Statistical recovery of the BAO scale from multipoles of the beam-convolved 21 cm correlation function

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dc.contributor.authorKennedy, F.
dc.contributor.authorBull, P.
dc.date.accessioned2021-09-22T05:45:19Z
dc.date.available2021-09-22T05:45:19Z
dc.date.issued2021
dc.description.abstractDespite being designed as an interferometer, theMeerKAT radio array (a Square Kilometre Array pathfinder) can also be used in autocorrelation (‘single-dish’) mode, where each dish scans the sky independently. Operating in this mode allows extremely high survey speeds to be achieved, albeit at significantly lower angular resolution. We investigate the recovery of the baryon acoustic oscillation (BAO) scale from multipoles of the redshift-space correlation function as measured by a low angular resolution 21 cm intensity mapping survey of this kind. Our approach is to construct an analytic model of the multipoles of the correlation function and their covariance matrix that includes foreground contamination and beam resolution effects, which we then use to generate an ensemble of mock data vectors from which we attempt to recover the BAO scale. In line with previous studies, we find that recovery of the transverse BAO scale is hampered by the strong smoothing effect of the instrumental beam with increasing redshift, while the radial scale is much more robust. The multipole formalism naturally incorporates transverse information when it is available however, and so there is no need to perform a radial-only analysis. In particular, the quadrupole of the correlation function preserves a distinctive BAO ‘bump’ feature even for large smoothing scales. We also investigate the robustness of BAO scale recovery to beam model accuracy, severity of the foreground removal cuts, and accuracy of the covariance matrix model, finding in all cases that the radial BAO scale can be recovered in an accurate, unbiased manner.en_US
dc.identifier.citationKennedy, Fraser & Bull, Philip. (2021). Statistical recovery of the BAO scale from multipoles of the beam-convolved 21cm correlation function. Monthly Notices of the Royal Astronomical Society. 506. 10.1093/mnras/stab1814.en_US
dc.identifier.issn0035-8711
dc.identifier.uri10.1093/mnras/stab1814
dc.identifier.urihttp://hdl.handle.net/10566/6749
dc.language.isoenen_US
dc.publisherRoyal Astronomical Societyen_US
dc.subjectRadio linesen_US
dc.subjectCosmologyen_US
dc.subjectStructure of Universeen_US
dc.subjectGalaxiesen_US
dc.subjectData analysisen_US
dc.subjectObservationsen_US
dc.titleStatistical recovery of the BAO scale from multipoles of the beam-convolved 21 cm correlation functionen_US
dc.typeArticleen_US

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