The radiation environment in L-2 orbit: implications on the non-X-ray background of the eROSITA pn-CCD cameras |
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| Authors: | Emanuele Perinati Chris Tenzer Andrea Santangelo Konrad Dennerl Michael Freyberg Peter Predehl |
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| Institution: | 1. IAAT- Institut f??r Astronomie und Astrophysik, 72076, T??bingen, Germany
2. MPE- Max Planck Institut f??r Extraterrestrische Physik, 85748, Garching, Germany
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| Abstract: | The pn-CCD cameras at the focal plane of the eROSITA space observatory will be the first X-ray (0.2?C12?keV) detector to operate in a L-2 orbit. Therefore, no direct information of instrumental non X-ray background (NXB) is available to make predictions for eROSITA. Since, in general, the instrumental NXB experienced in orbit has a major impact on the overall sensitivity of the cameras, we investigated and modeled the L-2 radiation environment and its interaction with the eROSITA mass distribution and cameras, in order to quantify the expected pn-CCD NXB level. We obtain an average value of NXB ??25% lower than that observed by the pn-CCDs on-board the XMM-Newton satellite, which is placed in a Highly Elliptical Orbit (HEO). We discuss this result in light of the differences between the L-2 and HEO space environments. |
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