10.1093/mnras/stw564",

language = "English",

volume = "458",

pages = "4321--4344",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press (OUP)",

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Koprowski, MP, Dunlop, JS, Michalowski, MJ, Roseboom, I, Geach, JE, Cirasuolo, M, Aretxaga, I, Bowler, RAA, Banerji, M, Bourne, N, Coppin, KEK, Chapman, S, Hughes, DH, Jenness, T, McLure, RJ, Symeonidis, M & Werf, P 2016, 'The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence'', Monthly Notices of the Royal Astronomical Society, vol. 458, no. 4, pp. 4321-4344. https://doi.org/10.1093/mnras/stw564

TY - JOUR

T1 - The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence'

AU - Koprowski, M.~P.

AU - Dunlop, J.~S.

AU - Michalowski, M.~J.

AU - Roseboom, I.

AU - Geach, J.~E.

AU - Cirasuolo, M.

AU - Aretxaga, I.

AU - Bowler, R.~A.~A.

AU - Banerji, M.

AU - Bourne, N.

AU - Coppin, K.~E.~K.

AU - Chapman, S.

AU - Hughes, D.~H.

AU - Jenness, T.

AU - McLure, R.~J.

AU - Symeonidis, M.

AU - Werf, P.~v.~d.

N1 - The final, definitive version of this paper has been published in Monthly Notices of the Royal Astronomical Society, Vol. 458 ( 4 ): 4321-4344, March 2016, DOI: 10.1093/mnras/stw564, first published on line March 10, 2016, by Oxford University Press on behalf of MNRAS.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - We investigate the properties of the galaxies selected from the deepest 850-μm survey undertaken to date with (Submillimetre Common-User Bolometer Array 2) SCUBA-2 on the James Clerk Maxwell Telescope as part of the SCUBA-2 Cosmology Legacy Survey. A total of 106 sources (>5σ) were uncovered at 850 μm from an area of ≃150 arcmin2 in the centre of the COSMOS/UltraVISTA/Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field, imaged to a typical depth of σ850 ≃ 0.25 mJy. We utilize the available multifrequency data to identify galaxy counterparts for 80 of these sources (75 per cent), and to establish the complete redshift distribution for this sample, yielding z¯=2.38±0.09z¯=2.38±0.09. We have also been able to determine the stellar masses of the majority of the galaxy identifications, enabling us to explore their location on the star formation rate:stellar mass (SFR:M*) plane. Crucially, our new deep 850-μm-selected sample reaches flux densities equivalent to SFR ≃ 100 M⊙ yr−1, enabling us to confirm that sub-mm galaxies form the high-mass end of the ‘main sequence’ (MS) of star-forming galaxies at z > 1.5 (with a mean specific SFR of sSFR = 2.25 ± 0.19 Gyr−1 at z ≃ 2.5). Our results are consistent with no significant flattening of the MS towards high masses at these redshifts. However, our results add to the growing evidence that average sSFR rises only slowly at high redshift, resulting in log10sSFR being an apparently simple linear function of the age of the Universe.

AB - We investigate the properties of the galaxies selected from the deepest 850-μm survey undertaken to date with (Submillimetre Common-User Bolometer Array 2) SCUBA-2 on the James Clerk Maxwell Telescope as part of the SCUBA-2 Cosmology Legacy Survey. A total of 106 sources (>5σ) were uncovered at 850 μm from an area of ≃150 arcmin2 in the centre of the COSMOS/UltraVISTA/Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field, imaged to a typical depth of σ850 ≃ 0.25 mJy. We utilize the available multifrequency data to identify galaxy counterparts for 80 of these sources (75 per cent), and to establish the complete redshift distribution for this sample, yielding z¯=2.38±0.09z¯=2.38±0.09. We have also been able to determine the stellar masses of the majority of the galaxy identifications, enabling us to explore their location on the star formation rate:stellar mass (SFR:M*) plane. Crucially, our new deep 850-μm-selected sample reaches flux densities equivalent to SFR ≃ 100 M⊙ yr−1, enabling us to confirm that sub-mm galaxies form the high-mass end of the ‘main sequence’ (MS) of star-forming galaxies at z > 1.5 (with a mean specific SFR of sSFR = 2.25 ± 0.19 Gyr−1 at z ≃ 2.5). Our results are consistent with no significant flattening of the MS towards high masses at these redshifts. However, our results add to the growing evidence that average sSFR rises only slowly at high redshift, resulting in log10sSFR being an apparently simple linear function of the age of the Universe.

KW - galaxies: evolution, galaxies: high-redshift, galaxies: starburst, cosmology: observations, submillimetre: galaxies

U2 - 10.1093/mnras/stw564

DO - 10.1093/mnras/stw564

M3 - Article

SN - 0035-8711

VL - 458

SP - 4321

EP - 4344

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

The SCUBA-2 Cosmology Legacy Survey: galaxies in the deep 850 $m survey, and the star-forming `main sequence'

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