Some people of a certain age will know what it means when you say that MySpace is dead. But the statement is wrong! Today Jason Hunt (Flatiron) rebooted an old project by Price-Whelan and mine called MySpace. The motivation for our reboot: The upcoming ESA Gaia EDR3.
The idea is to figure out how the velocity-space structure (the moving groups, as it were) in the local disk varies with position, with a data-driven model, and then interpret the variations with position in terms of dynamical properties of the Milky Way. Hunt's innovation is to apply this same procedure to simulations as well as data, and use the output to classify the velocity substructure (classify as in: Does it come from resonances or disrupting clusters or what?). We discussed some of the math and optimization involved. Because we phrase this as the fitting of an expansion.
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