Optimal weights for measuring redshift space distortions in multitracer galaxy catalogues

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dc.contributor.author Pearson, David W.
dc.contributor.author Samushia, Lado
dc.contributor.author Gagrani, Praful
dc.date.accessioned 2017-12-12T20:40:18Z
dc.date.available 2017-12-12T20:40:18Z
dc.identifier.uri http://hdl.handle.net/2097/38455
dc.description Citation: Pearson, D. W., Samushia, L., & Gagrani, P. (2016). Optimal weights for measuring redshift space distortions in multitracer galaxy catalogues. Monthly Notices of the Royal Astronomical Society, 463(3), 2708-2715. doi:10.1093/mnras/stw2177
dc.description.abstract Since the volume accessible to galaxy surveys is fundamentally limited, it is extremely important to analyse available data in the most optimal fashion. One way of enhancing the cosmological information extracted from the clustering of galaxies is by weighting the galaxy field. The most widely used weighting schemes assign weights to galaxies based on the average local density in the region (FKP weights) and their bias with respect to the dark matter field (PVP weights). They are designed to minimize the fractional variance of the galaxy power-spectrum. We demonstrate that the currently used bias dependent weighting scheme can be further optimized for specific cosmological parameters. We develop a procedure for computing the optimal weights and test them against mock catalogues for which the values of all fitting parameters, as well as the input power-spectrum are known. We show that by applying these weights to the joint power-spectrum of emission line galaxies and luminous red galaxies from the Dark Energy Spectroscopic Instrument survey, the variance in the measured growth rate parameter can be reduced by as much as 36 per cent.
dc.relation.uri https://doi.org/10.1093/mnras/stw2177
dc.rights © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri https://academic.oup.com/journals/pages/access_purchase/rights_and_permissions/self_archiving_policy_p
dc.subject Methods: Data Analysis
dc.subject Galaxies: Statistics
dc.subject Cosmological Parameters
dc.subject Large-Scale Structure Of Universe
dc.subject Oscillation Spectroscopic Survey
dc.subject Baryon Acoustic-Oscillations
dc.title Optimal weights for measuring redshift space distortions in multitracer galaxy catalogues
dc.type Article
dc.date.published 2016
dc.citation.doi 10.1093/mnras/stw2177
dc.citation.epage 2715
dc.citation.issn 0035-8711
dc.citation.issue 3
dc.citation.jtitle Monthly Notices of the Royal Astronomical Society
dc.citation.spage 2708
dc.citation.volume 463
dc.contributor.authoreid lado
dc.contributor.kstate Samushia, Lado

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