Comments (3)
Thanks for posting this, @julienguy. Just planting a seed: I've had great success implementing (with Vivienne's help) a second-pass of sky-subtraction using PCA to mitigate these kinds of issues (see http://adsabs.harvard.edu/abs/2010arXiv1010.2500W) in AGES (another fiber redshift survey using the MMT/Hectospec instrument). Obviously here we're trying to introduce these effects for better realism, but we should also keep this in mind for when we start taking data.
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Should the random sky leakage fraction be the same in each camera for a given fiber?
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In reality, it won't be random, following mostly a radial pattern so that it will be a similar radial variation for each "petal" of the focal plane and hence similar for each camera.
Images showing this effect (in ideal conditions, and it won't be the case)
- light on screen
- portion of screen seen by a central fiber
- portion of screen seen by a fiber at the edge of fov (1.6 deg)
- non uniformity pattern (relative to sky)
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