Retrieving cosmological information from small-scale CMB foregrounds I. The thermal Sunyaev Zel'dovich effect

Abstract

We propose a new analysis of small scale CMB data by introducing the cosmological dependency of the foreground signals, focusing first on the thermal Sunyaev-Zel'dovich (tSZ) power spectrum, derived from the halo model. We analyse the latest observations by the South Pole Telescope (SPT) of the high-$\ell$ power (cross) spectra at 90, 150 and 220 GHz, as the sum of CMB and tSZ signals, both depending on cosmological parameters, and remaining contaminants. In order to perform faster analyses, we propose a new tSZ modelling based on machine learning algorithms (namely Random Forest). We show that the additional information contained in the tSZ power spectrum tightens constraints on cosmological and tSZ scaling relation parameters. We combine for the first time the Planck tSZ data with SPT high-$\ell$ to derive even stronger constraints. Finally, we show how the amplitude of the remaining kSZ power spectrum varies depending on the assumptions made on both tSZ and cosmological parameters.

Accepted in A&A, Random Forest code for tSZ spectra computation is available on IAS SZ portal SZDB: https://szdb.osups.universite-paris-saclay.fr/

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Cited by in corpus (8)

• Retrieving cosmological information from small-scale CMB foregrounds II. The kinetic Sunyaev Zel'dovich effect
• Cosmological Probes of Structure Growth and Tests of Gravity
• An exploration of the properties of cluster profiles for the thermal and kinetic Sunyaev-Zel'dovich effects
• Revisiting the large-scale CMB anomalies: The impact of the SZ signal from the Local Universe
• Constraining cosmic reionization by combining the kinetic Sunyaev-Zel'dovich and the 21 cm power spectra
• Self-supervised component separation for the extragalactic submillimeter sky
• The non-thermal secondary CMB anisotropies from a cosmic distribution of radio galaxy lobes
• The case for an all-sky millimetre survey at sub-arcminute resolution