Table 1
Starting parameters, constraints, and DOF used by Galapagos-2.
| Parameter | Starting value | Constraints | Choice for DOF in this work |
|---|---|---|---|
| Position x | median(xSS) | median(xSS) ± 0.5 * re,PB,SS | 1 (constant with λ) |
| xD= xB | |||
| Position y | median(ySS) | median(xSS) ± 0.5 * re,PB,SS | 1 (constant with λ) |
| yD= yB | |||
| Disk magnitude mD | mD = mSS + 0.75 (flux equally split at each λ) | mD,start ± 5 (user defined) | 9 (full freedom) |
| Disk half-light radius re,D | re,D = 1.2 * median(re,SS) > 1 px | re,D ≤ 400 px (user defined) | 1 (constant with λ) |
| re,D > 0.3 px (hard coded) | |||
| Disk Sérsic index nD | n == 1 or nD = median(nSS) < 1.5 | 0.2 ≤ n ≤ 8 (user defined) | 0 (nD == 1) |
| Disk axis ratio qD | qSS | 0.0001 ≤ qD ≤ 1 | 1 (constant with λ) |
| Bulge magnitude mB | mB = mSS + 0.75 (flux equally split at each λ) | mB,start ± 5 (user defined) | 9 (full freedom) |
| Bulge half-light radius re,B | re,B = 0.3 * median(re,SS) > 1 px | re,B ≤ 400 px (user defined) | 1 (constant with λ) |
| re,B > 0.3 px (hard coded) | |||
| Bulge Sérsic index nB | n == 4 or nB = median(nSS) > 1.5 | 0.2 ≤ n ≤ 8 (user defined) | 0 (in case of nB == 4) |
| 1 (constant with λ) | |||
| Bulge axis ratio qB | qSS > 0.6 | 0.0001 ≤ qB ≤ 1 | 1 (constant with λ) |
| Position angle PA | PASS | −180 deg <θ< 180 deg | 1 (constant with λ) |
Notes. This table summarises the starting parameters in Galapagos-2, the constraints, and the choices of DOF used throughout this work, as discussed in detail in Sects. 2.2, 2.3, and 2.4. See Appendix E for changes in newer versions of Galapagos-2. Index ‘PB’indicates that the primary band is used for this parameter, i.e. the r-band value in this study.
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