Fast and accurate mock catalogue generation for low-mass galaxies
  We present an accurate and fast framework for generating mock catalogues
including low-mass halos, based on an implementation of the COmoving Lagrangian
Acceleration (COLA) technique. Multiple realisations of mock catalogues are
crucial for analyses of large-scale structure, but conventional N-body
simulations are too computationally expensive for the production of thousands
of realisations. We show that COLA simulations can produce accurate mock
catalogues with a moderate computation resource for low- to intermediate- mass
galaxies in $10^{12} M_\odot$ haloes, both in real and redshift space. COLA
simulations have accurate peculiar velocities, without systematic errors in the
velocity power spectra for k < 0.15 h/Mpc, and with only 3-per-cent error for k
< 0.2 h/Mpc. We use COLA with 10 time steps and a Halo Occupation Distribution
to produce 600 mock galaxy catalogues of the WiggleZ Dark Energy Survey. Our
parallelized code for efficient generation of accurate halo catalogues is
publicly available at github.com/junkoda/cola_halo.
