The halo light-cone catalogues of ABACUSSUMMIT

We describe a method for generating halo catalogues on the light-cone using the AbacusSummit suite of N-body simulations. The main application of these catalogues is the construction of realistic mock galaxy catalogues and weak lensing maps on the sky. Our algorithm associates the haloes from a set of coarsely spaced snapshots with their positions at the time of light-cone crossing by matching halo particles to on-the-fly light-cone particles. It then records the halo and particle information into an easily accessible product, which we call the AbacusSummit halo light-cone catalogues. Our recommended use of this product is in the halo mass regime of M-halo > 2.1 x 10(11)M(circle dot) h(-1) for the base resolution simulations, i.e. haloes containing at least 100 particles, where the interpolated halo properties are most reliable. To test the validity of the obtained catalogues, we perform various visual inspections and consistency checks. In particular, we construct galaxy mock catalogues of emission-line galaxies (ELGs) at z similar to 1 by adopting a modified version of the AbacusHOD script, which builds on the standard halo occupation distribution (HOD) method by including various extensions. We find that the multipoles of the autocorrelation function are consistent with the predictions from the full-box snapshot, implicitly validating our algorithm. In addition, we compute and output CMB convergence maps and find that the auto- and cross-power spectrum agrees with the theoretical prediction at the sub-per-cent level.

Automated summary

The study presents a method to generate halo catalogues on the light-cone using AbacusSummit suite, with the main application being the construction of realistic mock galaxy catalogues and weak lensing maps. By associating haloes from snapshots with their positions at the time of light-cone crossing, the algorithm records information into the easily accessible AbacusSummit halo light-cone catalogues, recommended for use in a specific halo mass regime. Various visual inspections and consistency checks validate the obtained catalogues, with autocorrelation function multipoles consistent with predictions and CMB convergence maps showing agreement with theoretical predictions.