Estimating the power spectrum covariance matrix with fewer mock samples

• Published in: Monthly notices of the Royal Astronomical Society Vol. 457; no. 1; pp. 993 - 999
• Main Authors: Pearson, David W., Samushia, Lado
• Format: Journal Article
• Language: English
• Published: London Oxford University Press 21.03.2016
• Subjects: Accuracy; Astronomy; Catalogues; Convergence; Covariance; Covariance matrix; Estimating; Galaxies; Inverse; Mathematical models; Matrix; Star & galaxy formation; methods: data analysis; galaxies: statistics; cosmological parameters; large-scale structure of Universe

The covariance matrices of power-spectrum (P(k)) measurements from galaxy surveys are difficult to compute theoretically. The current best practice is to estimate covariance matrices by computing a sample covariance of a large number of mock catalogues. The next generation of galaxy surveys will req...