Full-sky bispectrum in redshift space for 21cm intensity maps

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Date

2020

Journal Title

Journal ISSN

Volume Title

Publisher

IOP Publishing

Abstract

We compute the tree-level bispectrum of 21cm intensity mapping after reionisation. We work in directly observable angular and redshift space, focusing on equal-redshift correlations and thin redshift bins, for which the lensing contribution is negligible. We demonstrate the importance of the contributions from redshift-space distortions which typically dominate the result. Taking into account the effects of telescope beams and foreground cleaning, we estimate the signal to noise, and show that the bispectrum is detectable by both SKA in single-dish mode and HIRAX in interferometer mode, especially at the lower redshifts in their respective ranges.

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Keywords

Gravitational lensing, Redshift surveys, Bispectrum, Reionization, Cosmological

Citation

Kothari, R. et al. (2020). Full-sky bispectrum in redshift space for 21cm intensity maps. Journal of Cosmology and Astroparticle Physics, 2020(11),