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Characterization of the Particle-induced Background of XMM-Newton EPIC-pn: Short- and Long-term Variability

Bulbul, Esra; Kraft, Ralph; Nulsen, Paul; Freyberg, Michael; Miller, Eric D.; Grant, Catherine; Bautz, Mark W.; Burrows, David N.; Allen, Steven; Eraerds, Tanja; Fioretti, Valentina; Gastaldello, Fabio; Ghirardini, Vittorio; Hall, David; Meidinger, Norbert; Molendi, Silvano; Rau, Arne; Wilkins, Dan and Wilms, Joern (2020). Characterization of the Particle-induced Background of XMM-Newton EPIC-pn: Short- and Long-term Variability. The Astrophysical Journal, 891(13), article no. 1.

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The particle-induced background of X-ray observatories is produced by galactic cosmic ray (GCR) primary protons, electrons, and He ions. Events due to direct interaction with the detector are usually removed by onboard processing. The interactions of these primary particles with the detector environment produce secondary particles that mimic X-ray events from celestial sources, and are much more difficult to identify. The filter-wheel closed data from the XMM-Newton EPIC-pn camera in small window mode (SWM) contains both the X-ray-like background events, and the events due to direct interactions with the primary particles. From this data, we demonstrate that X-ray-like background events are spatially correlated with the primary particle interaction. This result can be used to further characterize and reduce the non-X-ray background in silicon-based X-ray detectors in current and future missions. We also show that spectrum and pattern fractions of secondary particle events are different from those produced by cosmic X-rays.

Item Type: Journal Item
Copyright Holders: 2020 The American Astronomical Society
ISSN: 1538-4357
Keywords: Solar energetic particles; X-ray telescopes; galactic cosmic rays; sstronomical instrumentation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Item ID: 69780
Depositing User: David Hall
Date Deposited: 16 Mar 2020 10:19
Last Modified: 11 Jul 2020 22:55
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