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Scientific article
English

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

Published inJournal of cosmology and astroparticle physics, vol. 2020, no. 12
Publication date2020-12-01
First online date2020-10-07
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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Citation (ISO format)
DURRER, Ruth et al. Full-sky bispectrum in redshift space for 21cm intensity maps. In: Journal of cosmology and astroparticle physics, 2020, vol. 2020, n° 12. doi: 10.1088/1475-7516/2020/12/003
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ISSN of the journal1475-7516
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