Speaker
Description
The abundance of galaxy clusters as a function of mass and redshift is a powerful cosmological probe, sensitive to both the matter content of the Universe and the growth of large-scale structure. We present a pipeline to derive cosmological constraints from a sample of galaxy clusters detected during the 4.4 all-sky surveys performed by the X-ray telescope eROSITA. Together with cluster number counts, we employ stacked tangential shear profile measurements coming from the galaxy surveys DESY3 and DECADE to calibrate cluster masses. We validate our full analysis pipeline on realistic simulated datasets, demonstrating unbiased recovery of the input cosmological parameters and robustness against systematic effects. This work represents a crucial step toward extracting cosmological constraints from the final eROSITA cluster sample.