Fast and accurate mock catalogue generation for low-mass galaxies

Jun Koda, Chris Blake, Florian Beutler, Eyal Kazin, Felipe Marin

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Abstract

We present an accurate and fast framework for generating mock catalogues including low-mass haloes, 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 realizations. We show that COLA simulations can produce accurate mock catalogues with a moderate computation resource for low- to intermediate-mass galaxies in 1012 M⊙ 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−1, and with only 3-per cent error for k ≤ 0.2 h Mpc−1. 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.
Original languageEnglish
Pages (from-to)2118-2129
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume459
Issue number2
Early online date5 Apr 2016
DOIs
Publication statusPublished - 21 Jun 2016

Keywords

  • astro-ph.CO
  • methods: numerical
  • cosmology: theory
  • large-scale structure of Universe

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