https://doi.org/10.1051/epjconf/202225700014
CMB at small scales: Cosmology from tSZ power spectrum
1 Institut d’Astrophysique Spatiale, CNRS, Université Paris Saclay, Orsay, France
2 Department of Physics and McGill Space Institute, McGill University, Montreal, QC, Canada H3A 2T8
* e-mail: marian.douspis@ias.u-psud.fr
Published online: 17 January 2022
Small scale CMB angular power spectrum contains not only primordial CMB information but also many contaminants coming from secondary anisotropies. Most of the latter depend on the cosmological model but are often marginalised over. We propose a new analysis of the SPT data focusing on the cosmological contribution of the thermal Sunyaev Zel’dovich (tSZ) effect. We model the tSZ angular spectrum with the halo model and train a random forest algorithm to speed up its computation. We show that using the cosmological information of the tSZ on top of the primordial CMB one contained in SPT data bring more constraints on cosmological parameters. We also combine for the first time Planck tSZ angular power spectrum with SPT ones to put further constraints. This proof of concept study shows how much a proper modelling of the foregrounds in the cosmological analyses is needed.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
