Multipole expansion for H I intensity mapping experiments: simulations and modelling
Loading...
Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
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 cosmological H I signal using N-body and lognormal methods, foregrounds and their removal, as well as instrumental effects. Using these simulations and analytical modelling, we investigate the impact of foreground cleaning and the instrumental beam on the power spectrum multipoles as well as on the Fourier space clustering wedges. We find that both the instrumental beam and the foreground removal can produce a quadrupole (and a hexadecapole) signal, and demonstrate the importance of controlling and accurately modelling these effects for precision radio cosmology.
Description
Keywords
Cosmological parameters, Large-scale structure of Universe, Cosmology: observations, Cosmology: theory, Radio lines: general
Citation
Pourtsidou, A. et al. (2020). Multipole expansion for H I intensity mapping experiments: simulations and modelling. Monthly Notices of the Royal Astronomical Society, 496(1), 415–433,