XMM-Newton Science Analysis System


omichain (omichain-1.74.10) [xmmsas_20230412_1735-21.0.0]

Checking the output

When the omichain has finished processing the odf, it will list the product files that have been created (product image, source-list and tracking-history files (all those beginning with P0). It is a good idea to do some checking of the output and the following are recommended:

• Use ds9 to view each product image and display the detected sources on the image by selecting the corresponding region file. It may be found that some faint sources have not been detected, in which case it may be worthwhile to re-process the data using the parameter omdetectnsigma set to 1, or run the task omsource to manually select sources.

• Use fv to inspect each product source-list file.

• Create a region file from the combined source-list file using the task slconv, and then use ds9 to view a mosaiced image and display the sources by selecting the region file.

• Look at the tracking-history plot file. Bad tracking may effect the astrometry and photometry.