modeling stellar photometry

Fadely came up for the day to work on his project with Willman and me to model the spectral energy distributions of stars and galaxies in deep, multi-epoch surveys. The idea is to go fully hierarchical, which has not been done before (to our knowledge), and to use the results to perform both engineering tasks (like star–galaxy separation and target selection) and science tasks (like provide statistics on stellar populations, substructure, and so on). We discussed nuts and bolts in the morning, and Fadely wrote code in the afternoon. Foreman-Mackey joined in in the afternoon, and we pair-coded and discussed a robust calibration model for the SDSS Stripe 82 data, where we are definitely reinventing a whole bunch of wheels.

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