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THE ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: CONTINUUM NUMBER COUNTS, RESOLVED 1.2 mm EXTRAGALACTIC BACKGROUND, AND PROPERTIES OF THE FAINTEST DUSTY STAR-FORMING GALAXIES

Aravena, M.; Decarli, Roberto; Walter, F.; da Cunha, Elisabete; Bauer, F. E.; Carilli, C L; Daddi, E; Elbaz, David; Ivison, Robert J; Riechers, Dominik; Smail, Ian

Description

We present an analysis of a deep (1σ = 13 μJy) cosmological 1.2 mm continuum map based on ASPECS, the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field. In the 1 arcmin2 covered by ASPECS we detect nine sources at $\gt 3.5\sigma $ significance at 1.2 mm. Our ALMA-selected sample has a median redshift of $z=1.6\pm 0.4$, with only one galaxy detected at z > 2 within the survey area. This value is significantly lower than that found in millimeter samples selected at a higher flux density...[Show more]

dc.contributor.authorAravena, M.
dc.contributor.authorDecarli, Roberto
dc.contributor.authorWalter, F.
dc.contributor.authorda Cunha, Elisabete
dc.contributor.authorBauer, F. E.
dc.contributor.authorCarilli, C L
dc.contributor.authorDaddi, E
dc.contributor.authorElbaz, David
dc.contributor.authorIvison, Robert J
dc.contributor.authorRiechers, Dominik
dc.contributor.authorSmail, Ian
dc.date.accessioned2018-11-29T22:52:44Z
dc.date.available2018-11-29T22:52:44Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/152264
dc.description.abstractWe present an analysis of a deep (1σ = 13 μJy) cosmological 1.2 mm continuum map based on ASPECS, the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field. In the 1 arcmin2 covered by ASPECS we detect nine sources at $\gt 3.5\sigma $ significance at 1.2 mm. Our ALMA-selected sample has a median redshift of $z=1.6\pm 0.4$, with only one galaxy detected at z > 2 within the survey area. This value is significantly lower than that found in millimeter samples selected at a higher flux density cutoff and similar frequencies. Most galaxies have specific star formation rates (SFRs) similar to that of main-sequence galaxies at the same epoch, and we find median values of stellar mass and SFRs of $4.0\times {10}^{10}\ {M}_{\odot }$ and $\sim 40\,{M}_{\odot }$ yr−1, respectively. Using the dust emission as a tracer for the interstellar medium (ISM) mass, we derive depletion times that are typically longer than 300 Myr, and we find molecular gas fractions ranging from ~0.1 to 1.0. As noted by previous studies, these values are lower than those using CO-based ISM estimates by a factor of ~2. The 1 mm number counts (corrected for fidelity and completeness) are in agreement with previous studies that were typically restricted to brighter sources. With our individual detections only, we recover 55% ± 4% of the extragalactic background light (EBL) at 1.2 mm measured by the Planck satellite, and we recover 80% ± 7% of this EBL if we include the bright end of the number counts and additional detections from stacking. The stacked contribution is dominated by galaxies at $z\sim 1\mbox{--}2$, with stellar masses of (1–3) × 1010 M ${}_{\odot }$. For the first time, we are able to characterize the population of galaxies that dominate the EBL at 1.2 mm.
dc.format.mimetypeapplication/pdf
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleTHE ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: CONTINUUM NUMBER COUNTS, RESOLVED 1.2 mm EXTRAGALACTIC BACKGROUND, AND PROPERTIES OF THE FAINTEST DUSTY STAR-FORMING GALAXIES
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume833
dc.date.issued2016
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu5227626xPUB24
local.type.statusPublished Version
local.contributor.affiliationAravena, M., Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales
local.contributor.affiliationDecarli, Roberto, Max-Planck Institut fur Astronomie
local.contributor.affiliationWalter, F., Max Planck Institut fur Astronomie
local.contributor.affiliationda Cunha, Elisabete, College of Science, ANU
local.contributor.affiliationBauer, F. E., Pontificia Universidad Católica de Chile
local.contributor.affiliationCarilli, C L, National Radio Astronomy Observatory
local.contributor.affiliationDaddi, E, CEA-Saclay
local.contributor.affiliationElbaz, David, CEA/DSM-CNRS-Universite Paris Diderot, Irfu/Service d’Astrophysique
local.contributor.affiliationIvison, Robert J, Royal Observatory Edinburgh
local.contributor.affiliationRiechers, Dominik, Cornell University
local.contributor.affiliationSmail, Ian, Durham University
local.bibliographicCitation.issue1
local.identifier.doi10.3847/1538-4357/833/1/68
dc.date.updated2018-11-29T07:48:22Z
local.identifier.thomsonID000393677500001
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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