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Table 1
Halo properties at z = 0 extracted from AHF and utilized within this study to train the RF regressor.
| Property | Description | Units |
|---|---|---|
| Mgas | The gas mass within the halo radius R200c. | h−1 M⊙ |
| M* | The stellar mass within the halo radius R200c. | h−1 M⊙ |
| M200c | The halo overdensity mass. | h−1 M⊙ |
| Nsub | The number of sub-structures within a halo. | - |
| Φ0 | The potential corresponding to the integration constant that needs to be evaluated within AHF to remove gravitationally unbounded particles from the identified halos. | (km/s)2 |
| R200c | The halo overdenisty radius. | h−1 kpc |
| Vmax | The maximum circular velocity of the halo which is determined from the rotation curve considering both the dark matter and baryonic particles within the halo. | km/s |
| b | The ratio between the second largest (b) and the largest (a) eigenvalue of the moment of inertia tensor. | b/a |
| c | The ratio between the smallest (c) and the largest eigenvalue of the moment of inertia tensor. | c/a |
| cNFW | The dimensionless concentration parameter which characterizes the Navarro-Frenk-White (NFW, Navarro et al. (1997) density profile for a dark matter halo. Here, we employ a simpler version to estimate the halo concentration using the velocity ratio described in Prada et al. (2012). | - |
| com_offset | The distance between the center of mass of the halo and its density peak which is used as an indicator to describe the halo’s dynamical state (see Cui et al. (2016); Haggar et al. (2020) for example). | h−1 kpc |
| λ | Spin measure of the halo based on Bullock et al. (2001) definition. | - |
| mean Zgas | Mean gas metallicity. | Z⊙ |
| mean Z* | Mean stellar metallicity. | Z⊙ |
| σV | The 3D velocity dispersion for all the particles inside the halo. | km/s |
| Vesc | The escape velocity at R200c. | km/s |
| Ekin | Total kinetic energy of the halo. | h−1 M⊙ (km/s)2 |
| Epot | Total potential energy of the halo. | h−1 M⊙ (km/s)2 |
| Esurf | Surface pressure at the boundary of the halo due to collisionless particles (Shaw et al. 2006). | h−1 M⊙ (km/s)2 |
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