Abstract
After reionisation, the 21cm emission line of neutral hydrogen within galaxies provides a tracer of dark matter. Next-generation intensity mapping surveys, with the SKA and other radio telescopes, will cover large sky areas and a wide range of redshifts, facilitating their use as probes of primordial non-Gaussianity. {Previous works have shown that the bispectrum can achieve tight constraints on primordial non-Gaussianity with future surveys that are purposely designed for intensity mapping in interferometer mode}. Here we investigate the constraints attainable from surveys operating in single-dish mode, \rev{using the combined power spectrum and bispectrum signal}. In the case of the power spectrum, single-dish surveys typically outperform interferometer surveys. We find that the reverse holds for the bispectrum: single-dish surveys are not competitive with surveys designed for interferometer mode.
Original language | English |
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Article number | 100821 |
Number of pages | 17 |
Journal | Physics of the Dark Universe |
Volume | 32 |
Early online date | 18 Apr 2021 |
DOIs | |
Publication status | Published - 1 May 2021 |
Keywords
- astro-ph.CO
- UKRI
- STFC
- ST/P000592/1
- ST/S000550/1
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Karagiannis, D. (Creator), Fonseca, J. (Creator), Maartens, R. (Creator) & Camera, S. (Creator), Elsevier BV, 15 Apr 2021
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