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Table 2.
Observational parameters defined in this paper.
| Name | Symbol | Description |
|---|---|---|
| Photometric parameters extracted from images | ||
| Absolute magnitudes | Mr and Mg | r and g band luminosity in the within 30 kpc of the galaxy. |
| Colour | g − r | Mg − Mr. |
| Radii | r50 and r90 | Radius of the galaxy containing 50% and 90% of the r-band luminosity. |
| Concentration | C | C = 5 × log10(r90/r50) |
| Luminosity fraction of inner halo | finnerhalo | Luminosity of inner halo 3.5–10 kpc. |
| Inner surface brightness gradient | ∇ρinner | The luminosity gradient from 1.5 to 10 kpc |
| Inner colour gradient | ∇(g − r)inner | The g − r gradient from 1.5 to 10 kpc |
| Luminosity fraction of outer halo | fouterhalo | Luminosity of outer halo 10–30 kpc. |
| Outer surface brightness gradient | ∇ρouter | The luminosity gradient from 10 to 30 kpc |
| Outer colour gradient | ∇(g − r)outer | The g − r gradient from 10 to 30 kpc |
| Kinematical parameters from single-aperture spectrum | ||
| Velocity dispersion | σv | Extracted from the line-of-sight velocity distribution within 3 arcsec. |
| kurtosis | h4 | Extracted from the line-of-sight velocity distribution within 3 arcsec. |
| Sub0 | Mr, r90, finnerhalo, fouterhalo, ∇ρouter and ∇(g − r)outer | |
| Sub1 | Mr, r90, fouterhalo, ∇ρouter and ∇(g − r)outer | |
Notes. We evaluated the ability of all listed parameters in predicting fexsitu. We only used parameters in Sub0 and Sub1 for our final model construction.
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