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Table 1.
Definition of features and targets.
| Training/Testing features | ||
|---|---|---|
| Parameter | Description | Unit |
| g | TNG: 3D SDSS g-band (λ = 469 nm) | mag |
| OBS: total 2D g-band magnitude (λ = 469 nm) | mag | |
| r | TNG: 3D SDSS r-band (λ = 617 nm) of all stellar particles | mag |
| OBS: total 2D r-band magnitude (λ = 617 nm) | mag | |
| r1/2 | TNG: 3D radius containing the half of the stellar mass particles | kpc |
| OBS: 3D radius from modeling of the galaxy light density profiles | kpc | |
| M⋆ | TNG: 3D Sum of masses of all stellar particles of a galaxy, using Chabrier IMF | M⊙ |
| OBS: 3D total stellar mass from stellar population models, using Chabrier IMF | M⊙ | |
| σ | TNG: 1D velocity dispersion of all the member particles (3D dispersion divided by  ) |
km s−1 |
| OBS: line-of-sight velocity dispersion: within the fiber or (aperture corrected) at r1/2 | km s−1 | |
| Accessory features | ||
| Parameter | Description | Unit |
| M⋆(r1/2) | TNG: Sum of masses of stellar particles within the stellar half-mass radius, i.e., M⋆(r1/2) = M⋆/2 | M⊙ |
| OBS: Stellar mass inside the 3D half-light radius | M⊙ | |
| Mg(r1/2) | TNG: Sum of masses of gas particles within the stellar half-mass radius | M⊙ |
| Targets | ||
| Parameter | Description | Unit |
| Mtot(r1/2) | TNG: 3D total mass as the sum of masses of all the particle within stellar half-mass radius | M⊙ |
| Mdyn(r1/2) | OBS: 3D total mass inside r1/2 derived from (Jeans) dynamical analysis | M⊙ |
| MDM(r1/2) | TNG: 3D total mass as the sum of masses of all DM particle within stellar half-mass radius | M⊙ |
| OBS: MDM(r1/2)=Mtot(r1/2)-M⋆(r1/2) – unless gas mass, Mg(r1/2), is measured | M⊙ | |
Notes. The differences in physical quantities between the TNG100 simulation (TNG) and observations (OBS) are shown face-to-face.
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