Bayesian angular power spectrum analysis of interferometric data

Abstract

We present a Bayesian angular power spectrum and signal map inference engine which can be adapted to interferometric observations of anisotropies inthe cosmic microwave background, 21 cm emission line mapping of galactic brightness fluctuations, or 21 cm absorption line mapping of neutral hydrogen in the dark ages. The method uses Gibbs sampling to generate a sampled representation of the angular power spectrum posterior and the posterior of signal maps given a set of measured visibilities in the uv-plane. We use a mock interferometric CMB observation to demonstrate the validity of this method in the flat-sky approximation when adapted to take into account arbitrary coverage of the uv-plane, mode-mode correlations due to observations on a finite patch, and heteroschedastic visibility errors. The computational requirements scale as O(n_p log n_p) where n_p measures the ratio of the size of the detector array to the inter-detector spacing, meaning that Gibbs sampling is a promising technique for meeting the data analysis requirements of future cosmology missions.

7 pages, 10 figures, expanded discussion and edited to match ApJS approved version, affiliations updated

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Cited by in corpus (12)

• Empirical Covariance Modeling for 21 cm Power Spectrum Estimation: A Method Demonstration and New Limits from Early Murchison Widefield Array 128-Tile Data
• A Fast Method for Power Spectrum and Foreground Analysis for 21 cm Cosmology
• RESOLVE: A new algorithm for aperture synthesis imaging of extended emission in radio astronomy
• Mapmaking for Precision 21 cm Cosmology
• Bayesian semi-blind component separation for foreground removal in interferometric 21-cm observations
• Probabilistic image reconstruction for radio interferometers
• Bayesian Inference for Radio Observations
• A new approach to multi-frequency synthesis in radio interferometry
• Bayesian Inference of Polarized CMB Power Spectra from Interferometric Data
• Systematic Effects in Interferometric Observations of the CMB Polarization
• Fisher Matrix Optimization of Cosmic Microwave Background Interferometers
• It's Always Darkest Before the Cosmic Dawn: Early Results from Novel Tools and Telescopes for 21 cm Cosmology