XMM-Newton Science Analysis System


ommosaic (ommosaic-2.7.1) [xmmsas_20141104_1833-14.0.0]

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Future developments

• Whilst tests have so far shown that scattered-light features do not effect the cross-correlation algorithm, further testing is underway and the method should be used with caution.
• Tests using the cross-algorithm on aspect-corrected sky-images have so-far shown the computed offsets to be small (less than 0.2 pixels). If both the aspect-correction and the cross-correlation algorithm were perfect, they should be zero. However the error in the aspect-correction can be up to 1 arc sec, and further testing needs to be done to evaluate any differences.
• It would be desireable to perform a further aspect correction on the sky-images- this would require either a new OM task or, possibly, a modification to omsrclistcomb. Note that even if the sky-images have not been aspect-corrected, the coordinates of the sources in the observation source-list file may have.