The H I intensity mapping bispectrum including observational effects
| dc.contributor.author | Cunnington, Steven | |
| dc.contributor.author | Watkinson, Catherine | |
| dc.contributor.author | Pourtsidou, Alkistis | |
| dc.date.accessioned | 2021-10-21T11:10:43Z | |
| dc.date.available | 2021-10-21T11:10:43Z | |
| dc.date.issued | 2021-07-30 | |
| dc.description.abstract | The bispectrum is a three-point statistic with the potential to provide additional information beyond power spectra analyses of survey data sets. Radio telescopes that broadly survey the 21-cm emission from neutral hydrogen (H I) are a promising way to probe LSS and in this work we present an investigation into the H I intensity mapping (IM) bispectrum using simulations. We present a model of the redshift space H I IM bispectrum including observational effects from the radio telescope beam and 21-cm foreground contamination. We validate our modelling prescriptions with measurements from robust IM simulations, inclusive of these observational effects. Our foreground simulations include polarization leakage, on which we use a principal component analysis cleaning method. We also investigate the effects from a non-Gaussian beam including side-lobes. For a MeerKAT-like single-dish IM survey at z = 0.39, we find that foreground removal causes an 8 per cent reduction in the equilateral bispectrum’s signal-to-noise ratio, whereas the beam reduces it by 62 per cent. We find our models perform well, generally providing χ2 dof ∼ 1, indicating a good fit to the data. Whilst our focus is on post-reionization, single-dish IM, our modelling of observational effects, especially foreground removal, can also be relevant to interferometers and reionization studies. | en_US |
| dc.identifier.citation | Cunnington. (2021). The H i intensity mapping bispectrum including observational effects. Monthly Notices of the Royal Astronomical Society., 507(2), 1623–1639. https://doi.org/10.1093/mnras/stab2200 | en_US |
| dc.identifier.uri | https://doi.org/10.1093/mnras/stab2200 | |
| dc.identifier.uri | http://hdl.handle.net/10566/6933 | |
| dc.language.iso | en | en_US |
| dc.subject | data analysis – methods | en_US |
| dc.subject | statistical – cosmology | en_US |
| dc.subject | observations – cosmology | en_US |
| dc.subject | Methods | en_US |
| dc.title | The H I intensity mapping bispectrum including observational effects | en_US |
| dc.type | Article | en_US |