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All Sky Modelling Requirements for Bayesian 21 cm Power Spectrum Estimation with BayesEoR by Burba, Jacob; Sims, Peter H.; Pober, Jonathan C. is a scholarly article available to read on EtoBox.

What is All Sky Modelling Requirements for Bayesian 21 cm Power Spectrum Estimation with BayesEoR about?

We present a comprehensive simulation-based study of the BayesEoR code for 21 cm power spectrum recovery when analytically marginalizing over foreground parameters. To account for covariance between the 21 cm signal and contaminating foreground emission, BayesEoR jointly constructs models for both signals within a Bayesian framework. Due to computational constraints, the forward model is constructed using a restricted field-of-view (FoV) in the image domain. When the only EoR contaminants are noise and foregrounds, we demonstrate that BayesEoR can accurately recover the 21 cm power spectrum when the component of sky emission outside this forward-modelled region is downweighted by the beam at the level of the dynamic range between the foreground and 21 cm signals. However, when all-sky foreground emission is included along with a realistic instrument primary beam with sidelobes above this threshold extending to the horizon, the recovered power spectrum is contaminated by unmodelled sky emission outside the restricted FoV model. Expanding the combined cosmological and foreground model to cover the whole sky is computationally prohibitive. To address this, we present a modified versio

Author

Burba, Jacob; Sims, Peter H.; Pober, Jonathan C.

Published

2023

Language

EN