TY - JOUR
T1 - nIFTy cosmology
T2 - galaxy/halo mock catalogue comparison project on clustering statistics
AU - Chuang, Chia-Hsun
AU - Zhao, Cheng
AU - Prada, Francisco
AU - Munari, Emiliano
AU - Avila, Santiago
AU - Izard, Albert
AU - Kitaura, Francisco-Shu
AU - Manera, Marc
AU - Monaco, Pierluigi
AU - Murray, Steven
AU - Knebe, Alexander
AU - Scoccola, Claudia G.
AU - Yepes, Gustavo
AU - Garcia-Bellido, Juan
AU - Marin, Felipe A.
AU - Muller, Volker
AU - Skibba, Ramin
AU - Crocce, Martin
AU - Fosalba, Pablo
AU - Gottlober, Stefan
AU - Klypin, Anatoly A.
AU - Power, Chris
AU - Tao, Charling
AU - Turchaninov, Victor
N1 - 16 pages, 15 figures; matches the version accepted by MNRAS; a bug in PINOCCHIO code has been fixed; no major modification from previous version
PY - 2015/9/1
Y1 - 2015/9/1
N2 - We present a comparison of major methodologies of fast generating mock halo or galaxy catalogues. The comparison is done for two-point and the three-point clustering statistics. The reference catalogues are drawn from the BigMultiDark N-body simulation. Both friend-of-friends (including distinct halos only) and spherical overdensity (including distinct halos and subhalos) catalogs have been used with the typical number density of a large-volume galaxy surveys. We demonstrate that a proper biasing model is essential for reproducing the power spectrum at quasilinear and even smaller scales. With respect to various clustering statistics a methodology based on perturbation theory and a realistic biasing model leads to very good agreement with N-body simulations. However, for the quadrupole of the correlation function or the power spectrum, only the method based on semi-N-body simulation could reach high accuracy (1% level) at small scales, i.e., r0.15 h/Mpc. Full N-body solutions will remain indispensable to produce reference catalogues. Nevertheless, we have demonstrated that the far more efficient approximate solvers can reach a few percent accuracy in terms of clustering statistics at the scales interesting for the large-scale structure analysis after calibration with a few reference N-body calculations. This makes them useful for massive production aimed at covariance studies, to scan large parameter spaces, and to estimate uncertainties in data analysis techniques, such as baryon acoustic oscillation reconstruction, redshift distortion measurements, etc.
AB - We present a comparison of major methodologies of fast generating mock halo or galaxy catalogues. The comparison is done for two-point and the three-point clustering statistics. The reference catalogues are drawn from the BigMultiDark N-body simulation. Both friend-of-friends (including distinct halos only) and spherical overdensity (including distinct halos and subhalos) catalogs have been used with the typical number density of a large-volume galaxy surveys. We demonstrate that a proper biasing model is essential for reproducing the power spectrum at quasilinear and even smaller scales. With respect to various clustering statistics a methodology based on perturbation theory and a realistic biasing model leads to very good agreement with N-body simulations. However, for the quadrupole of the correlation function or the power spectrum, only the method based on semi-N-body simulation could reach high accuracy (1% level) at small scales, i.e., r0.15 h/Mpc. Full N-body solutions will remain indispensable to produce reference catalogues. Nevertheless, we have demonstrated that the far more efficient approximate solvers can reach a few percent accuracy in terms of clustering statistics at the scales interesting for the large-scale structure analysis after calibration with a few reference N-body calculations. This makes them useful for massive production aimed at covariance studies, to scan large parameter spaces, and to estimate uncertainties in data analysis techniques, such as baryon acoustic oscillation reconstruction, redshift distortion measurements, etc.
KW - astro-ph.CO
KW - RCUK
KW - STFC
U2 - 10.1093/mnras/stv1289
DO - 10.1093/mnras/stv1289
M3 - Article
SN - 0035-8711
VL - 452
SP - 686
EP - 700
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -