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dc.contributor.authorMichalowski, M.~J.
dc.contributor.authorDunlop, J.~S.
dc.contributor.authorKoprowski, M.~P.
dc.contributor.authorCirasuolo, M.
dc.contributor.authorGeach, J.~E.
dc.contributor.authorBowler, R.~A.~A.
dc.contributor.authorMortlock, A.
dc.contributor.authorCaputi, K.~I.
dc.contributor.authorAretxaga, I.
dc.contributor.authorArumugam, V.
dc.contributor.authorChen, C.-C.
dc.contributor.authorMcLure, R.~J.
dc.contributor.authorBirkinshaw, M.
dc.contributor.authorBourne, N.
dc.contributor.authorFarrah, D.
dc.contributor.authorIbar, E.
dc.contributor.authorvan der Werf, P.
dc.contributor.authorZemcov, M.
dc.identifier.citationMichalowski , M J , Dunlop , J S , Koprowski , M P , Cirasuolo , M , Geach , J E , Bowler , R A A , Mortlock , A , Caputi , K I , Aretxaga , I , Arumugam , V , Chen , C-C , McLure , R J , Birkinshaw , M , Bourne , N , Farrah , D , Ibar , E , van der Werf , P & Zemcov , M 2017 , ' The SCUBA-2 Cosmology Legacy Survey: the nature of bright submm galaxies from 2 deg$^2$ of 850-$m imaging ' , Monthly Notices of the Royal Astronomical Society , vol. 469 , no. 1 , pp. 492-515 .
dc.identifier.otherPURE: 16294254
dc.identifier.otherPURE UUID: a4db862b-6433-4aa1-bea4-93ab9730d200
dc.identifier.otherBibtex: urn:86041c63c3b1810807999bd178ddb527
dc.identifier.otherScopus: 85026425502
dc.description© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society
dc.description.abstractWe present physical properties [redshifts (z), star-formation rates (SFRs) and stellar masses (⁠Mstar⁠)] of bright (S850 ≥ 4 mJy) submm galaxies in the ≃2 deg2 COSMOS and UDS fields selected with SCUBA-2/JCMT. We complete the galaxy identification process for all (≃2000) S/N ≥ 3.5 850-μm sources, but focus our scientific analysis on a high-quality subsample of 651 S/N ≥ 4 sources with complete multiwavelength coverage including 1.1-mm imaging. We check the reliability of our identifications, and the robustness of the SCUBA-2 fluxes by revisiting the recent ALMA follow-up of 29 sources in our sample. Considering >4 mJy ALMA sources, our identification method has a completeness of ≃86 per cent with a reliability of ≃92 per cent, and only ≃15–20 per cent of sources are significantly affected by multiplicity (when a secondary component contributes >1/3 of the primary source flux). The impact of source blending on the 850-μm source counts as determined with SCUBA-2 is modest; scaling the single-dish fluxes by ≃0.9 reproduces the ALMA source counts. For our final SCUBA-2 sample, we find median z=2.40+0.10−0.04⁠, SFR = 287 ± 6 M⊙  yr− 1 and log(Mstar/M⊙)=11.12±0.02 (the latter for 349/651 sources with optical identifications). These properties clearly locate bright submm galaxies on the high-mass end of the ‘main sequence’ of star-forming galaxies out to z ≃ 6, suggesting that major mergers are not a dominant driver of the high-redshift submm-selected population. Their number densities are also consistent with the evolving galaxy stellar mass function. Hence, the submm galaxy population is as expected, albeit reproducing the evolution of the main sequence of star-forming galaxies remains a challenge for theoretical models/simulations.en
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectdust, extinction, galaxies: evolution, galaxies: high-redshift, galaxies: star formation, galaxies: stellar content, submillimetre: galaxies
dc.titleThe SCUBA-2 Cosmology Legacy Survey: the nature of bright submm galaxies from 2 deg$^2$ of 850-$m imagingen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Engineering and Technology
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
rioxxterms.typeJournal Article/Review

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