# Data Fields of the Light-cone Catalogs
### The data is stored in the ['Lightcone'] dataset in each HDF5 file.


| Field                     | Unit                  | Description |
| :------------------------ | :-------------------- | :---------- |
| **trackID**               | —                     | The unique ID of the subhalo in the simulation. |
| **Nbound**                | —                     | The number of self-bound particles of the subhalo. |
| **hosthaloID**            | —                     | The index of the host halo in the FoF catalog. |
| **rank**                  | —                     | The order of subhalo inside its host group, sorted by the mass. |
| **posx**                  | Mpc/h                 | The X-coordinate of the subhalo position in comoving coordinates. (Interpolated) |
| **posy**                  | Mpc/h                 | The Y-coordinate of the subhalo position in comoving coordinates. (Interpolated) |
| **posz**                  | Mpc/h                 | The Z-coordinate of the subhalo position in comoving coordinates. (Interpolated) |
| **velx**                  | km/s                  | The X-component of the subhalo peculiar velocity. (Interpolated) |
| **vely**                  | km/s                  | The Y-component of the subhalo peculiar velocity. (Interpolated) |
| **velz**                  | km/s                  | The Z-component of the subhalo peculiar velocity. (Interpolated) |
| **v_los**                 | km/s                  | The line-of-sight velocity of the subhalo. |
| **shMbound**              | 10<sup>10</sup> M<sub>⊙</sub>/h | The self-bound mass of the subhalo. |
| **d_comoving**            | Mpc/h                 | The comoving distance of the subhalo. |
| **RA_deg**                | degree                | The right ascension of the subhalo in the light-cone, ranging from 0 to 360 degree. |
| **Dec_deg**               | degree                | The declination of the subhalo in the light-cone, ranging from -90 to 90 degree. |
| **vmax**                  | km/s                  | The maximum circular velocity. It corresponds to the `VmaxPhysical` field in the HBT table. |
| **PeakMass**              | 10<sup>10</sup> M<sub>⊙</sub>/h | The maximum bound mass. It corresponds to the `LastMaxMass` field in the HBT table. |
| **PeakVmax**              | km/s                  | The maximum vmax. It corresponds to `LastMaxVmaxPhysical` field in the HBT table. |
| **shBoundM200Crit**       | 10<sup>10</sup> M<sub>⊙</sub>/h | The M<sub>200c</sub> of the subhalo. It corresponds to `BoundM200Crit` field in HBT table. |
| **redshift_true**         | —                     | The TRUE redshift (cosmological redshift) of the subhalo. |
| **redshift_obs**          | —                     | The observed redshift of the subhalo, converted using redshift_true and v_los. |
| **snapNum**               | —                     | The snapshot number of the endpoint of each segment while interpolating. |
| **delta_t**               | —                     | The scaled evolution time between two snapshots, ranging from 0 to 1. This value can be used to do interpolations for other properties if needed. |
| **Type**                  | —                     | The type indicating whether the galaxy is a central (=0), a satellite hosted by a subhalo (=1), or a satellite that has lost its subhalo (=2) in a FOF group. |
| **CentralMvir**           | 10<sup>10</sup> M<sub>⊙</sub>/h | The M<sub>200c</sub> of the central subhalo. It corresponds to the `BoundM200Crit` field in HBT table. |
| **CentralGal**            | —                     | The TrackId of the central galaxy. |
| **csst_nuv_dust**         | mag                   | CSST NUV band AB magnitude with dust. (Interpolated) |
| **csst_u_dust**           | mag                   | CSST u band AB magnitude with dust. (Interpolated) |
| **csst_g_dust**           | mag                   | CSST g band AB magnitude with dust. (Interpolated) |
| **csst_r_dust**           | mag                   | CSST r band AB magnitude with dust. (Interpolated) |
| **csst_i_dust**           | mag                   | CSST i band AB magnitude with dust. (Interpolated) |
| **csst_z_dust**           | mag                   | CSST z band AB magnitude with dust. (Interpolated) |
| **csst_y_dust**           | mag                   | CSST y band AB magnitude with dust. (Interpolated) |
| **wise_w1_dust**          | mag                   | WISE w1 band AB magnitude with dust. (Interpolated) |
| **wise_w2_dust**          | mag                   | WISE w2 band AB magnitude with dust. (Interpolated) |