XMM-Newton Science Analysis System


omdetect (omdetect-5.41) [xmmsas_20230412_1735-21.0.0]

Summary of the algorithm for IMAGING mode data

The following summarizes the way the program works for IMAGING mode data. More details of several of the processes mentioned are given later on. FAST mode data is processed in a simpler fashion- the extended-source algorithms are not used.

1. Load the image
2. Load the pixel quality map image
3. Create a background image
4. Run initial point-source detection algorithm
5. Look for “smoke” rings
6. Look for scattered-light features, and mask-out the pixels of any that are found.
7. Look for largish extended sources
8. Look for smaller extended sources
9. Look for faint sources
10. Compute the photometry of the point-like sources
11. Check for faint point-sources near much brighter sources, and delete if necessary.
12. If any largish extended sources have been found re-compute the background image
13. Compute the photometry of the extended sources
14. Check for faint extended-sources near much brighter sources, and delete if necessary.
15. Set the source-flags
16. Create the source-list file