The power of eROSITA, the core instrument on the Russian-German SRG mission, is high sensitivity at high spectral, spatial, and temporal resolution over a large field of view. This is achieved by combining 7 coaligned fast X-ray optics, each composed of 54 mirror shells, to focus the X-rays onto a total of 1 million pixels, which can all be used as spectrographs. On their way to the CCDs, the photons have to penetrate optical blocking filters, because X-ray CCDs are also sensitive to optical light. All these components need to be calibrated in order to make full scientific use of the unique capabilities of eROSITA. The initial ground calibration was done at the PANTER and PUMA facilities of MPE as well as at BESSY, and was completed by an in-orbit calibration. We report on the extensive and often challenging calibration activities performed on ground and in space.
|Presenter status||eROSITA consortium member|