Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 479, Issue 4, Pages 5168-5183Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1814
Keywords
methods: statistical; surveys; large-scale structure of Universe
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Funding
- MUIR PRIN 2015
- Agenzia Spaziale Italiana [ASI/INAF/I/023/12/0]
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The peculiar velocities of galaxies cause their redshift-space clustering to depend on the angle to the line of sight, providing a key test of gravitational physics on cosmological scales. These effects may be described using a multipole expansion of the clustering measurements. Focussing on Fourier-space statistics, we present a new analysis of the effect of the survey window function, and the variation of the line of sight across a survey, on the modelling of power spectrum multipoles. We determine the joint covariance of the Fourier-space multipoles in a Gaussian approximation, and indicate how these techniques may be extended to studies of overlapping galaxy populations via multipole cross-power spectra. We apply our methodology to one of the widest area galaxy redshift surveys currently available, the 6-degree Field Galaxy Survey, deducing a normalized growth rate f sigma 8(z = 0.06) = 0.38 +/- 0.12 in the low-redshift Universe, in agreement with previous analyses of this data set using different techniques. Our framework should be useful for processing future wide-angle galaxy redshift surveys.
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