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legacysurvey / legacypipe

Image reduction pipeline for the DESI Legacy Imaging Surveys, using the Tractor framework
BSD 3-Clause "New" or "Revised" License
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Allow galaxy color gradients #27

Closed djschlegel closed 4 years ago

djschlegel commented 9 years ago

The galaxy models are the same shape parameters in all filters, which does not allow for color gradients. We could capture color gradients by allowing the bulge and disk fluxes (for composite galaxies) to freely float relative to one another. This would probably be dangerous to do with something like the DR1 reductions, where these effects are likely small when compared to the remaining systematics in the PSF mis-estimation.

moustakas commented 4 years ago

May be done as part of a dedicated analysis of large galaxies (e.g., https://github.com/moustakas/LSLGA) but won't be done here.