XMM-Newton
Science Analysis System: User Guide
Next: 6.2.8 Further notes on processing of OM image data
Up: 6.2 Description of the OM image data processing chain omichain
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6.2.7 Deep detection on mosaiced images
Since SAS v9.0 it is possible to run omdetect on mosaiced images.
Invoking omichain with the parameter processmosaicedimages will
produce a second detection on mosaiced images (if any). New detected sources
will be added to the source list. This is the default in SAS v13.0.
- omdetect (step16). A second detection is done in the mosaiced
and stacked images (if any). This produces a new source list.
- ommag (step17). Calibration is applied to the sources of the
new list.
- omqualitymap (step18). Quality flags are set for the sources.
- omsrclistcomb (step19). The sources obtained from the mosaiced
and stacked images are merged as in step14.
- ommergelists (step20). The new sources detected in the
mosaiced and stacked images are added to the original combined list. Existing
sources from the first run of omdetect in the original images are
not changed.
This deeper detection can be applied manually to co-added or mosaiced images
from different observations. Since these new sources are very faint the
coincidence loss correction is not applied to them.
(See SAS on-line documentation for further details)
Next: 6.2.8 Further notes on processing of OM image data
Up: 6.2 Description of the OM image data processing chain omichain
Previous: 6.2.6 Source variability: omvariability
European Space Agency - XMM-Newton Science Operations Centre