# Data Fields of the GAEA SAM Outputs and Starduster Magnitudes
### The data is stored in the ['Galaxies'] dataset in each HDF5 file.

| Field                    | Unit              | Description |
| :----------------------- | :---------------- | :---------- |
| **GalID**                | —                 | The unique ID of the galaxy in the simulation, identical to the `TrackId` field in the HBT tables. |
| **SinkGalID**            | —                 | The unique ID of the galaxy that the current galaxy will merge into. |
| **Type**                 | —                 | Galaxy type: `0` = Central, `1` = Satellite (with subhalo), `2` = Satellite (without subhalo) in a FoF group. |
| **HaloIndex**            | —                 | The index of the host subhalo in the subvolume HBT catalog. |
| **FirstHaloInFOFgroup**  | —                 | The index of the main subhalo in a FoF group halo catalog. |
| **CentralGal**           | —                 | The index of the central galaxy in the subvolume. |
| **SnapNum**              | —                 | The snapshot number. |
| **CentralMvir**          | 10<sup>10</sup> M<sub>⊙</sub>/h        | The M<sub>200c</sub> of the central subhalo, corresponding to the `BoundM200Crit` field of the central subhalo in the same FoF group in the HBT table. |
| **GasSpin**              | Mpc/h · km/s      | The spin of the cold gas disk. |
| **StellarSpin**          | Mpc/h · km/s      | The spin of the stellar disk. |
| **Pos**                  | Mpc/h             | The subhalo position in comoving coordinates. |
| **Vel**                  | km/s              | The physical velocity of the subhalo. |
| **Len**                  | —                 | The number of bound particles of the host subhalo. |
| **Mvir**                 | 10<sup>10</sup> M<sub>⊙</sub>/h         | The M<sub>200c</sub> of the subhalo for centrals (Type=0); the `Mbound` of the subhalo for satellites (Type>0). |
| **InfallMvir**           | 10<sup>10</sup> M<sub>⊙</sub>/h        | The latest M<sub>200c</sub> of the subhalo when it was last a central. |
| **Rvir**                 | Mpc/h             | The virial radius of the subhalo the galaxy is/was a center of. |
| **Vvir**                 | km/s              | The virial velocity of the subhalo the galaxy is/was a center of. |
| **Vmax**                 | km/s              | Maximum circular velocity. Corresponds to the `VmaxPhysical` field in the HBT table. |
| **ColdGas**              | 10<sup>10</sup> M<sub>⊙</sub>/h       | The mass in cold gas. |
| **H_mol**                | 10<sup>10</sup> M<sub>⊙</sub>/h        | Total molecular gas mass (fixed composition: 74% H<sub>2</sub>, 26% He/dust/ionized gas). Multiply by 0.74 to get pure H<sub>2</sub> mass. |
| **StellarMass**          | 10<sup>10</sup> M<sub>⊙</sub>/h         | The mass in stars. |
| **BulgeMass**            | 10<sup>10</sup> M<sub>⊙</sub>/h        | The mass in the stellar bulge. |
| **HotGas**               | 10<sup>10</sup> M<sub>⊙</sub>/h        | The mass in hot gas. |
| **EjectedMass**          | 10<sup>10</sup> M<sub>⊙</sub>/h         | The mass of the ejected component. |
| **BlackHoleMass**        | 10<sup>10</sup> M<sub>⊙</sub>/h        | The mass of the central massive black hole. |
| **NMetalsColdGas**       | 10<sup>10</sup> M<sub>⊙</sub>/h         | Vector of metal masses in cold gas: [C+Mg, O, Fe, other metals]. |
| **NMetalsStellarMass**   | 10<sup>10</sup> M<sub>⊙</sub>/h         | Vector of metal masses in stars: [C+Mg, O, Fe, other metals]. |
| **NMetalsBulgeMass**     | 10<sup>10</sup> M<sub>⊙</sub>/h         | Vector of metal masses in stellar bulge: [C+Mg, O, Fe, other metals]. |
| **NMetalsHotGas**        | 10<sup>10</sup> M<sub>⊙</sub>/h         | Vector of metal masses in hot gas: [C+Mg, O, Fe, other metals]. |
| **NMetalsEjectedMass**   | 10<sup>10</sup> M<sub>⊙</sub>/h         | Vector of metal masses in ejected component: [C+Mg, O, Fe, other metals]. |
| **Sfr**                  | M<sub>⊙</sub>/yr             | Star formation rate. |
| **SfrBulge**             | M<sub>⊙</sub>/yr             | Star formation rate in the bulge. |
| **RPradius**             | Mpc/h             | The radius beyond which the cold gas disk is influenced by ram pressure stripping. |
| **SfrRing**              | M<sub>⊙</sub>/yr             | Star formation rates in 21 annuli on the cold gas disk. |
| **Ring**                 | Mpc/h             | Radii of the 21 annuli. |
| **GasRing**              | 10<sup>10</sup> M<sub>⊙</sub>/h         | Masses of cold gas in the 21 annuli. |
| **FmolRing**             | —                 | Fractions of molecular gas in the 21 annuli. |
| **RPRing**               | 10<sup>10</sup> M<sub>⊙</sub>/h        | Masses of cold gas removed by ram-pressure stripping from the 21 annuli. |
| **XrayLum**              | log<sub>10</sub>(erg/s)      | X-Ray luminosity. |
| **GasDiskRadius**        | Mpc/h             | Three times the scale length of the cold gas disk. |
| **StellarDiskRadius**    | Mpc/h             | Three times the scale length of the stellar disk. |
| **BulgeSize**            | Mpc/h             | The half-mass radius of the stellar bulge. |
| **CoolingRadius**        | Mpc/h             | The cooling radius. |
| **csst_nuv_nodust**      | mag               | Intrinsic (no dust) AB magnitude in the CSST NUV band. |
| **csst_u_nodust**        | mag               | Intrinsic (no dust) AB magnitude in the CSST u band. |
| **csst_g_nodust**        | mag               | Intrinsic (no dust) AB magnitude in the CSST g band. |
| **csst_r_nodust**        | mag               | Intrinsic (no dust) AB magnitude in the CSST r band. |
| **csst_i_nodust**        | mag               | Intrinsic (no dust) AB magnitude in the CSST i band. |
| **csst_z_nodust**        | mag               | Intrinsic (no dust) AB magnitude in the CSST z band. |
| **csst_y_nodust**        | mag               | Intrinsic (no dust) AB magnitude in the CSST y band. |
| **wise_w1_nodust**       | mag               | Intrinsic (no dust) AB magnitude in the WISE W1 band. |
| **wise_w2_nodust**       | mag               | Intrinsic (no dust) AB magnitude in the WISE W2 band. |
| **csst_nuv_dust**        | mag               | Dust-applied AB magnitude in the CSST NUV band. |
| **csst_u_dust**          | mag               | Dust-applied AB magnitude in the CSST u band. |
| **csst_g_dust**          | mag               | Dust-applied AB magnitude in the CSST g band. |
| **csst_r_dust**          | mag               | Dust-applied AB magnitude in the CSST r band. |
| **csst_i_dust**          | mag               | Dust-applied AB magnitude in the CSST i band. |
| **csst_z_dust**          | mag               | Dust-applied AB magnitude in the CSST z band. |
| **csst_y_dust**          | mag               | Dust-applied AB magnitude in the CSST y band. |
| **wise_w1_dust**         | mag               | Dust-applied AB magnitude in the WISE W1 band. |
| **wise_w2_dust**         | mag               | Dust-applied AB magnitude in the WISE W2 band. |