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An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south: The far-infrared properties of SMGs

Swinbank, A M; Simpson, J M; Smail, Ian; Hodge, Jacqueline; Karim, A; Walter, Fabian; Alexander, D M; Brandt, W N; De Breuck, C; da Cunha, Elisabete; Chapman, Scott C.

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We exploit Atacama Large Millimeter Array (ALMA) 870 μm observations of sub-millimetre sources in the Extended Chandra Deep Field South to investigate the far-infrared properties of high-redshift sub-millimetre galaxies (SMGs). Using the precisely located 870 μm ALMA positions of 99 SMGs, together with 24μm and radio imaging, we deblend the Herschel/SPIRE imaging to extract their far-infrared fluxes and colours. The median redshifts for ALMA LESS (ALESS) SMGs which are detected in at least two...[Show more]

dc.contributor.authorSwinbank, A M
dc.contributor.authorSimpson, J M
dc.contributor.authorSmail, Ian
dc.contributor.authorHodge, Jacqueline
dc.contributor.authorKarim, A
dc.contributor.authorWalter, Fabian
dc.contributor.authorAlexander, D M
dc.contributor.authorBrandt, W N
dc.contributor.authorDe Breuck, C
dc.contributor.authorda Cunha, Elisabete
dc.contributor.authorChapman, Scott C.
dc.date.accessioned2018-11-29T22:53:33Z
dc.date.available2018-11-29T22:53:33Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/152509
dc.description.abstractWe exploit Atacama Large Millimeter Array (ALMA) 870 μm observations of sub-millimetre sources in the Extended Chandra Deep Field South to investigate the far-infrared properties of high-redshift sub-millimetre galaxies (SMGs). Using the precisely located 870 μm ALMA positions of 99 SMGs, together with 24μm and radio imaging, we deblend the Herschel/SPIRE imaging to extract their far-infrared fluxes and colours. The median redshifts for ALMA LESS (ALESS) SMGs which are detected in at least two SPIRE bands increases with wavelength of the peak in their spectral energy distributions (SEDs), with z = 2.3 ± 0.2, 2.5 ± 0.3 and 3.5 ± 0.5 for the 250, 350 and 500 μm peakers, respectively. 34 ALESS SMGs do not have a >3σ counterpart at 250, 350 or 500 μm. These galaxies have a median photometric redshift derived from the rest-frame UV–mid-infrared SEDs of z = 3.3 ± 0.5, which is higher than the full ALESS SMG sample; z = 2.5 ± 0.2. We estimate the far-infrared luminosities and characteristic dust temperature of each SMG, deriving LIR = (3.0 ± 0.3) × 1012 L⊙ (SFR = 300 ± 30 M⊙ yr−1) and Td = 32 ± 1 K. The characteristic dust temperature of these high-redshift SMGs is ΔTd = 3–5 K lower than comparably luminous galaxies at z = 0, reflecting the more extended star formation in these systems. We show that the contribution of S870 μm ≥ 1 mJy SMGs to the cosmic star formation budget is 20 per cent of the total over the redshift range z ∼ 1–4. Adopting an appropriate gas-to-dust ratio, we estimate a typical molecular mass of the ALESS SMGs of MH2 = (4.2 ± 0.4) × 1010 M⊙. Finally, we show that SMGs with S870 μm > 1 mJy (LIR ≳ 1012 L⊙) contain ∼ 10 per cent of the z ∼ 2 volume-averaged H2 mass density.
dc.format.mimetypeapplication/pdf
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleAn ALMA survey of sub-millimetre galaxies in the extended chandra deep field south: The far-infrared properties of SMGs
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume438
dc.date.issued2014
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationa383154xPUB8682
local.type.statusPublished Version
local.contributor.affiliationSwinbank, A M, Durham University
local.contributor.affiliationSimpson, J M, Durham University
local.contributor.affiliationSmail, Ian, Durham University
local.contributor.affiliationHodge, Jacqueline, Max-Planck-Institut fur Astrophysik
local.contributor.affiliationKarim, A, Argelander Institute for Astronomy
local.contributor.affiliationWalter, Fabian, Max Planck Institute for Astronomy
local.contributor.affiliationAlexander, D M, University of Durham
local.contributor.affiliationBrandt, W N, Pennsylvania State University
local.contributor.affiliationDe Breuck, C, European Southern Observatory
local.contributor.affiliationda Cunha, Elisabete, College of Science, ANU
local.contributor.affiliationChapman, Scott C., Dalhousie University
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage1267
local.bibliographicCitation.lastpage1287
local.identifier.doi10.1093/mnras/stt2273
dc.date.updated2018-11-29T07:53:29Z
local.identifier.scopusID2-s2.0-84893412370
local.identifier.thomsonID000330955900029
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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