An ALMA Spectroscopic Survey of the Brightest Submillimeter Galaxies in the SCUBA-2-COSMOS field (AS2COSPEC): Survey Description and First Results

Abstract

We introduce an ALMA band 3 spectroscopic survey, targeting the brightest submillimeter galaxies (SMGs) in the COSMOS field. Here we present the first results based on the 18 primary SMGs that have 870 $\mu$m flux densities of $S_{870}=12.4-19.3$ mJy and are drawn from a parent sample of 260 ALMA-detected SMGs from the AS2COSMOS survey. We detect emission lines in 17 and determine their redshifts to be in the range of $z=2-5$ with a median of $3.3\pm 0.3$. We confirm that SMGs with brighter $S_{870}$ are located at higher redshifts. The data additionally cover five fainter companion SMGs, and we obtain line detection in one. Together with previous studies, our results indicate that for SMGs that satisfy our selection, their brightest companion SMGs are physically associated with their corresponding primary SMGs in $\ge 40$% of the time, suggesting that mergers play a role in the triggering of star formation. By modeling the foreground gravitational fields, $<10$% of the primary SMGs can be strongly lensed with a magnification $\mu >2$. We determine that about 90\% of the primary SMGs have lines that are better described by double Gaussian profiles, and the median separation of the two Gaussian peaks is 430$\pm$40 km s${}^{-1}$. This allows estimates of an average baryon mass, which together with the line dispersion measurements puts our primary SMGs on the similar mass-$\sigma$ correlation found on local early-type galaxies. Finally, the number density of our $z>4$ primary SMGs is found to be $1_{-0.6}^{+0.9}\times 10^6$ cMpc${}^{-3}$, suggesting that they can be the progenitors of $z\sim 3-4$ massive quiescent galaxies.

30 pages, 16 figures, ApJ in press

References in corpus (62)

• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• COSMOS2020: A panchromatic view of the Universe to $z\sim 10$ from two complementary catalogs
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• The SCUBA-2 Cosmology Legacy Survey: 850um maps, catalogues and number counts
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies
• Kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies
• An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: High resolution 870um source counts
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the rest-frame far-infrared emission of sub-millimeter galaxies
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Survey Description
• Astrophysical and Cosmological Information from Large-scale sub-mm Surveys of Extragalactic Sources
• Multi-scale cluster lens mass mapping I. Strong Lensing modelling
• Submillimetre galaxies in a hierarchical universe: number counts, redshift distribution, and implications for the IMF
• High-redshift star formation in the ALMA era
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the bright-end of the sub-millimeter number counts
• The Evolution of the IR Luminosity Function and Dust-obscured Star Formation in the Last 13 Billion Years
• Dynamical properties of z $\sim 4.5$ dusty star-forming galaxies and their connection with local early type galaxies
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Near-infrared morphologies and stellar sizes
• The Herschel-ATLAS: a sample of 500μm-selected lensed galaxies over 600 square degrees
• The Rest-Frame Submillimeter Spectrum of High-Redshift, Dusty, Star-Forming Galaxies
• An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: Spectroscopic redshifts
• An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Source catalogue and properties
• A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang
• The Complete Redshift Distribution of Dusty Star-forming Galaxies from the SPT-SZ Survey
• The space density of luminous dusty star-forming galaxies at $z>4$: SCUBA-2 and LABOCA imaging of ultrared galaxies from $Herschel$-ATLAS
• Rotation Curves in z~1-2 Star-Forming Disks: Evidence for Cored Dark Matter Distributions
• An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: High-resolution dust continuum morphologies and the link between sub-millimetre galaxies and spheroid formation
• The East Asian Observatory SCUBA--2 survey of the COSMOS field: unveiling 1147 bright sub-millimeter sources across 2.6 square degrees
• An ALMA/NOEMA survey of the molecular gas properties of high-redshift star-forming galaxies
• AUTO-MULTITHRESH: A General Purpose Automasking Algorithm
• A spatially resolved study of cold dust, molecular gas, HII regions, and stars in the $z=2.12$ submillimeter galaxy ALESS67.1
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) - VII. Optical/IR photometry and stellar masses of sub-millimeter galaxies
• An ALMA survey of the brightest sub-millimetre sources in the SCUBA-2 COSMOS field
• Simulated observations of sub-millimetre galaxies: the impact of single-dish resolution and field variance
• The nature of sub-millimeter and highly star-forming galaxies in the EAGLE simulation
• No evidence for [CII] halos or high-velocity outflows in z>6 quasar host galaxies
• Reproducing sub-millimetre galaxy number counts with cosmological hydrodynamic simulations
• The MASSIVE survey - XI. What drives the molecular gas properties of early-type galaxies
• Physical properties and evolution of (Sub-)millimeter selected galaxies in the galaxy formation simulation Shark
• Powderday: Dust Radiative Transfer for Galaxy Simulations
• Massive and old quiescent galaxies at high redshift
• The Atacama Large Aperture Submillimetre Telescope (AtLAST)
• Characterization of Two 2mm-detected Optically-Obscured Dusty Star-Forming Galaxies
• Measurements of the dust properties in z~1-3 SMGs with ALMA
• Evidence for Cold-stream to Hot-accretion Transition as Traced by Lyα Emission from Groups and Clusters at 2 < z < 3.3
• NOEMA redshift measurements of bright Herschel galaxies
• On the far-infrared metallicity diagnostics: applications to high-redshift galaxies
• Faint Submillimeter Galaxies identified through their optical/near-infrared colours I: spatial clustering and halo masses
• X-shooter Spectroscopy and HST Imaging of 15 Ultra Massive Quiescent Galaxies at $z\gtrsim 2$
• Properties of Submillimeter Galaxies in a Semi-analytic Model using the "Count Matching" Approach: Application to the ECDF-S
• Submillimetre galaxies in cosmological hydrodynamical simulations -- an opportunity for constraining feedback models
• The ALMA Spectroscopic Survey in the HUDF: A model to explain observed 1.1 and 0.85 millimeter dust continuum number counts
• A High-Resolution Investigation of the Multi-Phase ISM in a Galaxy during the First Two Billion Years
• The Bright Extragalactic ALMA Redshift Survey (BEARS) I: redshifts of bright gravitationally-lensed galaxies from the Herschel ATLAS
• Multi-wavelength properties of radio and machine-learning identified counterparts to submillimeter sources in S2COSMOS
• An ALMA survey of the SCUBA-2 Cosmology Legacy SurveyUKIDSS/UDS Field: Halo Masses for Submillimetre Galaxies
• IRAM 30m-EMIR Redshift Search of z = 3-4 Lensed Dusty Starbursts selected from the HerBS sample
• The redshift and star formation mode of AzTEC2: a pair of massive galaxies at $z=4.63$
• FIR-luminous [CII] emitters in the ALMA-SCUBA-2 COSMOS survey (AS2COSMOS): The nature of submillimeter galaxies in a 10 comoving Mpc-scale structure at z~4.6
• SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) IV: Spatial clustering and halo masses of 450-$\mu$m-selected sub-millimeter galaxies
• Towards precise galaxy evolution: a comparison between spectral indices of $z\sim 1$ galaxies in the IllustrisTNG simulation and the LEGA-C survey
• NOEMA Redshift Measurements of Extremely Bright Submillimeter Galaxies Near the GOODS-N

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• ALMA Lensing Cluster Survey: ALMA-Herschel Joint Study of Lensed Dusty Star-Forming Galaxies across $z\simeq 0.5-6$
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• JWST PRIMER: A deep JWST study of all ALMA-detected galaxies in PRIMER COSMOS -- dust-obscured star-formation history back to z $\simeq$ 7
• SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). V. Confusion-limited Submillimeter Galaxy Number Counts at 450 $\mu$m and Data Release for the COSMOS Field
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• A High-resolution Far-infrared Survey to Probe Black Hole-Galaxy Co-evolution
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• Tight correlation of star formation with [Ci] and CO lines across cosmic time
• The NIKA2 cosmological legacy survey at 2 mm: catalogs, colors, redshift distributions, and implications for deep surveys
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