http://arxiv.org/abs/1811.08155
Likelihood fitting to 2-point clustering statistics made from galaxy surveys usually assumes a multivariate normal distribution for the measurements, with justification based on the central limit theorem given the large number of over-density modes. However, this assumption cannot hold on the largest scales where the number of modes is low. While more accurate distributions have previously been developed in idealized cases, we derive a procedure suitable for analysing measured monopole power spectra with window effects, stochastic shot noise and the dependence of the covariance matrix on the model being fitted all taken into account. A data transformation is proposed to give an approximately Gaussian likelihood, with a variance–correlation decomposition of the covariance matrix to account for its cosmological dependence. By comparing with the modified-$t$ likelihood derived under the usual normality assumption by Sellentin & Heavens (2016, arXiv:1511.05969), we find in numerical tests that our new procedure gives more accurate constraints on the local non-Gaussianity parameter $f_\textrm{NL}$, which is sensitive to the large-scale power. A simple data analysis pipeline is provided for straightforward application of this new approach in preparation for forthcoming large galaxy surveys such as DESI and Euclid.
M. Mike, W. Wang, W. Percival, et. al.
Wed, 21 Nov 18
22/74
Comments: 16 pages, 6 figures, submitted to MNRAS
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