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  SRG/eROSITA in-flight background at L2

Freyberg, M. J., Perinati, E., Pacaud, F., Eraerds, T., Churazov, E., Dennerl, K., et al. (2020). SRG/eROSITA in-flight background at L2. In Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray. doi:10.1117/12.2562709.

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 Creators:
Freyberg, Michael J.1, Author              
Perinati, Emanuele, Author
Pacaud, Florian, Author
Eraerds, Tanja1, Author              
Churazov, Eugene, Author
Dennerl, Konrad1, Author              
Predehl, Peter1, Author              
Merloni, Andrea1, Author              
Meidinger, Norbert1, Author              
Esra, Bulbul1, Author              
Friedrich, Susanne2, Author              
Gilfanov, Marat, Author
Tenzer, Chris, Author
Pommranz, Christian, Author
Eckert, Dominique, Author
Schmitt, Jürgen, Author
Brusa, Marcella, Author
Santangelo, Andrea, Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              
2Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: eROSITA aboard the Spectrum-Roentgen-Gamma satellite, successfully launched in July 2019, is the first X-ray astronomical telescope operational at the Sun-Earth Lagrange point L2. A prime scientific goal of eROSITA is the detection of 100000 clusters of galaxies, which at the fainter luminosity end appears as weak and slightly extended objects. For a reliable detection and characterization of the sources also a detailed knowledge of the instrumental background is required. In the light of the upcoming ESA Athena mission and other future X-ray missions, eROSITA can play a role as pathfinder in terms of space environment and non-X-ray background at L2.. Initial results related to the eROSITA in-flight background have been obtained during Commissioning and subsequent Calibration and Performance Verification phases. The eROSITA background is composed of various components, such as from the electronics, from particle induced radiation inside the camera, external particles registered (and rejected) onboard, stray-light from celestial sources, and general X-ray background. By means of dedicated variations of the set-up (e.g., filter wheel, on-board processing) and viewing direction we started to disentangle the components and origins. Particle background variations appear to be low, which may be expected due to the low solar activity at the moment. The general background level appears to exceed pre-launch expectation. This is currently under investigation.

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Language(s): eng - English
 Dates: 2020-12-13
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1117/12.2562709
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Title: Conference on Space Telescopes and Instrumentation - Ultraviolet to Gamma Ray / SPIE Astronomical Telescopes + Instrumentation Conference
Place of Event: ELECTR NETWORK
Start-/End Date: 2020-12-14 - 2020-12-18

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Title: Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray
Source Genre: Proceedings
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Pages: - Volume / Issue: 11444 Sequence Number: 114441O Start / End Page: - Identifier: -