Küng, R;
Saha, P;
Ferreras, I;
Baeten, E;
Coles, J;
Cornen, C;
Macmillan, C;
... Wilcox, JK; + view all
(2018)
Models of gravitational lens candidates from SpaceWarps CFHTLS.
Monthly Notices of the Royal Astronomical Society
, 474
(3)
pp. 3700-3713.
10.1093/mnras/stx3012.
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Abstract
We report modelling follow-up of recently discovered gravitational-lens candidates in the Canada France Hawaii Telescope Legacy Survey. Lens modelling was done by a small group of specially interested volunteers from the SpaceWarps citizen-science community who originally found the candidate lenses. Models are categorized according to seven diagnostics indicating (a) the image morphology and how clear or indistinct it is, (b) whether the mass map and synthetic lensed image appear to be plausible, and (c) how the lens-model mass compares with the stellar mass and the abundance-matched halo mass. The lensing masses range from ~10 11 to > 10 13 M ⊙ . Preliminary estimates of the stellar masses show a smaller spread in stellar mass (except for two lenses): a factor of a few below or above ~10 11 M ⊙ . Therefore, we expect the stellar-to-total mass fraction to decline sharply as lensing mass increases. The most massive system with a convincing model is J1434+522 (SW 05). The two low-mass outliers are J0206-095 (SW 19) and J2217+015 (SW 42); if these two are indeed lenses, they probe an interesting regime of very low star formation efficiency. Some improvements to the modelling software (SpaghettiLens), and discussion of strategies regarding scaling to future surveys with more and frequent discoveries, are included.
| Type: | Article |
|---|---|
| Title: | Models of gravitational lens candidates from SpaceWarps CFHTLS |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx3012 |
| Publisher version: | https://doi.org/10.1093/mnras/stx3012 |
| Language: | English |
| Additional information: | This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing: strong, galaxies: general, galaxies: stellar content, dark matter |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10042059 |
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