r1 - 03 Aug 2005 - 15:13:00 - SteveWarrenYou are here: TWiki >  UKIDSS Web  >  SciVer > CrossTalk
Be aware that currently (SV1 stage) there is no correction either for cross talk images are persistence images in the pipeline. A bright star may cause a persistence image in subsequent images (rapidly decaying). Cross talk manifests itself as a spurious image in a channel adjacent to a channel containing a bright star. The cross-talk image appears as the spatial differential of the original image. Therefore typically it is an odd-even image, as in the example below.

  • crosstalk2.jpg:
    crosstalk2.jpg

If the bright star is saturated however, its image is flat-topped in the centre, so the differential is zero in that part. This gives rise to ring or washer-shaped images. An example is given below. The chances are you can identify them as they should have class=-2 (a star has class=-1).

  • crosstalk1.jpg:
    crosstalk1.jpg

-- SteveWarren - 03 Aug 2005

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