XMM-Newton Science Analysis System


eslewchain (eslewchain-1.20.1) [xmmsas_20230412_1735-21.0.0]

Interpreting the results

Slew data is particularly susceptible to problems caused by background flares, low-energy noise and halos around bright sources. For a practical guide of the issues to be aware of when interpreting slew data please see Saxton et al. 2008, A&A 480, 611.

A diagnostic file, P"obsid"PNS003UNFDAT8"nnn".ds, where "nnn" is the subimage number, is produced for each sub image position. This is an unfiltered image, containing events with all energies, all patterns and all flags. In this image, problems due to low-energy noise and optical loading can readily be seen. It is worth checking this image for problems before interpreting interesting features in the scientific images.