The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the bright-end of the sub-millimeter number counts

Abstract

We present high-resolution 870-um ALMA continuum maps of 30 bright sub-millimeter sources in the UKIDSS UDS field. These sources are selected from deep, 1-square degrees 850-um maps from the SCUBA--2 Cosmology Legacy Survey, and are representative of the brightest sources in the field (median SCUBA2 flux S_850=8.7+/-0.4 mJy). We detect 52 sub-millimeter galaxies (SMGs) at >4-sigma significance in our 30 ALMA maps. In 61+/-17% of the ALMA maps the single-dish source comprises a blend of >=2 SMGs, where the secondary SMGs are Ultra--Luminous Infrared Galaxies (ULIRGs) with L_IR>10^12 Lo. The brightest SMG contributes on average 80+/-4% of the single-dish flux density, and in the ALMA maps containing >=2 SMGs the secondary SMG contributes 25+/-3% of the integrated ALMA flux. We construct source counts and show that multiplicity boosts the apparent single-dish cumulative counts by 20% at S_870>7.5mJy, and by 60% at S_870>12mJy. We combine our sample with previous ALMA studies of fainter SMGs and show that the counts are well-described by a double power-law with a break at 8.5+/-0.6mJy. The break corresponds to a luminosity of ~6x10^12Lsol or a star-formation rate of ~1000Mo/yr. For the typical sizes of these SMGs, which are resolved in our ALMA data with r=1.2+/-0.1kpc, this yields a limiting SFR density of ~100Msol/yr/kpc2. Finally, the number density of S_870>2mJy SMGs is 80+/-30 times higher than that derived from blank-field counts. An over-abundance of faint SMGs is inconsistent with line-of-sight projections dominating multiplicity in the brightest SMGs, and indicates that a significant proportion of these high-redshift ULIRGs must be physically associated.

14 pages, 6 figures. ApJ in press

References in corpus (16)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) - III. Identification of radio and mid-infrared counterparts to submillimetre 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
• Submillimetre galaxies in a hierarchical universe: number counts, redshift distribution, and implications for the IMF
• Evidence for a Population of High-Redshift Submillimeter Galaxies from Interferometric Imaging
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Near-infrared morphologies and stellar sizes
• High-resolution radio observations of submillimetre galaxies
• A 1200-micron MAMBO survey of the GOODS-N field: a significant population of submillimetre drop-out galaxies
• Simulated observations of sub-millimetre galaxies: the impact of single-dish resolution and field variance
• Interferometric 890 micron Images of High Redshift Submillimeter Galaxies
• GOODS 850-5 -- A z>4 Galaxy Discovered in the Submillimeter?
• A combined re-analysis of existing blank-field SCUBA surveys: comparative 850-micron source lists, combined number counts, and evidence for strong clustering of the bright sub-mm galaxy population
• Faint Submillimeter Galaxies Revealed by Multifield Deep ALMA Observations: Number Counts, Spatial Clustering, and A Dark Submillimeter Line Emitter
• A Deep 1.2 mm Map of the Lockman Hole North Field
• Interferometric detections of GOODS 850-5 at 1 mm and 1.4 GHz

Cited by in corpus (83)

• The SCUBA-2 Cosmology Legacy Survey: 850um maps, catalogues and number counts
• Kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies
• The ALPINE-ALMA [CII] Survey: data processing, catalogs, and statistical source properties
• High-redshift star formation in the ALMA era
• 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
• Sub-kpc ALMA imaging of compact star-forming galaxies at z~2.5: revealing the formation of dense galactic cores in the progenitors of compact quiescent 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
• The Complete Redshift Distribution of Dusty Star-forming Galaxies from the SPT-SZ Survey
• 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
• Automated Mining of the ALMA Archive in the COSMOS Field (A3COSMOS): I. Robust ALMA Continuum Photometry Catalogs and Stellar Mass and Star Formation Properties for ~700 Galaxies at z=0.5-6
• ALMA Deep Field in SSA22: Source Catalog and Number Counts
• An ALMA survey of the brightest sub-millimetre sources in the SCUBA-2 COSMOS field
• GOODS-ALMA 2.0: Source catalog, number counts, and prevailing compact sizes in 1.1 mm galaxies
• The star formation histories of z~1 post-starburst galaxies
• Structural evolution in massive galaxies at z~2
• Physical Characterization of an Unlensed Dusty Star-Forming Galaxy at $z=5.85$
• The ALMA Spectroscopic Survey in the HUDF: Deep 1.2 mm continuum number counts
• Mapping Obscuration to Reionization with ALMA (MORA): 2mm Efficiently Selects the Highest-Redshift Obscured Galaxies
• The nature of sub-millimeter and highly star-forming galaxies in the EAGLE simulation
• An ALMA survey of submillimetre galaxies in the COSMOS field: Physical properties derived from energy balance spectral energy distribution modelling
• ALMA twenty-six arcmin${}^2$ survey of GOODS-S at one-millimeter (ASAGAO): Near-infrared-dark faint ALMA sources
• Reproducing sub-millimetre galaxy number counts with cosmological hydrodynamic simulations
• Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2
• The SCUBA-2 Cosmology Legacy Survey: The EGS deep field I - Deep number counts and the redshift distribution of the recovered Cosmic Infrared Background at 450 and 850 um
• Knocking on giants' doors: I. The evolution of the dust-to-stellar mass ratio in distant dusty galaxies
• SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-End Counts at 450 um
• Identifying the subtle signatures of feedback from distant AGN using ALMA observations and the EAGLE hydrodynamical simulations
• Low Gas Fractions Connect Compact Star-Forming Galaxies to their z ~ 2 Quiescent Descendants
• KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at $z$$\sim$$1.4$-$2.6$
• Measurement of CIB power spectra over large sky areas from Planck HFI maps
• FOREVER22: galaxy formation in protocluster regions
• No signs of star formation being regulated in the most luminous quasars at z~2 with ALMA
• Faint Submillimeter Galaxies identified through their optical/near-infrared colours I: spatial clustering and halo masses
• An ALMA Spectroscopic Survey of the Brightest Submillimeter Galaxies in the SCUBA-2-COSMOS field (AS2COSPEC): Survey Description and First Results
• CO, H2O, H2O+ line and dust emission in a z = 3.63 strongly lensed starburst merger at sub-kiloparsec scales
• VALES: I. The molecular gas content in star-forming dusty H-ATLAS galaxies up to z=0.35
• Submillimetre galaxies in cosmological hydrodynamical simulations -- an opportunity for constraining feedback models
• The Structure of Massive Star-Forming Galaxies from JWST and ALMA: Dusty, High Redshift Disk Galaxies
• SPT0346-52: Negligible AGN Activity in a Compact, Hyper-starburst Galaxy at z = 5.7
• ALMA Survey of Lupus Class III Stars: Early Planetesimal Belt Formation and Rapid Disk Dispersal
• Dust continuum, CO, and [C I] 1-0 lines: self-consistent H2 mass estimates and the possibility of globally CO-dark galaxies at $z=0.35$
• High resolution ALMA and HST images of q${}^1$ Eri: an asymmetric debris disc with an eccentric Jupiter
• A multi-wavelength de-blended Herschel view of the statistical properties of dusty star-forming galaxies across cosmic time
• The ALMA Spectroscopic Survey in the HUDF: A model to explain observed 1.1 and 0.85 millimeter dust continuum number counts
• New debris disks in nearby young moving groups
• Multi-wavelength properties of radio and machine-learning identified counterparts to submillimeter sources in S2COSMOS
• The impact of ionised outflows from z$\sim$2.5 quasars is not through instantaneous in-situ quenching: the evidence from ALMA and VLT/SINFONI
• Submillimetre galaxies in two massive protoclusters at z = 2.24: witnessing the enrichment of extreme starbursts in the outskirts of HAE density peaks
• The bright end of the infrared luminosity functions and the abundance of hyperluminous infrared galaxies
• The Herschel-ATLAS: magnifications and physical sizes of $500\mu$m-selected strongly lensed galaxies
• Growth of Supermassive Black Hole Seeds in ETG Star-Forming Progenitors: Multiple Merging of Stellar Compact Remnants via Gaseous Dynamical Friction and Gravitational Wave Emission
• GOODS-ALMA: Using IRAC and VLA to probe fainter millimeter galaxies
• z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [II] Dust properties
• Unveiling the nature of 11 dusty star-forming galaxies at the peak of cosmic star formation history
• A Multiwavelength Study of ELAN Environments (AMUSE${}^2$). Mass budget, satellites spin alignment and gas infall in a massive $z\sim 3$ quasar host halo
• (Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies IV. Physical properties derived from spectral energy distributions
• Evidence of extended cold molecular gas and dust halos around $\mathbf{z}\sim 2.3$ Extremely Red Quasars with ALMA
• ALMACAL IX: multi-band ALMA survey for dusty star-forming galaxies and the resolved fractions of the cosmic infrared background
• SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) IV: Spatial clustering and halo masses of 450-$\mu$m-selected sub-millimeter galaxies
• An ALMA view of 11 Dusty Star Forming Galaxies at the peak of Cosmic Star Formation History
• A complete distribution of redshifts for sub-millimetre galaxies in the SCUBA-2 Cosmology Legacy Survey UDS field
• Extremely Red Submillimeter Galaxies: New z>~4-6 Candidates Discovered using ALMA and Jansky VLA
• The Black Hole Mass Function Across Cosmic Times II. Heavy Seeds and (Super)Massive Black Holes
• An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman break Galaxies
• Multi-wavelength properties of 850-$\mu$m selected sources from the North Ecliptic Pole SCUBA-2 survey
• Unveiling Sizes of Compact AGN Hosts with ALMA
• Source structure and molecular gas properties from high-resolution CO imaging of SPT-selected dusty star-forming galaxies
• Morphological Evolution of the Hosts of Far-Infrared/Submillimeter Galaxies
• The SCUBA-2 Large eXtragalactic Survey: 850um map, catalogue and the bright-end number counts of the XMM-LSS field
• The Nature of 500 micron Risers I: SMA Observations
• ALMACAL VII: First Interferometric Number Counts at 650 $\mu$m
• High resolution ALMA and HST imaging of $\kappa$CrB: a broad debris disc around a post-main sequence star with low-mass companions
• Growth of Massive Black Hole Seeds by Migration of Stellar and Primordial Black Holes: Gravitational Waves and Stochastic Background
• Distribution of star formation rates during the rapid assembly of NGC 1399 as deduced from its globular cluster system
• Modeling submillimeter galaxies in cosmological simulations: Contribution to the cosmic star formation density and predictions for future surveys
• A massive quiescent galaxy confirmed in a protocluster at z=3.09
• Deep Submillimetre and Radio Observations in the SSA22 Field. II. Sub-millimetre source catalogue and number counts
• A High-resolution Far-infrared Survey to Probe Black Hole-Galaxy Co-evolution
• A mock redshift catalogue of the dusty star-forming galaxy population with intrinsic clustering and lensing for deep millimetre surveys
• Tight correlation of star formation with [Ci] and CO lines across cosmic time
• Searching Far and Long I: Pilot ALMA 2mm Follow-up of Bright Dusty Galaxies as a Redshift Filter