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Cosmic shear power spectra in practice

Author(s): Nicola, Andrina; García-García, Carlos; Alonso, David; Dunkley, Jo; Ferreira, Pedro G; et al

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dc.contributor.authorNicola, Andrina-
dc.contributor.authorGarcía-García, Carlos-
dc.contributor.authorAlonso, David-
dc.contributor.authorDunkley, Jo-
dc.contributor.authorFerreira, Pedro G-
dc.contributor.authorSlosar, Anže-
dc.contributor.authorSpergel, David N-
dc.date.accessioned2024-06-12T18:28:23Z-
dc.date.available2024-06-12T18:28:23Z-
dc.date.issued2021-03-22en_US
dc.identifier.citationNicola, Andrina, García-García, Carlos, Alonso, David, Dunkley, Jo, Ferreira, Pedro G, Slosar, Anže, Spergel, David N. (2021). Cosmic shear power spectra in practice. Journal of Cosmology and Astroparticle Physics, 2021 (03), 067 - 067. doi:10.1088/1475-7516/2021/03/067en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1xg9fb59-
dc.description.abstractCosmic shear is one of the most powerful probes of Dark Energy, targeted by several current and future galaxy surveys. Lensing shear, however, is only sampled at the positions of galaxies with measured shapes in the catalog, making its associated sky window function one of the most complicated amongst all projected cosmological probes of inhomogeneities, as well as giving rise to inhomogeneous noise. Partly for this reason, cosmic shear analyses have been mostly carried out in real-space, making use of correlation functions, as opposed to Fourier-space power spectra. Since the use of power spectra can yield complementary information and has numerical advantages over real-space pipelines, it is important to develop a complete formalism describing the standard unbiased power spectrum estimators as well as their associated uncertainties. Building on previous work, this paper contains a study of the main complications associated with estimating and interpreting shear power spectra, and presents fast and accurate methods to estimate two key quantities needed for their practical usage: the noise bias and the Gaussian covariance matrix, fully accounting for survey geometry, with some of these results also applicable to other cosmological probes. We demonstrate the performance of these methods by applying them to the latest public data releases of the Hyper Suprime-Cam and the Dark Energy Survey collaborations, quantifying the presence of systematics in our measurements and the validity of the covariance matrix estimate. We make the resulting power spectra, covariance matrices, null tests and all associated data necessary for a full cosmological analysis publicly available.en_US
dc.format.extent067 - 067en_US
dc.relation.ispartofJournal of Cosmology and Astroparticle Physicsen_US
dc.rightsAuthor's manuscripten_US
dc.subjectpower spectrum, weak gravitational lensingen_US
dc.titleCosmic shear power spectra in practiceen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1088/1475-7516/2021/03/067-
dc.date.eissued2021-03-22en_US
dc.identifier.eissn1475-7516-
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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