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

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Autor dc.contributor.author Foex G.
Autor dc.contributor.author Motta V.
Autor dc.contributor.author Limousin M.
Autor dc.contributor.author Verdugo T.
Autor dc.contributor.author More A.
Autor dc.contributor.author Cabanac R.
Autor dc.contributor.author Gavazzi R.
Autor dc.contributor.author Munoz R.P.
Fecha Ingreso dc.date.accessioned 2014-04-05T00:18:47Z
Fecha Disponible dc.date.available 2014-04-05T00:18:47Z
Fecha en Repositorio dc.date.issued 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 http://www.scopus.com/inward/record.url?eid=2-s2.0-84888239362&partnerID=40&md5=9acbe85acce0dd7d7bb8f9b24e4e9a35
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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