Journal
ASTROPHYSICAL JOURNAL
Volume 761, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0004-637X/761/2/170
Keywords
galaxies: fundamental parameters; gravitational lensing: strong
Categories
Funding
- Centre National des Etudes Spatiales
- TABASGO foundation
- NSF [NSF-0642621]
- Packard Foundation through a Packard Fellowship
- NASA through Hubble Space Telescope programs [GO-10876, GO-11289, GO-11588]
- National Science Foundation [PHY99-07949]
- NASA [NAS 5-26555]
- W.M. Keck Foundation
- W.M. Keck Observatory
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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 = 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.
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