On the redshift distribution and physical properties of ACT-selected DSFGs

Abstract

We present multi-wavelength detections of nine candidate gravitationally-lensed dusty star-forming galaxies (DSFGs) selected at 218GHz (1.4mm) from the ACT equatorial survey. Among the brightest ACT sources, these represent the subset of the total ACT sample lying in Herschel SPIRE fields, and all nine of the 218GHz detections were found to have bright Herschel counterparts. By fitting their spectral energy distributions (SEDs) with a modified blackbody model with power-law temperature distribution, we find the sample has a median redshift of $z=4.1_{-1.0}^{+1.1}$ (68 per cent confidence interval), as expected for 218GHz selection, and an apparent total infrared luminosity of ${\log }_{10}(\mu L_{\mathrm{IR}}/{\mathrm{L}}_{\odot })=13.86_{-0.30}^{+0.33}$, which suggests that they are either strongly lensed sources or unresolved collections of unlensed DSFGs. The effective apparent diameter of the sample is $\sqrt{\mu }d=4.2_{-1.0}^{+1.7}$kpc, further evidence of strong lensing or multiplicity, since the typical diameter of dusty star-forming galaxies is $1.0$--$2.5$ kpc. We emphasize that the effective apparent diameter derives from SED modelling without the assumption of optically thin dust (as opposed to image morphology). We find that the sources have substantial optical depth ($\tau =4.2_{-1.9}^{+3.7}$) to dust around the peak in the modified blackbody spectrum (${\lambda }_{\mathrm{obs}}\le 500$ $\mu$m), a result that is robust to model choice.

arXiv comment18 pages, 9 figures. Accepted to MNRAS

References in corpus (109)

• emcee: The MCMC Hammer
• The Sloan Digital Sky Survey: Technical Summary
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Cosmic Star Formation History
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The Herschel-SPIRE instrument and its in-flight performance
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• High Redshift Galaxies in the Hubble Deep Field. Color Selection and Star Formation History to z=4
• On the normalisation of the cosmic star formation history
• The reversal of the star formation-density relation in the distant universe
• Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth
• A Redshift Survey of the Submillimeter Galaxy Population
• GOODS-Herschel: an infrared main sequence for star-forming galaxies
• Cool Gas in High Redshift Galaxies
• The Infrared Spectral Energy Distribution of Normal Star-Forming Galaxies: Calibration at Far-Infrared and Submillimeter Wavelengths
• Submillimeter Galaxies
• Infrared luminosity functions from the Chandra Deep Field South : the Spitzer view on the history of dusty star formation at 0<z<1
• Dusty Star-Forming Galaxies at High Redshift
• The Herschel Multi-tiered Extragalactic Survey: HerMES
• A Dust-Obscured Massive Maximum-Starburst Galaxy at a Redshift of 6.34
• High-resolution Millimeter Imaging of Submillimeter Galaxies
• Spitzer view on the evolution of star-forming galaxies from z=0 to z~3
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• On the effect of the Cosmic Microwave Background in high-redshift (sub-)millimeter observations
• An Accurate Flux Density Scale from 1 to 50 GHz
• Far-infrared Spectral Energy Distribution Fitting for Galaxies Near and Far
• Intense Star Formation within Resolved Compact Regions in a Galaxy at z=2.3
• Advanced ACTPol Cryogenic Detector Arrays and Readout
• SHARC-2 350 Micron Observations of Distant Submillimeter Selected Galaxies
• Extragalactic millimeter-wave sources in South Pole Telescope survey data: source counts, catalog, and statistics for an 87 square-degree field
• Galaxy Clusters Selected with the Sunyaev-Zel'dovich Effect from 2008 South Pole Telescope Observations
• Detection of lensing substructure using ALMA observations of the dusty galaxy SDP.81
• Tracing the molecular gas in distant submillimetre galaxies via CO(1-0) imaging with the EVLA
• HerMES: The SPIRE confusion limit
• ALMA redshifts of millimeter-selected galaxies from the SPT survey: The redshift distribution of dusty star-forming galaxies
• A Herschel view of the far-infrared properties of submillimetre galaxies
• The Atacama Cosmology Telescope: The Receiver and Instrumentation
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the rest-frame far-infrared emission of sub-millimeter galaxies
• A unified empirical model for infrared galaxy counts based on observed physical evolution of distant galaxies
• Gravitational Lens Models Based on Submillimeter Array Imaging of Herschel-selected Strongly Lensed Sub-millimeter Galaxies at z>1.5
• ALMA Imaging and Gravitational Lens Models of South Pole Telescope-Selected Dusty, Star-Forming Galaxies at High Redshifts
• Submillimetre and far-infrared spectral energy distributions of galaxies: the luminosity-temperature relation and consequences for photometric redshifts
• ALMA Imaging of Gas and Dust in a Galaxy Protocluster at Redshift 5.3: [CII] Emission in "Typical" Galaxies and Dusty Starbursts ~1 Billion Years after the Big Bang
• Compact starbursts in z~3-6 submillimeter galaxies revealed by ALMA
• Optical Design of the Atacama Cosmology Telescope and the Millimeter Bolometric Array Camera
• Evidence for extended, obscured starbursts in submm galaxies
• The Herschel Multi-Tiered Extragalactic Survey: Source Extraction and Cross-Identifications in Confusion-Dominated SPIRE Images
• Gas and dust in a submillimeter galaxy at z = 4.24 from the Herschel ATLAS
• HerMES: Candidate Gravitationally Lensed Galaxies and Lensing Statistics at Submillimeter Wavelengths
• Luminous Infrared Galaxies with the Submillimeter Array: I. Survey Overview and the Central Gas to Dust Ratio
• The rapid assembly of an elliptical galaxy of 400 billion solar masses at a redshift of 2.3
• The redshift distribution of dusty star forming galaxies from the SPT survey
• Extragalactic millimeter-wave point source catalog, number counts and statistics from 771 square degrees of the SPT-SZ Survey
• Blind detections of CO J = 1--0 in 11 H-ATLAS galaxies at z = 2.1--3.5 with the GBT/Zpectrometer
• A hybrid model for the evolution of galaxies and Active Galactic Nuclei in the infrared
• The Herschel Stripe 82 Survey (HerS): Maps and Early Catalog
• SMA Imaging of CO(3-2) Line and 860 micron Continuum of Arp 220 : Tracing the Spatial Distribution of Luminosity
• A census of metals at high and low redshifts and the connection between submillimetre sources and spheroid formation
• ALMA Observations of SPT-Discovered, Strongly Lensed, Dusty, Star-Forming Galaxies
• The Physical Scale of the Far-Infrared Emission in the Most Luminous Submillimeter Galaxies
• Vindicating single-T modified blackbody fits to Herschel SEDs (Research Note)
• StarFinder: an IDL GUI based code to analyze crowded fields with isoplanatic correcting PSF fitting
• ALMA Long Baseline Observations of the Strongly Lensed Submillimeter Galaxy HATLAS J090311.6+003906 at z=3.042
• High-resolution radio observations of submillimetre galaxies
• HerMES: Candidate High-Redshift Galaxies Discovered with Herschel/SPIRE
• Gas-rich mergers and feedback are ubiqitous amongst starbursting radio galaxies, as revealed by JVLA, IRAM PdBI and Herschel
• Planck's Dusty GEMS: Gravitationally lensed high-redshift galaxies discovered with the Planck survey
• The Herschel Multi-Tiered Extragalactic Survey: SPIRE-mm Photometric Redshifts
• A joint analysis of BLAST 250--500um and LABOCA 870um observations in the Extended Chandra Deep Field South
• A Comprehensive View of a Strongly Lensed Planck-Associated Submillimeter Galaxy
• Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMA
• Discovery of a Multiply-Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE Data
• Strong biases in infrared-selected gravitational lenses
• The Atacama Cosmology Telescope: Data Characterization and Map Making
• Dust temperture and the submillimetre-radio flux density ratio as a redshift indicator for distant galaxies
• CO J=1-0 spectroscopy of four submillimeter galaxies with the Zpectrometer on the Green Bank Telescope
• Molecular Superbubbles in the Starburst Galaxy NGC 253
• Submillimeter Observations of Millimeter Bright Galaxies Discovered by the South Pole Telescope
• Candidate Gravitationally Lensed Dusty Star-forming Galaxies in the Herschel Wide Area Surveys
• The Spitzer-HETDEX Exploratory Large-Area Survey
• HerMES: A search for high-redshift dusty galaxies in the HerMES Large Mode Survey - Catalogue, number counts and early results
• Early Science with the Large Millimeter Telescope: Observations of Extremely Luminous High-z Sources Identified by Planck
• HerMES: point source catalogues from deep Herschel-SPIRE observations
• Dark Matter Substructure Detection Using Spatially Resolved Spectroscopy of Lensed Dusty Galaxies
• Imaging the Molecular Gas Properties of a Major Merger Driving the Evolution of a z=2.5 Submillimeter Galaxy
• Flux Calibration of Broadband Far Infrared and Submillimetre Photometric Instruments: Theory and Application to Herschel-SPIRE
• Substructure in the lens HE 0435-1223
• Extreme dust disks in Arp 220 as revealed by ALMA
• Far-Infrared Properties of Spitzer-selected Luminous Starbursts
• The Atacama Cosmology Telescope: Dusty Star-Forming Galaxies and Active Galactic Nuclei in the Southern Survey
• HerMES: Point source catalogues from Herschel-SPIRE observations II
• The influence of wavelength, flux, and lensing selection effects on the redshift distribution of dusty, star-forming galaxies
• Effects of Strong Gravitational Lensing on Millimeter-Wave Galaxy Number Counts
• The Atacama Cosmology Telescope: Beam Measurements and the Microwave Brightness Temperatures of Uranus and Saturn
• ALMA imaging of SDP.81 - II. A pixelated reconstruction of the CO emission lines
• Herschel-ATLAS: Modelling the first strong gravitational lenses
• A Detailed Gravitational Lens Model Based on Submillimeter Array and Keck Adaptive Optics Imaging of a Herschel-ATLAS Sub-millimeter Galaxy at z=4.243
• SpIES: The Spitzer IRAC Equatorial Survey
• The GISMO 2-millimeter Deep Field in GOODS-N
• High-resolution ALMA Observations of SDP.81. II. Molecular Clump Properties of a Lensed Submillimeter Galaxy at z=3.042
• The Red Radio Ring: a gravitationally lensed hyperluminous infrared radio galaxy at z=2.553 discovered through citizen science
• SPT 0538-50: Physical conditions in the ISM of a strongly lensed dusty star-forming galaxy at z=2.8
• The Innermost Mass Distribution of the Gravitational Lens SDP.81 from ALMA Observations
• A Measurement of the Millimeter Emission and the Sunyaev-Zel'dovich Effect Associated with Low-Frequency Radio Sources
• Star and dust formation activities in AzTEC-3: A starburst galaxy at z = 5.3
• HerMES: Spectral Energy Distributions of Submillimeter Galaxies at z >4
• Selection of ULIRGs in Infrared and Submm Surveys

Cited by in corpus (27)

• Turbulent Gas in Lensed Planck-selected Starbursts at redshifts 1-3.5
• An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution
• HerMES: A search for high-redshift dusty galaxies in the HerMES Large Mode Survey - Catalogue, number counts and early results
• The Atacama Cosmology Telescope: Probing the Baryon Content of SDSS DR15 Galaxies with the Thermal and Kinematic Sunyaev-Zel'dovich Effects
• Atacama Cosmology Telescope: Dusty star-forming galaxies and active galactic nuclei in the equatorial survey
• A magnified view of circumnuclear star formation and feedback around an AGN at z=2.6
• Red, redder, reddest: SCUBA-2 imaging of colour-selected \textit{Herschel} sources
• Quantifying the Thermal Sunyaev-Zel'dovich Effect and Excess Millimeter Emission in Quasar Environments
• The GADOT Galaxy Survey: Dense Gas and Feedback in Herschel-Selected Starburst Galaxies at Redshifts 2 to 6
• PASSAGES: The Large Millimeter Telescope and ALMA Observations of Extremely Luminous High Redshift Galaxies Identified by the Planck
• Gamma-ray Bursts and the Early Star-formation History
• The "Red Radio Ring": Ionised and Molecular Gas in a Starburst/Active Galactic Nucleus at $z\sim 2.55$
• The Rest-Frame Submillimeter Spectrum of High Redshift, Dusty, Star-Forming Galaxies from the SPT-SZ Survey
• Optimizing measurements of cluster velocities and temperatures for CCAT-prime and future surveys
• Herschel and Hubble study of a lensed massive dusty starbursting galaxy at $z\sim 3$
• Spitzer catalog of Herschel-selected ultrared dusty, star-forming galaxies
• Downsizing of Star Formation Measured from the Clustered Infrared Background Correlated with Quasars
• The Atacama Cosmology Telescope: CO(J = 3 - 2) mapping and lens modeling of an ACT-selected dusty star-forming galaxy
• [NII] fine-structure emission at 122 and 205um in a galaxy at z=2.6: a globally dense star-forming interstellar medium
• Massive molecular gas reservoir in a luminous sub-millimeter galaxy during cosmic noon
• Ammonia in the interstellar medium of a starbursting disc at z=2.6
• Multiwavelength characterisation of an ACT-selected, lensed dusty star-forming galaxy at z=2.64
• The LABOCA/ACT Survey of Clusters at All Redshifts: multi-wavelength analysis of background submillimeter galaxies
• Infrared galaxies detected by the Atacama Cosmology Telescope
• Tight correlation of star formation with [Ci] and CO lines across cosmic time
• Extragalactic astrophysics with next-generation CMB experiments
• The Atacama Cosmology Telescope: Extragalactic Point Sources in the Southern Surveys at 150, 220 and 280 GHz observed between 2008-2010