Journal article

Reionization inference from the CMB optical depth and E-mode polarization power spectra

Yuxiang Qin, Vivian Poulin, Andrei Mesinger, Bradley Greig, Steven Murray, Jaehong Park

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2020

Abstract

The Epoch of Reionization (EoR) depends on the complex astrophysics governing the birth and evolution of the first galaxies and structures in the intergalactic medium. EoR models rely on cosmicmicrowave background (CMB) observations, and in particular the large-scale E-mode polarization power spectra (EE PS), to help constrain their highly uncertain parameters. However, rather than directly forward-modelling the EE PS, most EoR models are constrained using a summary statistic - the Thompson scattering optical depth, τe. Compressing CMB observations to τerequires adopting a basis set for the EoR history. The common choice is the unphysical, redshift-symmetric hyperbolic tangent (tanh) functio..

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Grants

Awarded by European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (AIDA)


Awarded by Australian Research Council (ARC) Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)


Funding Acknowledgements

The authors thank V. Miranda for providing data from Miranda et al. (2017). This work was supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (AIDA -#638809). The results presented here reflect the authors' views; the ERC is not responsible for their use. Parts of this research were supported by the Australian Research Council (ARC) Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project #CE170100013.