Open Access
Table 1
Summary of free, fixed, and derived parameters in the modelling.
| Free | Fixed | Derived | Initial value | Bounds | Unit | Description | |
|---|---|---|---|---|---|---|---|
| єı | ✓ | 0 | |є| < 1 | First component of ellipticity in the tangent plane to (-a, δ) as defined in Eq. (13) | |||
| єշ | ✓ | 0 | |є| < 1 | Second component of ellipticity in the tangent plane to (-a, δ) as defined in Eq. (13) | |||
| re | ✓ | 0.3 | [0, 2] | arcsec | Effective radius: disc scale length as defined in Eq. (13) | ||
| Δα | ✓ | 0 | [−0.3, 0.3] | arcsec | Offset in right ascension as a phase prefactor in Eq. (15) | ||
| Δδ | ✓ | 0 | [−0.3, 0.3] | arcsec | Offset in declination as a phase prefactor in Eq. (15) | ||
| α | ✓ | degree | Right ascension | ||||
| δ | ✓ | degree | Declination | ||||
| Fd | ✓ | Fd ≥ 0 | Disc flux: marginalised over or free as defined in Eq. (16) | ||||
| Fb | ✓ | Fb ≥ 0 | Bulge flux: marginalised over or free as defined in Eq. (16) | ||||
| F | ✓ | F>0 | Total flux | ||||
| B/T | ✓ | [0, 1] | Bulge fraction as defined in text after Eq. (16) | ||||
| S/N | ✓ | S/N ≥ 0 | Signal-to-noise ratio | ||||
| IE | ✓ | Magnitude: depends on the assumed zero-point, exposure gain and integration time | |||||
| nb | ✓ | 1 | Sérsic index of the bulge as defined in Eq. (12) | ||||
| ab | ✓ | depends on nb | Sérsic coefficient of the bulge as defined in Eq. (12), see Peng et al. (2002) | ||||
| rh/ re | ✓ | 0.15 | Bulge half-light radius to effective radius ratio as defined in text after Eq. (12), see Welikala et al., in prep. | ||||
| rmax /re | ✓ | 4.5 | Truncation radius to effective radius ratio as defined in text after Eq. (12) |
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