Open Access
Table A.1.
Model parameter priors used, with some values rounded.
| Object | Component | Parameter | Distribution | Initial Position | Step Size ([1σ]) |
|---|---|---|---|---|---|
| θE, PEMD | N(0.879, 0.133) | 0.879 | 0.133 | ||
| Mass: PEMD |
γPEMD | U(1.5, 2.5) | 1.95 | 0.02 | |
| (e1, e2) | N(0, 0.2) | (-0.047, 0.107) | 0.2 | ||
| (x, y) | U(−3, 3) | (-0.031, 0.021) | 0.003 | ||
| Main Deflector (D) z = 0.6575 |
Rsersic | U(0.001, 5) | 0.296 | 0.01 | |
| Light: Bulge Sérsic |
nsersic | Fixed | 4 | ||
| (e1, e2) | U(−0.2, 0.2) | (-0.048, 0.089) | 0.1 | ||
| (x, y) | U(−1, 1) | (-0.009, 0.009) | 0.003 | ||
| Light: Disk Sérsic |
Rsersic | U(0.001, 5) | 1.752 | 0.05 | |
| nsersic | Fixed | 1 | |||
| (e1, e2) | U(−0.5, 0.5) | (-0.164, 0.154) | 0.1 | ||
| (x, y) | Joined with Bulge Sérsic | ||||
| γext, 1 | U(−0.5, 0.5) | 0.109 | 0.1 | ||
| External Shear z = 0.6575 |
Mass: Shear |
γext, 2 | U(−0.5, 0.5) | 0.025 | 0.1 |
| (x, y) | Fixed | 0 | |||
| Mass: SIS |
θE, X | U(0.0001, 0.25) | 0.15 | 0.01 | |
| Satellite (X) z = 0.6575 |
γext, 2 | U(−0.5, 0.5) | 0.025 | 0.1 | |
| (x, y) | Joined with Light | ||||
| Rsersic | U(0.0001, 0.1) | 0.044 | 0.01 | ||
| Light: Sérsic |
nsersic | U(1, 10) | 2 | 0.2 | |
| (e1, e2) | Fixed | (0.015, 0.018) | |||
| (x, y) | U(Initial ± 0.07) | (0.228, 2.046) | 0.003 | ||
| Mass: SIS |
θE, G2 | N(0.622, 0.062) | 0.622 | 0.1 | |
| (x, y) | Joined with Light | ||||
| Galaxy G2 z = 0.7450 |
Light: Sérsic |
Rsersic | U(0.001, 5) | 1 | 0.05 |
| nsersic | U(0.1, 2) | 0.5 | 0.1 | ||
| (e1, e2) | Fixed | (0, 0) | |||
| (x, y) | Fixed | (-3.998, -0.034) | |||
| Galaxy G3 | Mass: | θE, G3 | N(0.088, 0.048)‡ | ||
| z = 0.6575 | SIS | (x, y) | Fixed | (2.823, 7.006) | |
| Galaxy G7 | Mass: | θE, G7 | N(0.388, 0.030)‡ | ||
| z = 0.6575 | SIS | (x, y) | Fixed | (-4.578, -11.719) | |
| Free Flexion | Mass: | (g1, g2, g3, g4) | U(−0.1, 0.1) | 0 | 0.01 |
| z = 0.6575 | Flexion | (x, y) | Fixed | (0, 0) | |
| A1(x, y) | U(Initial ± 0.3) | (-0.760, 0.958) | 0.007 | ||
| Quasar Images z = 0.6575 |
Light: Point Sources |
A2(x, y) | U(Initial ± 0.3) | (-0.050, 1.076) | 0.007 |
| B(x, y) | U(Initial ± 0.3) | (1.434, -0.302) | 0.007 | ||
| C(x, y) | U(Initial ± 0.3) | (-0.686, -0.579) | 0.007 | ||
| Rsersic | U(0.04, 0.3) | 0.2 | 0.01 | ||
| Light: Sérsic |
nsersic | U(0.15, 4) | 1 | 0.25 | |
| (e1, e2) | U(−0.15, 0.15) | (0, 0) | 0.03 | ||
| Quasar Host Galaxy z = 1.662 |
(x, y) | U(Initial ± 1) | (-0.45, 0.1) | 0.03 | |
| Light: | β | U(0.031, 0.3) | 0.031 | 0.025 | |
| Shapelets | nmax | Fixed | {18, 20, 22} | 0.1 | |
| (x, y) | Joined with Sérsic | ||||
Notes. Parameters grouped by components (Deflector, Sérsic 1, Shapelets) with their corresponding types (Mass or Light). The bounds are represented as uniform distributions, with initial guesses and sampling step sizes ([σ]).
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