The Bright Extragalactic ALMA Redshift Survey (BEARS) I: redshifts of bright gravitationally-lensed galaxies from the Herschel ATLAS

Abstract

We present spectroscopic measurements for 71 galaxies associated with 62 of the brightest high-redshift submillimeter sources from the Southern fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), while targeting 85 sources which resolved into 142. We have obtained robust redshift measurements for all sources using the 12-m Array and an efficient tuning of ALMA to optimise its use as a redshift hunter, with 73 per cent of the sources having a robust redshift identification. Nine of these redshift identifications also rely on observations from the Atacama Compact Array. The spectroscopic redshifts span a range $1.41<z<4.53$ with a mean value of 2.75, and the CO emission line full-width at half-maxima range between $110\mathrm{km}{\mathrm{s}}^{-1}<\mathrm{FWHM}<1290\mathrm{km}{\mathrm{s}}^{-1}$ with a mean value of $\sim$ 500kms${}^{-1}$, in line with other high-$z$ samples. The derived CO(1-0) luminosity is significantly elevated relative to line-width to CO(1-0) luminosity scaling relation, which is suggestive of lensing magnification across our sources. In fact, the distribution of magnification factors inferred from the CO equivalent widths is consistent with expectations from galaxy-galaxy lensing models, though there is a hint of an excess at large magnifications that may be attributable to the additional lensing optical depth from galaxy groups or clusters.

21 pages, 8 figures

References in corpus (30)

• Array Programming with NumPy
• Cosmic Star Formation History
• The Resolved Properties of Extragalactic Giant Molecular Clouds
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• Intense Star Formation within Resolved Compact Regions in a Galaxy at z=2.3
• Galaxy growth in a massive halo in the first billion years of cosmic history
• High-redshift star formation in the ALMA era
• An excess of small-scale gravitational lenses observed in galaxy clusters
• First catalog of strong lens candidates in the COSMOS field
• 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
• Molecular gas in the Herschel-selected strongly lensed submillimeter galaxies at z~2-4 as probed by multi-J CO lines
• The Complete Redshift Distribution of Dusty Star-forming Galaxies from the SPT-SZ Survey
• RingFinder: automated detection of galaxy-scale gravitational lenses in ground-based multi-filter imaging data
• The space density of luminous dusty star-forming galaxies at $z>4$: SCUBA-2 and LABOCA imaging of ultrared galaxies from $Herschel$-ATLAS
• Turbulent Gas in Lensed Planck-selected Starbursts at redshifts 1-3.5
• Gravitational lenses and lens candidates identified from the COSMOS field
• The Herschel-ATLAS Data Release 2, Paper I. Submillimeter and Far-infrared Images of the South and North Galactic Poles: The Largest Herschel Survey of the Extragalactic Sky
• The Herschel Bright Sources (HerBS): Sample definition and SCUBA-2 observations
• NOEMA redshift measurements of bright Herschel galaxies
• CO, H2O, H2O+ line and dust emission in a z = 3.63 strongly lensed starburst merger at sub-kiloparsec scales
• Giant star-forming clumps?
• Up to 100,000 reliable strong gravitational lenses in future dark energy experiments
• Close-up view of a luminous star-forming galaxy at z=2.95
• A search for the lenses in the Herschel Bright Sources (HerBS) Sample
• Predictions for Strong Lens Detections with the Nancy Grace Roman Space Telescope
• IRAM 30m-EMIR Redshift Search of z = 3-4 Lensed Dusty Starbursts selected from the HerBS sample
• The galaxy-galaxy strong lensing cross-sections of simulated LCDM galaxy clusters
• The second Herschel-ATLAS Data Release - III: optical and near-infrared counterparts in the North Galactic Plane field
• Over-density of SMGs in fields containing z~0.3 galaxies: magnification bias and the implications for studies of galaxy evolution

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• z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [I] Overview
• z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [II] Dust properties
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• The Rest-Frame Submillimeter Spectrum of High Redshift, Dusty, Star-Forming Galaxies from the SPT-SZ Survey
• Resolved CO(1-0) emission and gas properties in luminous dusty star forming galaxies at z=2-4
• A large population of strongly lensed faint submillimetre galaxies in future dark energy surveys inferred from JWST imaging
• A kiloparsec-scale ordered magnetic field in a galaxy at z=5.6
• Ionized Carbon in Galaxies: The [C II] 158 $\mu$m Line as a Total Molecular Gas Mass Tracer Revisited
• Interpreting the statistical properties of high-z extragalactic sources detected by the South Pole Telescope survey
• JWSTs PEARLS: NIRCam imaging and NIRISS spectroscopy of a $z=3.6$ star-forming galaxy lensed into a near-Einstein Ring by a $z=1.258$ massive elliptical galaxy
• Vz-GAL: Probing Cold Molecular Gas in Dusty Star-forming Galaxies at z=1-6
• An upper limit to differential magnification effects in strongly gravitationally lensed galaxies
• Hiding behind a curtain of dust: Gas and dust properties of an ultra-luminous strongly-lensed z = 3.75 galaxy behind the Milky Way disk
• The Photometric Analysis of the Environment Around Two Dusty Star-Forming Galaxies at $z\sim 2$
• The ViSta method for stacking in the Fourier domain and its application to the dusty star-forming galaxies in the ALMA Science Archive