This thesis is concerned with the detection of galaxy clusters in X-rays. For test measurements of the currently developed X-ray telescope eROSITA (extended ROentgen Survey with an Imaging Telescope Array), I have developed an algorithm for sub-pixel resolution, which allows for a significantly improved characterization of the point spread function of the new mirrors. Furthermmore, I developed image simulators for eROSITA and for the currently operating X-ray observatory XMM-Newton. With the latter, I could determine the sensitivity of a current X-ray survey with XMM, concerning the identification of galaxy clusters. For eROSITA, I could estimate the cluster yield of the future survey with an alternative approach and hereby confirm the scientifc goal of the mission.
«This thesis is concerned with the detection of galaxy clusters in X-rays. For test measurements of the currently developed X-ray telescope eROSITA (extended ROentgen Survey with an Imaging Telescope Array), I have developed an algorithm for sub-pixel resolution, which allows for a significantly improved characterization of the point spread function of the new mirrors. Furthermmore, I developed image simulators for eROSITA and for the currently operating X-ray observatory XMM-Newton. With the la...
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