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SARCS strong-lensing galaxy groups: I. Optical, weak lensing, and scaling laws

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Autor Foex G.
Autor Motta V.
Autor Limousin M.
Autor Verdugo T.
Autor More A.
Autor Cabanac R.
Autor Gavazzi R.
Autor Munoz R.P.
Fecha Ingreso 2014-04-05T00:18:47Z
Fecha Disponible 2014-04-05T00:18:47Z
Fecha en Repositorio 2014-04-04
dc.identifier 10.1051/0004-6361/201321112
dc.description.abstract We present the weak-lensing and optical analysis of the SL2S-ARCS (SARCS) sample of strong-lensing candidates. The sample is based on the Strong Lensing Legacy Survey (SL2S), a systematic search of strong-lensing systems in the photometric Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). The SARCS sample focusses on arc-like features and is designed to contain mostly galaxy groups. We briefly present the weak-lensing methodology that we used to estimate the mass of the SARCS objects. Among 126 candidates, we obtained a weak-lensing detection (at the 1σ level) for 89 objects with velocity dispersions of the singular isothermal sphere mass model (SIS) ranging from σSIS ~ 350 km s-1 to ~1000 km s-1 with an average value of σSIS ~ 600 km s-1, corresponding to a rich galaxy group (or poor cluster). From the galaxies belonging to the bright end of the group's red sequence (Mi <-21), we derived the optical properties of the SARCS candidates. We obtained typical richnesses of N ~ 5-15 galaxies and optical luminosities of L ~ 0.5-1.5 × 1012 L⊙ (within a radius of 0.5 Mpc). We used these galaxies to compute luminosity density maps, from which a morphological classification reveals that a large fraction of the sample (~45%) are groups with a complex light distribution, either elliptical or multi-modal, suggesting that these objects are dynamically young structures. We finally combined the lensing and optical analyses to define a sample of the 80 most secure group candidates, i.e. weak-lensing detection and over-density at the lens position in the luminosity map, to remove false detections and galaxy-scale systems from the initial sample. We use this reduced sample to probe the optical scaling relations in combination with a sample of massive galaxy clusters. We detect the expected correlations over the probed range in mass with a typical scatter of ~25% in σSIS at a given richness or luminosity, making these scaling laws interesting mass proxies. © 2013 ESO. en_US
dc.source Astronomy and Astrophysics
Link Descarga dc.source.uri
Title dc.title SARCS strong-lensing galaxy groups: I. Optical, weak lensing, and scaling laws en_US
Tipo dc.type Article
dc.description.keywords Cosmology: observation; Dark matter; Galaxies: groups: generals; Gravitational lensing: weak; Isothermal spheres; Morphological classifications; Systematic searches; Velocity dispersion; Legacy systems; Lenses; Luminance; Surveys; Galaxies en_US

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