Browsing Faculty of Natural Sciences by Author "Cunnington, Steven"
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The fore ground transfer function for H I intensity mapping signal reconstruction: MeerKLASS and precision cosmology applications
Cunnington, Steven; Wolz, Laura; Bull, Philip (Oxford University Press, 2023)Blind cleaning methods are currently the preferred strategy for handling foreground contamination in single-dish H I intensity mapping surv e ys. Despite the increasing sophistication of blind techniques, some signal loss ... -
The H I intensity mapping bispectrum including observational effects
Cunnington, Steven; Watkinson, Catherine; Pourtsidou, Alkistis (2021-07-30)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 intensity mapping with MeerKAT: Power spectrum detection in cross-correlation with WiggleZ galaxies
Cunnington, Steven; Li, Yichao; Santos, Mario G. (Oxford University Press, 2023)We present a detection of correlated clustering between MeerKAT radio intensity maps and galaxies from the WiggleZ Dark Energy Survey. We find a 7.7σ detection of the cross-correlation power spectrum, the amplitude of which ... -
Multipole expansion for H I intensity mapping experiments: simulations and modelling
Pourtsidou, Alkistis; Cunnington, Steven; Soares, Paula S. (Oxford University Press, 2020)We present a framework and an open-source PYTHON toolkit to analyse the two-point statistics of 3D fluctuations in the context of H I intensity maps using the multipole expansion formalism. We include simulations of the ... -
SKAO HI intensity mapping: blind foreground subtraction challenge
Spinelli, Marta; Carucci, Isabella, P.; Cunnington, Steven (University of the Western Cape, 2022)Neutral Hydrogen Intensity Mapping (H I IM) surveys will be a powerful new probe of cosmology. However, strong astrophysical foregrounds contaminate the signal and their coupling with instrumental systematics further ...