R.E. Angulo
Extending the halo mass resolution of N-body simulations
Angulo, R.E.; Baugh, C.M.; Frenk, C.S.; Lacey, C.G.
Authors
Professor Carlton Baugh c.m.baugh@durham.ac.uk
Professor
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
Professor Cedric Lacey cedric.lacey@durham.ac.uk
Professor
Abstract
We present a scheme to extend the halo mass resolution of dark matter N-body simulations. The method uses the simulated density field to predict the number of sub-resolution haloes expected in different regions, taking as input the abundance and the bias factors of haloes of a given mass. These quantities can be computed analytically or measured from higher resolution simulations. We show that the method recovers the abundance and clustering in real- and redshift-space of haloes with mass below ∼7.5 × 1013 h−1 M⊙ at z = 0 to better than 10 per cent. By applying the method to an ensemble of 50 low-resolution, large-volume simulations, we compute the expected correlation function and covariance matrix of luminous red galaxies (LRGs), which we compare to state-of-the-art baryonic acoustic oscillation measurements. The original simulations resolve just two-thirds of the LRG population, so we extend their resolution by a factor of 30 in halo mass in order to recover all LRGs. Using our method, it is now feasible to build the large numbers of high-resolution large volume mock galaxy catalogues required to compute the covariance matrices necessary to analyse upcoming galaxy surveys designed to probe dark energy.
Journal Article Type | Article |
---|---|
Publication Date | 2014-06 |
Deposit Date | May 16, 2014 |
Publicly Available Date | Aug 14, 2014 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 442 |
Issue | 4 |
Pages | 3256-3265 |
DOI | https://doi.org/10.1093/mnras/stu1084 |
Keywords | Cosmology: theory, Large-scale structure of Universe. |
Public URL | https://durham-repository.worktribe.com/output/1433360 |
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Copyright Statement
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
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