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• W2945249301 abstract "ABSTRACT Fluctuations in the large-scale structure of the Universe contain significant information about cosmological physics, but are modulated in survey data sets by various observational effects. Building on existing literature, we provide a general treatment of how fluctuation power spectra are modified by a position-dependent selection function, noise, weighting, smoothing, pixelization, and discretization. Our work has relevance for the spatial power spectrum analysis of galaxy surveys with spectroscopic or accurate photometric redshifts, and radio intensity-mapping surveys of the sky brightness temperature including generic noise, telescope beams, and pixelization. We consider the autopower spectrum of a field, the cross-power spectrum between two fields and the multipoles of these power spectra with respect to a curved sky, deriving the corresponding power spectrum models, estimators, errors, and optimal weights. We note that ‘FKP weights’ for individual tracers do not in general provide the optimal weights when measuring the cross-power spectrum. We validate our models using mock data sets drawn fromN-body simulations.1 Our treatment should be useful for modelling and studying cosmological fluctuation fields in observed and simulated data sets." @default.
• W2945249301 created "2019-05-29" @default.
• W2945249301 creator A5084029871 @default.
• W2945249301 date "2019-08-05" @default.
• W2945249301 modified "2023-10-16" @default.
• W2945249301 title "Power spectrum modelling of galaxy and radio intensity maps including observational effects" @default.
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• W2945249301 doi "https://doi.org/10.1093/mnras/stz2145" @default.
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