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Extending the halo mass resolution of N-body simulations

Angulo, R.E.; Baugh, C.M.; Frenk, C.S.; Lacey, C.G.

Extending the halo mass resolution of N-body simulations Thumbnail


R.E. Angulo


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.


Angulo, R., Baugh, C., Frenk, C., & Lacey, C. (2014). Extending the halo mass resolution of N-body simulations. Monthly Notices of the Royal Astronomical Society, 442(4), 3256-3265.

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
Keywords Cosmology: theory, Large-scale structure of Universe.


Published Journal Article (564 Kb)

Copyright Statement
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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