Speaker: Sebastian Grandis
Title: Weak lensing calibrated cluster number counts
Abstract: We will showcase how to find galaxy clusters in X-ray, millimeter, and optical data based on recent results from the South Pole Telescope Collaboration and the eROSITA consortium. We then discuss how weak gravitational lensing allows us to determine the mass scale of the selected clusters, and how the number density of clusters as a function of mass and redshift gives us essential information about the structure of the Cosmos. Our recent analyses show that clusters provide an accurate probe of the cosmological model, complementary and competitive with more established large-scale structure analyses like cosmic shear. We will give a short outlook into upcoming multi-wavelength observing campaigns and their implications for cluster cosmology.
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