2.9 KiB
2.9 KiB
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Text catalog format
It is determined by the function loadGalaxySurveyFromText in libLSS/data/survey_load_txt.hpp (ARES git tree)
[Galaxy Survey]
For galaxy survey, the standard catalog format includes 7-8 columns. The meaning of each column, from left to right, is listed below.
- galaxy id
- phi: longitude, 2π > = ϕ > = 0 [rad].
- theta: latitude, π ⁄ 2 > = θ > = − π ⁄ 2 [rad].
- zo: total observed redshift, to be used with photo-z.
- m: apparent magnitude.
- M_abs: absolute magnitude, not really used as it is derived from other quantities.
- z: redshift, used to position the galaxies, cosmology is used to transform this to comoving distance at the moment.
- w: weight, used as a multiplier when creating the grid of galaxy distribution.
[Dark Matter Simulation]
For Dark Matter simulation, the standard catalog format includes 10 columns. The meaning of each column, from left to right, is listed below.
- halo id
- halo mass: given in unit of solar mass
- halo radius
- halo spin
- x, y, z: comoving coordinates
- vz, vy, vz: velocities