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Extending the halo mass resolution of N-body simulations.

Angulo, R.E. and Baugh, C.M. and Frenk, C.S. and Lacey, C.G. (2014) 'Extending the halo mass resolution of N-body simulations.', Monthly notices of the Royal Astronomical Society., 442 (4). pp. 3256-3265.


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.

Item Type:Article
Keywords:Cosmology: theory, Large-scale structure of Universe.
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Publisher statement:© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Date accepted:No date available
Date deposited:14 August 2014
Date of first online publication:June 2014
Date first made open access:No date available

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