XMM-Newton Users Handbook


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Next: 3.4.5 Operating Modes of the RGS Up: 3.4.4.8 RGS photon pile-up Previous: 3.4.4.8.2 Pile-up mitigation

3.4.4.8.3 Pile-up assessment

Since pile-up most often results in the combination of two first-order events to become a single apparent second order event, a useful technique to assess its importance is the comparison of first and second order fluxed spectra. In the absence of pile-up, the effective area calibration ensures that first and second order fluxes at a given wavelength agree within a few percent. Hence, examining the ratio between first and second order can help determine whether pile-up has played a role.

Details about pile-up in RGS and the relevant methods for the assessment and management of this effect are given in the XMM-SOC Technical Note XMM-SOC-CAL-TN-0075, available from
http://xmm2.esac.esa.int/docs/documents/.



European Space Agency - XMM-Newton Science Operations Centre