CSST large-scale structure analysis pipeline: I. constructing reference mock galaxy redshift surveys
Monthly Notices of the Royal Astronomical Society(2024)
摘要
In this paper, we set out to construct a set of reference mock galaxy
redshift surveys (MGRSs) for the future Chinese Space-station Survey Telescope
(CSST) observation, where subsequent survey selection effects can be added and
evaluated. This set of MGRSs is generated using the dark matter subhalos
extracted from a high-resolution Jiutian N-body simulation of the standard
ΛCDM cosmogony with Ω_m=0.3111, Ω_Λ=0.6889, and
σ_8=0.8102. The simulation has a boxsize of 1 h^-1 Gpc, and
consists of 6144^3 particles with mass resolution 3.723 × 10^8 h^-1
M_⊙. In order to take into account the effect of redshift evolution, we
first use all 128 snapshots in the Jiutian simulation to generate a light-cone
halo/subhalo catalog. Next, galaxy luminosities are assigned to the main and
subhalo populations using the subhalo abundance matching (SHAM) method with the
DESI z-band luminosity functions at different redshifts. Multi-band
photometries, as well as images, are then assigned to each mock galaxy using a
3-dimensional parameter space nearest neighbor sampling of the DESI LS
observational galaxies and groups. Finally, the CSST and DESI LS survey
geometry and magnitude limit cuts are applied to generate the required MGRSs.
As we have checked, this set of MGRSs can generally reproduce the observed
galaxy luminosity/mass functions within 0.1 dex for galaxies with L > 10^8
L_⊙ (or M_* > 10^8.5 M_⊙) and within 1-σ level for galaxies
with L < 10^8L_⊙ (or M_* < 10^8.5 M_⊙). Together with the CSST
slitless spectra and redshifts for our DESI LS seed galaxies that are under
construction, we will set out to test various slitless observational selection
effects in subsequent probes.
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