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XMM-Newton Science Analysis System


omichain (omichain-1.50) [xmmsas_20070708_1801-7.1.0]

Meta Index / Home Page / OPERATION

Production of the combined source-list

Finally, when all the data for each filter has been processed, omsrclistcomb runs to combine the source lists from separate exposures into a single master list, to compute source fluxes, standard and AB magnitudes, and to set source flags. As for omatt, if a USNO catalogue fits file is available, and the parameter omsrclistcombusecat is set to true then it will also correct the astrometry (using the combined source-list) for any offset between the OM and USNO RA and dec axes, adding the columns RA_CORR and DEC_CORR to the combined source-list.

Figure 1 shows the overall operation of the omichain and Figure 2 the operation of the tracking-history and imaging pipeline, respectively.