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Knowledgebase: IRAC
I see weird image artifacts in my IRAC data, including horizontal and vertical wings around bright sources, and some unreal looking fuzzy light patches. What are these and how can I get rid of them?
Posted by Seppo Laine on 21 November 2008 12:04 PM
Please take a look at the Data Features page and the IRAC Instrument Handbook which explain what these features are and shows example images. The pipeline tries to mitigate some of these artifacts, but the correction is not always perfect. The artifact-corrected files are the *cbcd.fits files. If you are not happy with the pipeline-corrected data, you can go back to the *bcd.fits files and perform your own artifact correction. If your data were well dithered, and you have sufficient redundancy, at least some of these artifacts should go away when mosaicking your data together.