Orateur
Description
As demonstrated by Planck, ACT, and SPT, the abundance of tSZ-detected galaxy clusters across mass and redshift is a powerful cosmological probe. The upcoming Simons Observatory (SO) will lead to the detection of about 20 000 clusters, an order of magnitude more objects than what previous experiments found, thereby providing an unprecedented constraining potential. However, in order for this potential to be realised, cluster detection and analysis (likelihood) pipelines will have to be developed and understood to a much higher level of accuracy than previously demonstrated.
In this talk I will discuss ongoing efforts towards the accurate modelling of cluster SZ counts, focusing on the improvements regarding noise biases, covariance estimation, and deprojection of contaminating signals such as the CIB of Zubeldia et al. 2021, 2022a & 2022b. I will then discuss the application of these improved cluster detection and characterisation methods to Planck data, presenting a new Planck catalogue and cosmological constraints derived from it. Finally, I will briefly address how these improved techniques can be applied to SO data and will show some results from an end-to-end cluster cosmology validation project currently under way.
