期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 442, 期 4, 页码 3256-3265出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1084
关键词
cosmology: theory; large-scale structure of Universe
资金
- STFC
- Large Facilities Capital Fund of BIS
- Durham University
- STFC rolling grant in theoretical cosmology [ST/F001166/1]
- ERC Advanced Investigator grant, COSMIWAY
- STFC [ST/I00162X/1, ST/F002300/1, ST/I001166/1, ST/H008519/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002300/1, ST/I00162X/1, ST/H008519/1, ST/I001166/1] Funding Source: researchfish
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 similar to 7.5 x 10(13) h(-1) M-aS (TM) 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.
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