SHALOS: Statistical Herschel-ATLAS Lensed Objects Selection

Abstract

The statistical analysis of large sample of strong lensing events can be a powerful tool to extract astrophysical and/or cosmological valuable information. However, the number of such events is still relatively low, mostly because of the lengthily observational validation process on individual events. In this work we propose a new methodology with a statistical selection approach in order to increase by a factor of $\sim 5$ the number of such events. Although the methodology can be applied to address several selection problems, it has particular benefits in the case of the identification of strongly lensed galaxies: objectivity, minimal initial constrains in the main parameter space, preservation of the statistical properties. The proposed methodology is based on the Bhattacharyya distance as a measure of the similarity between probability distributions of properties of two different cross-matched galaxies. The particular implementation for the aim of this work is called SHALOS and it combines the information of four different properties of the pair of galaxies: angular separation, luminosity percentile, redshift and optical/sub-mm flux density ratio. The SHALOS method provided a ranked list of strongly lensed galaxies. The number of candidates for the final associated probability, $P_{tot}>0.7$, is 447 with an estimated mean amplification factor of 3.12 for an halo with a typical cluster mass. Additional statistical properties of the SHALOS candidates, as the correlation function or the source number counts, are in agreement with previous results indicating the statistical lensing nature of the selected sample.

9 pages, 6 figures, submitted to Astronomy & Astrophysics

References in corpus (56)

• Astropy: A Community Python Package for Astronomy
• The Structure of Cold Dark Matter Halos
• The Seventh Data Release of the Sloan Digital Sky Survey
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Halo Models of Large Scale Structure
• Constraints on the relationship between stellar mass and halo mass at low and high redshift
• A Physical Model for the Co-evolution of QSOs and of their Spheroidal Hosts
• The Herschel Multi-tiered Extragalactic Survey: HerMES
• The 10 Meter South Pole Telescope
• Halo concentrations in the standard LCDM cosmology
• The Herschel ATLAS
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- II. Submillimetre maps, catalogue and number counts
• Intense Star Formation within Resolved Compact Regions in a Galaxy at z=2.3
• New Relationships between Galaxy Properties and Host Halo Mass, and the Role of Feedbacks in Galaxy Formation
• Early-type galaxies in the SDSS. II. Correlations between observables
• Astrophysical and Cosmological Information from Large-scale sub-mm Surveys of Extragalactic Sources
• 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
• Herschel and SCUBA-2 imaging and spectroscopy of a bright, lensed submillimetre galaxy at z = 2.3
• The Herschel-ATLAS Data Release 1 Paper I: Maps, Catalogues and Number Counts
• Herschel-ATLAS Galaxy Counts and High Redshift Luminosity Functions: The Formation of Massive Early Type Galaxies
• HerMES: Candidate Gravitationally Lensed Galaxies and Lensing Statistics at Submillimeter Wavelengths
• Herschel-ATLAS: Multi-wavelength SEDs and physical properties of 250 micron-selected galaxies at z < 0.5
• The Herschel-ATLAS: a sample of 500μm-selected lensed galaxies over 600 square degrees
• Probabilistic Cross-Identification of Astronomical Sources
• 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
• Herschel-ATLAS: First data release of the Science Demonstration Phase source catalogues
• Herschel-ATLAS: counterparts from the UV--NIR in the science demonstration phase catalogue
• The space density of luminous dusty star-forming galaxies at $z>4$: SCUBA-2 and LABOCA imaging of ultrared galaxies from $Herschel$-ATLAS
• Planck's Dusty GEMS: Gravitationally lensed high-redshift galaxies discovered with the Planck survey
• A Comprehensive View of a Strongly Lensed Planck-Associated Submillimeter Galaxy
• The first release of data from the Herschel ATLAS: the SPIRE images
• H-ATLAS: PACS imaging for the Science Demonstration Phase
• The Herschel-ATLAS Data Release 1 Paper II: Multi-wavelength counterparts to submillimetre sources
• Herschel-ATLAS: towards a sample of ~1000 strongly-lensed galaxies
• Candidate Gravitationally Lensed Dusty Star-forming Galaxies in the Herschel Wide Area Surveys
• Early Science with the Large Millimeter Telescope: Observations of Extremely Luminous High-z Sources Identified by Planck
• Effective Models for Statistical Studies of Galaxy-Scale Gravitational Lensing
• 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
• H-ATLAS: estimating redshifts of Herschel sources from sub-mm fluxes
• 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
• Lens Models of Herschel-Selected Galaxies From High-Resolution Near-IR Observations
• Herschel-ATLAS and ALMA: HATLAS J142935.3-002836, a lensed major merger at redshift 1.027
• The differential magnification of high-redshift ultraluminous infrared galaxies
• The Herschel-ATLAS Data Release 2 Paper II: Catalogues of far-infrared and submillimetre sources in the fields at the south and north Galactic Poles
• Herschel-ATLAS: VISTA VIKING near-IR counterparts in the Phase 1 GAMA 9h data
• Herschel-ATLAS/GAMA: SDSS cross-correlation induced by weak lensing
• H-ATLAS/GAMA: Magnification Bias Tomography. Astrophysical constraints above $\sim 1$ arcmin
• Colour matters: the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS
• The second Herschel-ATLAS Data Release - III: optical and near-infrared counterparts in the North Galactic Plane field
• Herschel-ATLAS : The spatial clustering of low and high redshift submillimetre galaxies
• Probabilistic Cross-Identification of Cosmic Events

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• Giant star-forming clumps?
• The Bright Extragalactic ALMA Redshift Survey (BEARS) II: Millimetre photometry of gravitational lens candidates
• A search for the lenses in the Herschel Bright Sources (HerBS) Sample
• IRAM 30m-EMIR Redshift Search of z = 3-4 Lensed Dusty Starbursts selected from the HerBS sample
• Cosmological constraints with the sub-millimetre galaxies Magnification Bias after large scale bias corrections
• Cosmology with the submillimetre galaxies magnification bias: Proof of concept
• Herschel-ATLAS Data Release III: Near-infrared counterparts in the South Galactic Pole field -- Another 100,000 submillimetre galaxies
• A search for candidate strongly-lensed dusty galaxies in the Planck satellite catalogues
• The eROSITA Final Equatorial-Depth Survey (eFEDS): An X-ray bright, extremely luminous infrared galaxy at z = 1.87