Successfully launched in July 2019, eROSITA, the German-built telescope array operating between 0.2-8 keV on board the Russian-German Spectrum-RG (SRG) mission will deliver the largest catalogs of clusters of galaxies. Clusters of galaxies trace the highest peaks in the cosmic density field and offer an independent and powerful probe of the growth of structure. The final eROSITA All-Sky Survey catalog with more than 100,000 clusters will put us on the verge of a breakthrough in precision cosmological measurements. At the depth of the final All-Sky Survey, the eROSITA Final Equatorial Survey (eFEDS), executed during the Performance Verification phase, has provided a sneak preview of rich cluster science that will be achieved by eROSITA. I will summarise the published eFEDS results and provide the demographics of clusters of galaxies identified in the eROSITA's first All-Sky survey.
See Esra's webpage