Table 2.
Model parameters and their priors.
| Component | Parameter | Description | Prior | Prior range/value |
|---|---|---|---|---|
| xG [″] | x-centroid | Exact | Fixed to best-fit light model | |
| yG [″] | y-centroid | Exact | Fixed to best-fit light model | |
| G1/G2 | q | Axis ratio | Flat | [0.6, 1] |
| (PL/cPL) | ϕ [°] | Position angle | Gaussian | Centered on best-fit light model, σ = 10° |
| θE [″] | Einstein radius | Flat | [0.1″, 1.2″] | |
| rc [″] | Core radius (cPL) | Flat | [0″, 0.4″] | |
| γ | Power-law index | Gaussian | Center: 2.08, σ = 0.04 | |
| xsat [″] | x-centroid | Gaussian | Center: 0.73″, σ = 0.14″ | |
| Satellite | ysat [″] | y-centroid | Gaussian | Center: 2.17″, σ = 0.14″ |
| (rSIS/rNIS) | θE, sat [″] | Einstein radius | Flat | [0.0001″, 1″] |
| rc, sat [″] | Core radius (rNIS) | Flat | [0″, 1″] | |
| External | γext | Strength | Flat | [0, 0.4] |
| Shear | ϕext [°] | Position angle | Flat | [0° ,180°] |
Notes. The mass centroids of G1 and G2 are fixed to the light centroids of G1 and G2 from the best-fit light model, while the position angle of the mass has a Gaussian prior centered on the best-fit light model. The prior on the PL slope follows the SLACS lens sample (Auger et al. 2010; Shajib et al. 2021).
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