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An alma survey of submillimeter galaxies in the extended Chandra deep field south: The redshift distribution and evolution of submillimeter galaxies

Simpson, J M; Swinbank, A M; Smail, Ian; Alexander, D M; Brandt, W N; Bertoldi, Frank; De Breuck, C; Chapman, Scott C.; Coppin, K.E.K.; da Cunha, Elisabete; Hodge, J. A.

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We present the first photometric redshift distribution for a large sample of 870 μm submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z phot = 2.3 ± 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis...[Show more]

dc.contributor.authorSimpson, J M
dc.contributor.authorSwinbank, A M
dc.contributor.authorSmail, Ian
dc.contributor.authorAlexander, D M
dc.contributor.authorBrandt, W N
dc.contributor.authorBertoldi, Frank
dc.contributor.authorDe Breuck, C
dc.contributor.authorChapman, Scott C.
dc.contributor.authorCoppin, K.E.K.
dc.contributor.authorda Cunha, Elisabete
dc.contributor.authorHodge, J. A.
dc.date.accessioned2018-11-29T22:52:29Z
dc.date.available2018-11-29T22:52:29Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/152189
dc.description.abstractWe present the first photometric redshift distribution for a large sample of 870 μm submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z phot = 2.3 ± 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis of Herschel observations confirms they are not spurious. Assuming that these SMGs have an absolute H-band magnitude distribution comparable to that of a complete sample of z ~ 1-2 SMGs, we demonstrate that they lie at slightly higher redshifts, raising the median redshift for SMGs to z phot = 2.5 ± 0.2. Critically we show that the proportion of galaxies undergoing an SMG-like phase at z ≥ 3 is at most 35% ± 5% of the total population. We derive a median stellar mass of M sstarf = (8 ± 1) × 1010 M ☉, although there are systematic uncertainties of up to 5 × for individual sources. Assuming that the star formation activity in SMGs has a timescale of ~100 Myr, we show that their descendants at z ~ 0 would have a space density and MH distribution that are in good agreement with those of local ellipticals. In addition, the inferred mass-weighted ages of the local ellipticals broadly agree with the look-back times of the SMG events. Taken together, these results are consistent with a simple model that identifies SMGs as events that form most of the stars seen in the majority of luminous elliptical galaxies at the present day.
dc.format.mimetypeapplication/pdf
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleAn alma survey of submillimeter galaxies in the extended Chandra deep field south: The redshift distribution and evolution of submillimeter galaxies
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume788
dc.date.issued2014
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationa383154xPUB8689
local.type.statusPublished Version
local.contributor.affiliationSimpson, J M, Durham University
local.contributor.affiliationSwinbank, A M, Durham University
local.contributor.affiliationSmail, Ian, Durham University
local.contributor.affiliationAlexander, D M, University of Durham
local.contributor.affiliationBrandt, W N, Pennsylvania State University
local.contributor.affiliationBertoldi, Frank, Argelander Institute for Astronomy
local.contributor.affiliationDe Breuck, C, European Southern Observatory
local.contributor.affiliationChapman, Scott C., Dalhousie University
local.contributor.affiliationCoppin, K.E.K., University of Hertfordshire
local.contributor.affiliationda Cunha, Elisabete, College of Science, ANU
local.contributor.affiliationHodge, J. A., National Radio Astronomy Observatory
local.bibliographicCitation.issue2
local.identifier.doi10.1088/0004-637X/788/2/125
dc.date.updated2018-11-29T07:46:38Z
local.identifier.scopusID2-s2.0-84902167620
local.identifier.thomsonID000337466200028
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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