IRAC Instrument Handbook - IRSA - California Institute of Technology

IRAC Instrument Handbook
Please note that Figure 7.11 to Figure 7.14 were made with no outlier rejection. A dithered observation,
combined with outlier rejection, will have much reduced stray light. Further, a diligent data analyst who
recognizes and masks stray light in the individual BCDs will be able to eliminate stray light from wellplanned
mosaics. Observations made with little or no redundancy, or with dithers on scales smaller than
the size of the stray light patches, will contain stray light and should be used with caution.
Figure 7.14: Channel 4 i mages showing scattered light from a scattering strip around the edge of the array
where a bright star is located. The scattered light patches are pointed to by black arrows. The images were
taken from program PID 30 data.
Data Features and Artifacts 124 Optical Artifacts