AustralieFrV1, Main, Exploration, bibRecord, 005865

THE SL2S GALAXY-SCALE GRAVITATIONAL LENS SAMPLE. I. THE ALIGNMENT OF MASS AND LIGHT IN MASSIVE EARLY-TYPE GALAXIES AT z = 0.2-0.9

Identifieur interne : 005865 ( Main/Exploration ); précédent : 005864; suivant : 005866

THE SL2S GALAXY-SCALE GRAVITATIONAL LENS SAMPLE. I. THE ALIGNMENT OF MASS AND LIGHT IN MASSIVE EARLY-TYPE GALAXIES AT z = 0.2-0.9

Auteurs : Raphaël Gavazzi [France] ; Tommaso Treu [États-Unis] ; Philip J. Marshall [États-Unis, Royaume-Uni] ; Florence Brault [France] ; Andrea Ruff [Australie]

Source :

The Astrophysical journal [ 0004-637X ] ; 2012.

RBID : Pascal:13-0045233

Descripteurs français

Pascal (Inist)
- Galaxies premier type, Lentille gravitationnelle, Alignement, Image multiple, Modèle, Angle position, Distribution masse, Cisaillement, Spectrométrie, Matière sombre, Mirage gravitationnel.
Wicri :
- topic : Spectrométrie.

English descriptors

KwdEn :
- Alignment, Dark matter, Early type galaxies, Gravitational lenses, Gravitational lensing, Mass distribution, Models, Multiple image, Position angle, Shear, Spectroscopy.

Abstract

We study the relative alignment of mass and light in a sample of 16 massive early-type galaxies at z = 0.2-0.9 that act as strong gravitational lenses. The sample was identified from deep multi-band images obtained as part of the Canada-France-Hawaii Telescope Legacy Survey and as part of the Strong Lensing Legacy Survey (SL2S). Higher resolution follow-up imaging is available for a subset of 10 systems. We construct gravitational lens models and infer total enclosed mass, elongation, and position angle of the mass distribution. By comparison with the observed distribution of light we infer that there is a substantial amount of external shear with mean value ?γ_ext? = 0.12 ± 0.05, arising most likely from the environment of the SL2S lenses. In a companion paper, we combine these measurements with follow-up Keck spectroscopy to study the evolution of the stellar and dark matter content of early-type galaxies as a function of cosmic time.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">We study the relative alignment of mass and light in a sample of 16 massive early-type galaxies at z = 0.2-0.9 that act as strong gravitational lenses. The sample was identified from deep multi-band images obtained as part of the Canada-France-Hawaii Telescope Legacy Survey and as part of the Strong Lensing Legacy Survey (SL2S). Higher resolution follow-up imaging is available for a subset of 10 systems. We construct gravitational lens models and infer total enclosed mass, elongation, and position angle of the mass distribution. By comparison with the observed distribution of light we infer that there is a substantial amount of external shear with mean value ?γ<sub>ext</sub>
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THE SL2S GALAXY-SCALE GRAVITATIONAL LENS SAMPLE. I. THE ALIGNMENT OF MASS AND LIGHT IN MASSIVE EARLY-TYPE GALAXIES AT z = 0.2-0.9

THE SL2S GALAXY-SCALE GRAVITATIONAL LENS SAMPLE. I. THE ALIGNMENT OF MASS AND LIGHT IN MASSIVE EARLY-TYPE GALAXIES AT z = 0.2-0.9

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri