Table 1
Parameters of the lens inferred from two optimisations.
| Model | δ(x) | δ(y) | e | θ | σ0 (km s-1) | RMS | χ 2 | log(Evidence) | Prior |
|
|
|||||||||
| 1 Lens | −0.24 ± 0.12 | −0.02 ± 0.10 |
|
17.9 ± 1.6 | 476 ± 7 | 0.38″ | 86/3 | −62 | e < 0.6 |
|
|
|||||||||
| Ext. Perturb. | 0.01 ± 0.05 | −0.26 ± 0.08 | 0.499 ± 0.04 | 21.5 ± 0.9 | 447 ± 3 | 0.05″ | 0.96 | −20 | e < 0.6 |
Notes. First line: a single halo models the lens potential. Second line: we add an external mass perturbation on top of the halo lens potential. Coordinates are given in arcseconds with respect to the centre of the galaxy deflector. e is the central halo ellipticity. Error bars correspond to 1σ confidence levels.
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