Jason Hunt (Toronto) was in town today to discuss things dynamical. We discussed various things. I described to him the MySpace project in which Price-Whelan (Princeton) and I are trying to make a data-driven classification of kinematic structures in the thin disk. He described a project in which he is trying to build consistent dynamical models of these structures. He finds that there is no trivial explanation of all the visible structure; probably multiple things are at work. But his models do look very similar to the data qualitatively, so it sure is promising.
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