TY - JOUR

T1 - An ALMA survey of the SCUBA-2 CLS UDS field: Physical properties of 707 Sub-millimetre Galaxies

AU - Dudzevičiūtė, U.

AU - Smail, Ian

AU - Swinbank, A. M.

AU - Stach, S. M.

AU - Almaini, O.

AU - da Cunha, E.

AU - An, Fang Xia

AU - Arumugam, V.

AU - Birkin, J.

AU - Blain, A. W.

AU - Chapman, S. C.

AU - Chen, C.-C.

AU - Conselice, C. J.

AU - Coppin, K. E. K.

AU - Dunlop, J. S.

AU - Farrah, D.

AU - Geach, J. E.

AU - Gullberg, B.

AU - Hartley, W. G.

AU - Hodge, J. A.

AU - Ivison, R. J.

AU - Maltby, D. T.

AU - Scott, D.

AU - Simpson, C. J.

AU - Simpson, J. M.

AU - Thomson, A. P.

AU - Walter, F.

AU - Wardlow, J. L.

AU - Weiss, A.

AU - van der Werf, P.

N1 - This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version U Dudzevičiūtė, Ian Smail, A M Swinbank, S M Stach, O Almaini, E da Cunha, Fang Xia An, V Arumugam, J Birkin, A W Blain, S C Chapman, C-C Chen, C J Conselice, K E K Coppin, J S Dunlop, D Farrah, J E Geach, B Gullberg, W G Hartley, J A Hodge, R J Ivison, D T Maltby, D Scott, C J Simpson, J M Simpson, A P Thomson, F Walter, J L Wardlow, A Weiss, P van der Werf, An ALMA survey of the SCUBA-2 CLS UDS field: physical properties of 707 sub-millimetre galaxies, Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 3, May 2020, Pages 3828–3860, https://doi.org/10.1093/mnras/staa769 is available online at: https://academic.oup.com/mnras/article/494/3/3828/5815090

PY - 2020/5/16

Y1 - 2020/5/16

N2 - We analyse the physical properties of a large, homogeneously selected sample of ALMA-located sub-mm galaxies (SMGs) detected in the SCUBA-2 CLS 850-$\mu$m map of the UKIDSS/UDS field. This survey, AS2UDS, identified 707 SMGs across the ~1 sq.deg. field, including ~17 per cent which are undetected in the optical/near-infrared to $K$>~25.7 mag. We interpret the UV-to-radio data using a physically motivated model, MAGPHYS and determine a median photometric redshift of z=2.61+-0.08, with a 68th percentile range of z=1.8-3.4 and just ~6 per cent at z>4. The redshift distribution is well fit by a model combining evolution of the gas fraction in halos with the growth of halo mass past a threshold of ~4x10$^{12}$M$_\odot$, thus SMGs may represent the highly efficient collapse of gas-rich massive halos. Our survey provides a sample of the most massive, dusty galaxies at z>~1, with median dust and stellar masses of $M_d$=(6.8+-0.3)x10$^{8}$M$_\odot$ (thus, gas masses of ~10$^{11}$M$_\odot$) and $M_\ast=$(1.26+-0.05)x10$^{11}$M$_\odot$. These galaxies have gas fractions of $f_{gas}=$0.41+-0.02 with depletion timescales of ~150Myr. The gas mass function evolution at high masses is consistent with constraints at lower masses from blind CO-surveys, with an increase to z~2-3 and then a decline at higher redshifts. The space density and masses of SMGs suggests that almost all galaxies with $M_\ast$>~2x10$^{11}$M$_\odot$ have passed through an SMG-like phase. We find no evolution in dust temperature at a constant far-infrared luminosity across z~1.5-4. We show that SMGs appear to behave as simple homologous systems in the far-infrared, having properties consistent with a centrally illuminated starburst. Our study provides strong support for an evolutionary link between the active, gas-rich SMG population at z>1 and the formation of massive, bulge-dominated galaxies across the history of the Universe.

AB - We analyse the physical properties of a large, homogeneously selected sample of ALMA-located sub-mm galaxies (SMGs) detected in the SCUBA-2 CLS 850-$\mu$m map of the UKIDSS/UDS field. This survey, AS2UDS, identified 707 SMGs across the ~1 sq.deg. field, including ~17 per cent which are undetected in the optical/near-infrared to $K$>~25.7 mag. We interpret the UV-to-radio data using a physically motivated model, MAGPHYS and determine a median photometric redshift of z=2.61+-0.08, with a 68th percentile range of z=1.8-3.4 and just ~6 per cent at z>4. The redshift distribution is well fit by a model combining evolution of the gas fraction in halos with the growth of halo mass past a threshold of ~4x10$^{12}$M$_\odot$, thus SMGs may represent the highly efficient collapse of gas-rich massive halos. Our survey provides a sample of the most massive, dusty galaxies at z>~1, with median dust and stellar masses of $M_d$=(6.8+-0.3)x10$^{8}$M$_\odot$ (thus, gas masses of ~10$^{11}$M$_\odot$) and $M_\ast=$(1.26+-0.05)x10$^{11}$M$_\odot$. These galaxies have gas fractions of $f_{gas}=$0.41+-0.02 with depletion timescales of ~150Myr. The gas mass function evolution at high masses is consistent with constraints at lower masses from blind CO-surveys, with an increase to z~2-3 and then a decline at higher redshifts. The space density and masses of SMGs suggests that almost all galaxies with $M_\ast$>~2x10$^{11}$M$_\odot$ have passed through an SMG-like phase. We find no evolution in dust temperature at a constant far-infrared luminosity across z~1.5-4. We show that SMGs appear to behave as simple homologous systems in the far-infrared, having properties consistent with a centrally illuminated starburst. Our study provides strong support for an evolutionary link between the active, gas-rich SMG population at z>1 and the formation of massive, bulge-dominated galaxies across the history of the Universe.

KW - Astrophysics - Astrophysics of Galaxies

U2 - 10.1093/mnras/staa769

DO - 10.1093/mnras/staa769

M3 - Journal article

VL - 494

SP - 3828

EP - 3860

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -