NYU undergraduate David Mykytyn has been helping Lang and I get the Tractor working on big galaxies, with the thought that we could model big galaxies with the same machinery that we are using to model small ones (and by big I mean angularly big). He got everything working in record time but the model is so simple that it is having trouble dealing with all the real-world craziness at the centers of real, huge galaxies (think dust lanes etc). This on the path to a new Atlas.
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