C. Faure
On the contribution of large-scale structure to strong gravitational lensing
Faure, C.; Kneib, J.-P.; Hilbert, S.; Massey, R.; Covone, G.; Finoguenov, A.; Leauthaud, A.; Taylor, J.E.; Pires, S.; Scoville, N.; Koekemoer, A.M.
Authors
J.-P. Kneib
S. Hilbert
Professor Richard Massey r.j.massey@durham.ac.uk
Professor
G. Covone
A. Finoguenov
A. Leauthaud
J.E. Taylor
S. Pires
N. Scoville
A.M. Koekemoer
Abstract
We study the correlation between the locations of galaxy-galaxy strong-lensing candidates and tracers of large-scale structure from both weak lensing (WL) or X-ray emission. The Cosmological Evolution Survey (COSMOS) is a unique data set, combining deep, high resolution and contiguous imaging in which strong lenses have been discovered, plus unparalleled multiwavelength coverage. To help interpret the COSMOS data, we have also produced mock COSMOS strong- and WL observations, based on ray-tracing through the Millennium Simulation. In agreement with the simulations, we find that strongly lensed images with the largest angular separations are found in the densest regions of the COSMOS field. This is explained by a prevalence among the lens population in dense environments of elliptical galaxies with high total-to-stellar mass ratios, which can deflect light through larger angles. However, we also find that the overall fraction of elliptical galaxies with strong gravitational lensing is independent of the local mass density; this observation is not true of the simulations, which predict an increasing fraction of strong lenses in dense environments. The discrepancy may be a real effect, but could also be explained by various limitations of our analysis. For example, our visual search of strong lens systems could be incomplete and suffer from selection bias; the luminosity function of elliptical galaxies may differ between our real and simulated data; or the simplifying assumptions and approximations used in our lensing simulations may be inadequate. Work is therefore ongoing. Automated searches for strong lens systems will be particularly important in better constraining the selection function.
Citation
Faure, C., Kneib, J., Hilbert, S., Massey, R., Covone, G., Finoguenov, A., …Koekemoer, A. (2009). On the contribution of large-scale structure to strong gravitational lensing. Astrophysical Journal, 695(2), 1233-1243. https://doi.org/10.1088/0004-637x/695/2/1233
Journal Article Type | Article |
---|---|
Publication Date | Apr 20, 2009 |
Deposit Date | Mar 21, 2013 |
Publicly Available Date | Feb 11, 2015 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 695 |
Issue | 2 |
Article Number | 1233 |
Pages | 1233-1243 |
DOI | https://doi.org/10.1088/0004-637x/695/2/1233 |
Keywords | Galaxies: abundances, Gravitational lensing, Large-scale structure of universe. |
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Copyright Statement
© 2009. The American Astronomical Society. All rights reserved.
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