The radiation environment in L-2 orbit: implications on the non-X-ray background of the eROSITA pn-CCD cameras

Details The radiation environment in L-2 orbit: implications on the non-X-ray background of the eROSITA pn-CCD cameras The radiation environment in L-2 orbit: implications on the non-X-ray background of the eROSITA pn-CCD cameras

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012exa....33...39p&link_type=abstract

Experimental Astronomy, Volume 33, Issue 1, pp.39-53

Astronomy and Astrophysics

Astrophysics

X-Ray Astrophysics, Instrumentation, Ccd, Particle Background

Scientific paper

The pn-CCD cameras at the focal plane of the eROSITA space observatory will be the first X-ray (0.2-12 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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