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Rapid modelling of the redshift-space power spectrum multipoles for a masked density field

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arxiv 1511.07799 v2 pith:ZCPHRNPE submitted 2015-11-24 astro-ph.CO

Rapid modelling of the redshift-space power spectrum multipoles for a masked density field

Michael J. Wilson , John A. Peacock , Andy N. Taylor , Sylvain de la Torre This is my paper
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keywords redshift-spacedensityfieldmaskedmodellingmomentsmultipolepower
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In this work we reformulate the forward modelling of the redshift-space power spectrum multipole moments for a masked density field, as encountered in galaxy redshift surveys. Exploiting the symmetries of the redshift-space correlation function, we provide a masked-field generalisation of the Hankel transform relation between the multipole moments in real and Fourier space. Using this result, we detail how a likelihood analysis requiring computation for a broad range of desired $P(k)$ models may be executed $10^3-10^4$ times faster than with other common approaches, together with significant gains in spectral resolution. We present a concrete application to the complex angular geometry of the VIPERS PDR-1 release and discuss the validity of this technique for finite-angle surveys.

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