XMM-Newton Science Analysis System


omqualitymap (omqualitymap-1.5) [xmmsas_20230412_1735-21.0.0]

Setting source quality-flag pixels using the QUALITY image

The algorithm works as follows

Loop through all the sources in the source-list and for each one:

1. Convert the source RA and Dec to x and y image coordinates using the WCS keywords in the FITS header of the image file.
2. Loop from bitnumber=0 to bitnumber=10
   • Using the x and y coordinates, check to see if bit bitnumber of the nine quality-image pixels in the box centred on the source are set- if so set bit bitnumber of the source quality-flag.