A chunk of the PHAT team—Dalcanton (UW), Fouesneau (UW), Gordon (STScI), Weisz (UW)—arrived today to talk about stellar SED fitting and propagation of uncertainties therein to quantities and studies of interest. (For those of you who do not read and remember absolutely everything I write here, the PHAT project is a Dalcanton-PI six-band imaging survey over a large fraction of the M31 disk to create a catalog of tens of millions of stars and do a lot of the science you can do with that.) Today we made plans for the week-long sprint, which appear to be to use the outputs of SED fitting for every star on a big parameter grid and inputs from a model of the stellar population in a cluster, plus some crazy integration, to build a marginalized likelihood for the cluster parameters. Now everyone is coding like crazy. I think we surprised ourselves when we decided we would work in IDL and not Python. Crazy, but pragmatic.
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