Laura Salvati - Cosmology with tSZ galaxy clusters: impact of the mass calibration

Cosmology with tSZ galaxy clusters: impact of the mass calibration

by Laura Salvati (Univ. Paris-Saclay, Institut d’Astrophysique Spatiale)

Abstract: Galaxy Clusters are a powerful cosmological probe, being able to track the evolution of large scale structure in the latest Universe. In the last decade, different experiments have detected clusters in X-rays, mm and optical-near IR wavelengths, providing catalogs of hundreds of well-characterised objects. Ongoing and future surveys are planned to release catalogs of thousands of clusters to be used for the cosmological analysis. It is therefore timely to nail down the possible sources of systematic uncertainties that might impact the accuracy and precision of the inferred cosmological parameters. From current analyses, the cluster mass calibration stands out as the dominant source of systematics. I will review the basic ingredients used to build the theoretical mass-observable relations and calibrate them, and discuss the biases that these assumptions might introduce in the estimation of the cosmological parameters. I will focus in particular on the analysis of clusters detected through the thermal Sunyaev-Zeldovich effect. I will discuss the results from the first combined cosmological analysis of clusters detected by Planck and the South Pole Telescope. Furthermore, in order to further understand the impact of the modelling of astrophysical processes on cluster cosmology, I will discuss results from a new cosmological analysis of gas fraction for Planck clusters.

Contact: A. Saro

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Inizio evento 01-06-2022 11:30
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