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Journal Article

eROSITA camera array on the SRG satellite

MPS-Authors
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Meidinger,  Norbert
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Andritschke,  Robert
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Dennerl,  Konrad
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Emberger,  Valentin
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Eraerds,  Tanja
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Hälker,  Olaf
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Hartner,  Gisela
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Pietschner,  Daniel
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Reiffers,  Jonas
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Meidinger, N., Andritschke, R., Dennerl, K., Emberger, V., Eraerds, T., Hälker, O., et al. (2021). eROSITA camera array on the SRG satellite. Journal of Astronomical Telescopes Instruments and Systems, 7(2): 025004. doi:10.1117/1.JATIS.7.2.025004.


Cite as: http://hdl.handle.net/21.11116/0000-0009-2F97-9
Abstract
The Spectrum-Roentgen-Gamma satellite with the extended roentgen survey with an imaging telescope array (eROSITA) x-ray telescope as scientific payload was successfully launched on July 13, 2019 and deployed in a 6-month halo orbit around the second Lagrange point of the Sun–Earth system. The telescope comprises an array of seven mirror systems with seven focal plane cameras. The spectroscopic CCD cameras are a further development of the very successful EPIC-PN camera on the XMM-Newton satellite, which is still operating after more than 20 years in space. The key component of the camera is the detector, which matches the large field of view of 1 deg to permit an all-sky survey in the energy range from 0.2 to 8 keV with state-of-the-art energy resolution. The image area of the PN-junction charge coupled device comprises 384  ×  384  pixels. The pixel size of 75  ×  75  μm2 each matches the angular resolution of the mirror system. Readout of the full frame is achieved in 9.18 ms but for thermal and onboard event preprocessing reasons, the time resolution is slowed down to 50 ms. The photon entrance window of five of the seven CCDs is equipped with an optical blocking filter, which proved to be advantageous. The improved concept and design of the eROSITA cameras will be explained as well as their operation and performance in space.